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Lygus Bug in Alfalfa Seed - 2022
Alfalfa Seed Treasure Valley, Treasure Valley - Idaho, Northern Idaho
lygus
Posted on: May 16, 2022 by Jerry Neufeld
The western tarnished plant bug (Lygus hesperus) degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition shows that, depending on your location in the Treasure Valley, we have accumulated 240 growing degree days between January 1, 2022 and May 16, 2022. Peak emergence of lygus bug 1st and 2nd instar nymphs occurs around 277 accumulated growing degree days. Using the predicted degree day model, peak emergence is predicted to occur on approximately May 22. We suggest growers monitor for lygus bugs in alfalfa seed fields starting very soon.
When using insecticides, fields should be treated when the numbers of lygus bugs reach a management threshold of 4-5 lygus bug nymphs per 180-degree sweep. Follow all insecticide labels and recommendations, including targeting the correct life stage.
The link below will take you to the PNW Insect Management Handbook for lygus.
» https://pnwhandbooks.org/insect/legume-grass-field-seed/alfalfa/alfalfa-seed-lygus-bug
Lygus Bug - Alfalfa Seed 2020
Alfalfa Seed Treasure Valley
lygus bug
Posted on: May 4, 2020 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition shows that, depending on your location in the Treasure Valley, we have accumulated 242 growing degree days between January 1, 2020 and May 4, 2020. This is 6 days ahead of 2019, and 4 days ahead of the 30-year average. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated growing degree days; this will occur around May 8, and is the time monitoring for lygus bugs in alfalfa seed fields should begin.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected.
Below are the instructions for using the degree day calculator.
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “Select model” link to the right of the Model box. It should be model 61 in the list.
3) The predicted date for the 275 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output.”
Also, below is the link to the “alfalfa seed-lygus bug” page in the PNW Insect Management Handbook.
» https://pnwhandbooks.org/insect/legume-grass-field-seed/alfalfa/alfalfa-seed-lygus-bug
lygus bug-alfalfa seed, 2019
Alfalfa Seed Treasure Valley
lygus bug
Posted on: May 2, 2019 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition shows that, depending on your location in the Treasure Valley, we have accumulated 175 degree days between January 1, 2019 and May 2, 2019. This is 5 days behind 2018, and the same as the 30-year average. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days; this will occur around May 15, and is the time monitoring for lygus bugs in alfalfa seed fields should begin.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected.
Below are the instructions for using the degree day calculator.
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “Select model” link to the right of the Model box. It should be model 61 in the list.
3) The predicted date for the 275 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output”
Also, below are the links to the “alfalfa seed-lygus bug” page in the PNW Insect Management Handbook, and the Assail label on the Idaho State Department of Agriculture website.
» https://pnwhandbooks.org/insect/legume-grass-field-seed/alfalfa/alfalfa-seed-lygus-bug
» https://agri.idaho.gov/main/56-2/pesticides/product-registration-2/pesticide-label-search/
Predicted Lygus emergence
Alfalfa Seed Treasure Valley
Lygus bug
Posted on: April 7, 2017 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition shows that, depending on your location in the Treasure Valley, we have accumulated 78 degree days between January 1, 2017 and April 6, 2017. This is 8 days behind compared to this date in 2016 and 7 days ahead of the 30-year average. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur about May 15.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected. We will plan to put out another alert in early May, but you can monitor degree day accumulation using the link provided below as follows:
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “model params” drop down box.
3) The predicted date for the 272 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output”
The link below will take you to the growing degree day model.
Thanks for Dr. Jim Barbour for this information.
Lygus Emergence in Alfalfa Seed
Alfalfa Seed Treasure Valley
lygus bug
Posted on: April 19, 2016 by Jerry Neufeld
Thanks to Dr. Jim Barbour, IPM Specialist at the University of Idaho, SW Idaho Research and Extension Center (Parma) for providing this information about Lygus emergence in alfalfa seed.
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated 137 degree days between January 1, 2016 and April 19, 2016. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now peak emergence is predicted to occur about the first week of May ( ~May 5). This is about 8 days ahead of the 30 year average.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Select the location nearest you by selecting the appropriate pin in the map at the top of the page. The above data are for the Parma location. Results likely will vary depending on the location selected.
2) Select “insects” in the category drop down box under the map, then select the “Lygus bug [alfalfa seed] Ben Simko 2000” model from the “model Parma” drop down box.
3) The predicted date for the 275 degree day accumulation for peak 1st and 2nd instar lygus nymphs will be listed in the “DDs Event” text box. You also can view the full model output by selecting the button labeled “Click here to CALC/ RUN model w/daily output.”
lygus bug
Alfalfa Seed Treasure Valley
lygus bug
Posted on: April 29, 2014 by Jerry Neufeld
The following information is being provided by Dr. Jim Barbour, IPM Specialist and Superintendent at the SW Idaho Research and Extension Center at Parma.
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated 161 degree days between January 1, 2014 and April 28, 2014. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur about the second week of May ( ~May 13).
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Assail, or Beleaf, as stand-alone sprays probably should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Selecting “ lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the “Select degree day model….” drop down box at the top of the form
2) In the “Select location” box, select a location in the drop down box best describing your location in the “Washington, Idaho” (e.g. “Parma id agmet” box if you want information for a field near Parma; Idaho; Idaho locations are at the bottom of the very long list). Make sure to select “None” at the top of the lists in the other two location boxes.
3) Leave the “Or upload your own weather data…” box blank
4) In the “Forecast:”, enter your zip code or your city, state in the “NWS zip code/city, state” box, or the location nearest your field from the “or weather.com site” drop down box to the right). This selection forecasts 7 days forward based on the local weather forecast (beyond 7 days the forecast is based on the historical average). The predicted date of peak 1st and 2nd instar will vary depending on the forecast location selected, so pick the one closest to your location. Select “none” to have the forecast based only on the historical average.
5) Select the location nearest your field in the “Select historical average forecast location” area. Your selection here should match, as close as possible, your selection in the “Select location” area above: there may not be an exact match. For Idaho and eastern OR, this will be the middle box. As above, select “none” in the other two boxes.
6) Make sure the “Table” and “graph” boxes are checked (and the “precipitation” if you want rainfall information) and click the “Calc” button. A table with the current degree day accumulations matching your selection should appear. There should also be a graph near the bottom showing the current year accumulation compared to the historical average for your selections.
Additional updates will be posted as the 272 degree day accumulation target approaches.
lygus bug
Alfalfa Seed Treasure Valley - Idaho
lygus
Posted on: May 4, 2012 by Jerry Neufeld
The following information was provided by Dr. Jim Barbour, IPM Specialist at the UI Parma R and E Center.
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated about 230 days since January 1, 2012. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this varies year-to-year, but usually occurs around mid-May, and is the time to begin monitoring for lygus bugs in alfalfa seed fields. In the Treasure Valley that is predicted to occur between May 10 and May 14, depending on your location.
You can monitor degree day accumulation using the link provided above and:
1) Select “ lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the “Select degree day model….” drop down box at the top of the form: the lower and upper temperature threshold boxes (52 and 130 degrees F) and the start and end date boxes (Jan 1 and Aug 31) should automatically fill.
2) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “parma id agrimet” in the “Washington, Idaho” box if you want information for a field near Parma). Make sure “None” is selected in the boxes for the other two locations.
3) Leave the “Or upload your own…” box blank
4) In the “Forecast:” area, enter the zip code or your city and state in the “NWS zip code/city, state” box, or the location nearest your field from the “or weather.com site” drop down box to the right). This selection forecasts 7 days forward based on the local weather forecast (beyond 7 days the forecast is based on the historical average). The predicted date of peak 1st and 2nd instar will vary depending on the forecast location selected, so pick the one closest to your location. Select “none” to have the forecast based only on the historical average.
5) Select the location nearest your field in the “Select historical average forecast location” area. Your selection here should match, as close as possible, your selection in the “Select location” area above: there may not be an exact match. As above, select “none” in the other two boxes.
6) Make sure the “Table” and “Graph” boxes are checked (and the “Include precipitation…” if you want rainfall information) and click the “Calc” button. A table with the current degree day accumulations matching your selection should appear. There should also be a graph near the bottom showing the current year accumulation compared to the historical average for your selections.
lygus in alfalfa seed
Alfalfa Seed Treasure Valley - Idaho
lygus bug
Posted on: May 18, 2010 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated about 227 degree days since January 1, 2010. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur on about May 27 in the Caldwell area.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Rimon, Assail, or Beleaf, as stand-alone sprays should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Select “ lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the “Select degree day model….” drop down box at the top of the form
2) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “parma id agrimet” in the “Washington, Idaho” box if you want information for a field near Parma). Make sure to select “None” at the top of the lists in the other two location boxes.
3) Leave the “Or upload your own…” box blank
4) In the “Forecast:” area, enter the your zip code or your city, state in the “NWS zipcode/city, state” box, or the location nearest your field from the “or weather.com site” drop down box to the right). This selection forecasts 7 days forward based on the local weather forecast (beyond 7 days the forecast is based on the historical average). The predicted date of peak 1st and 2nd instar will vary depending on the forecast location selected, so pick the one closest to your location. Select “none” to have the forecast based only on the historical average.
5) Select the location nearest your field in the “Select historical average forecast location” area. Your selection here should match, as close as possible, your selection in the “Select location” area above: there may not be an exact match. As above, select “none” in the other two boxes.
6) Make sure the “Table” and “graph” boxes are checked (and the “precipitation” if you want rainfall information) and click the “Calc” button. A table with the current degree day accumulations matching your selection should appear. There should also be a graph near the bottom showing the current year accumulation compared to the historical average for your selections.
Thanks to Dr. Jim Barbour for providing this information.
lygus in alfalfa seed
Alfalfa Seed Treasure Valley - Idaho
lygus bug
Posted on: May 5, 2010 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that, depending on your location in the Treasure Valley, we have accumulated 178 degree days since January 1, 2010. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 272 accumulated degree days: this usually, but not always, occurs around mid-May, and is the time monitoring for lygus bugs in alfalfa seed fields should begin. Right now that is predicted to occur on about May 19.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Rimon, Assail, or Beleaf, as stand-alone sprays should treat before 4th instar nymphs are detected. You can monitor degree day accumulation using the link provided above as follows:
1) Select “ lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the “Select degree day model….” drop down box at the top of the form
2) In the “Select location” box, select a location in the drop down box best describing your location (e.g. “parma id agrimet” in the “Washington, Idaho” box if you want information for a field near Parma). Make sure to select “None” at the top of the lists in the other two location boxes.
3) Leave the “Or upload your own…” box blank
4) In the “Forecast:” area, enter the your zip code or your city, state in the “NWS zipcode/city, state” box, or the location nearest your field from the “or weather.com site” drop down box to the right). This selection forecasts 7 days forward based on the local weather forecast (beyond 7 days the forecast is based on the historical average). The predicted date of peak 1st and 2nd instar will vary depending on the forecast location selected, so pick the one closest to your location. Select “none” to have the forecast based only on the historical average.
Thanks to Dr. Jim Barbour for providing this information.
Lygus
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 30, 2007 by Jerry Neufeld
Right now the lygus degree day model is predicting that the 1st and 2nd instar lygus populations will peak May 6. Since we are expecting a cool down by mid-weak this may get pushed back some, but you should be getting ready to check seed fields for lygus and other early season pests. Unless you are treating with Rimon alone, you should consider treating if Lygus populations exceed 4 to 5 per sweep. If you are treating with Rimon alone you should treat before large numbers of large lygus nymphs appear. If you have 8 to 10 nabids (damsel bugs) plus geocoris (bigeyed bugs) per sweep, which is not likely this time of year, you may not need to treat. Treatment recommendations (other than Rimon) can be found in the Pacific Northwest Insect Management handbook (online at: http://pnwpest.org/pnw/insects ). We have some fields in the area that show resistance to bifenthrin (Capture/Discipline, etc.), so be sure to rotate chemistries to minimize resistance problems. In fields that have bifentrin resistance problems, bifentrin will tend to work best early season.
lygus bug
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 23, 2007 by Jerry Neufeld
The Lygus degree day calculator hosted by Integrated Plant Protection Center at Oregon State University and the IPM Centers - PNW Coalition (http://pnwpest.org/cgi-bin/ddmodel.pl?spp=lyg) shows that we have accumulated about 160 growing degree days (GDD) since January 1, 2007. Peak emergence of lygus bug 1st and 2nd instar nymphs should occur right around 275 accumulated GDD. This usually, but not always, occurs around mid-May and is the time monitoring for lygus bugs in alfalfa seed fields should begin. The model is currently predicting we will hit 275 approximately May 6. In 2006, we hit 275 GDD on May 15, so we are currently running about 9 days ahead of last year.
When using most insecticides, fields should be treated when numbers of lygus bugs reach 4-5 lygus bug nymphs per 180 degree sweep. Growers using Rimon as a stand-alone spray should treat as soon as early instar nymphs are detected. You can monitor degree day accumulation using the link provided above and selecting:
1) The” lygus bug [alfalfa seed]Ben Simko 2000” degree day model from the drop down box at the top of the form
2) None in the ‘Oregon, Canada, Alaska” and “Montana, Wyoming” location boxes
3) “Parma ID Agrmt” in the “Washington ,Wyoming” location box
4) “Caldwel ID” from the “Forecast”…“weather.com” drop down box
5) The defaults for the other boxes should work fine: just be sure that the start date is January 1, 2007 and the ending date covers the time you are interested in forecasting.
6) Finally, click the “Calc” near the bottom of the form. The degree day accumulation to date plus the forecast extending to whatever ending date you selected will appear in a new window. I will provide additional updates as the 275 degree day accumulation approaches.
Provided by Dr. Jim Barbour from the UI Parma Research and Extension Center.
Cutworms in Alfalfa Seed
Alfalfa Seed Treasure Valley - Idaho
Posted on: March 26, 2007 by Jerry Neufeld
Brad Chambers from Pioneer Hi-Bred is reporting that with the warmer weather he is starting to see an increase in cutworm activity in newly planted alfalfa seed fields. Cutworms are being found mostly in fall seeded stands.
Alfalfa Seed Crop Insurance
Alfalfa Seed Treasure Valley - Idaho
Posted on: August 28, 2006 by Jerry Neufeld
The Federal Crop Insurance Corporation Risk Management Agency Alfalfa Seed Insurance Program has been expanded to Canyon County, ID with continuation in Owyhee County, ID and Malheur County, OR for the 2007 crop year. Sales closing date is September 30, 2006. More information can be found at the following web-sites: http://www3.rma.usda.gov/apps/docbrowser/docbrowserb.cfm, and http://www3.rma.usda.gov/apps/agents/. For more information call your local crop insurance agent or RMA regional office at (509)353-2147.
Rimon for lygus control
Alfalfa Seed Treasure Valley - Idaho
Posted on: June 1, 2006 by Jerry Neufeld
The following message was submitted by Dr. Jim Barbour from the U of I Parma Research and Extension Center.
Rimon® 0.83EC insecticide (novaluron; Chemtura Corp.), has received a section 24c approval for control of lygus bugs in alfalfa seed. Rimon is an insect growth regulator that controls insects by interfering with the molting process. As larvae or nymphs feed and begin to molt, the exoskeleton ruptures and the insect dies before reaching the next growth stage. Nymphs developing in eggs laid on Rimon residues are unable to hatch.
Rimon is easy on natural enemies of lygus bugs and other insect pests. It is also very easy on adult leafcutting bees. We do not yet have information on the effect of Rimon on alfalfa leafcutting bee larvae. Because of this selectivity Rimon looks like a good fit in an Integrated Management Program and may work well to keep lygus numbers low when applied during bloom.
Rimon has provided control of lygus in our field trials and has provided better seed yields than untreated control plots even when it didn’t appear to reduce lygus bug numbers. Here are a few guidelines for using Rimon.
• Scout the field so that you know the number and size of lygus bug nymphs present in your field.
• Applications of Rimon alone should only be made when low numbers of small (instars 1-3) are present in order to prevent lygus population from reaching damaging numbers, not to rapidly reduce damaging numbers of large lygus (instars 4 & 5 and adults).
• Because it is a growth regulator and slow acting, Rimon should not be used alone as a rescue treatment on fields with high numbers of large lygus nymphs and adults.
• When high numbers of adults and large nymphs are present, Rimon should be tank mixed with a traditional pesticide to lower numbers of larger instar lygus bugs and prevent development of eggs and small nymphs.
• Rimon may also control alfalfa weevil and caterpillars.
• Follow label directions. A copy of the label can be viewed or downloaded from ISDA using the following link:
http://www.agri.state.id.us/Categories/Pesticides/Documents/24c/Rimon%20on%20Alfalfa%20Grown%20for%20Seed.pdf
• I would recommend a minimum of 15 gallons per acre when ground applied even though the label allows a minimum of 5 gallons per acre.
Please let me know if you are using Rimon for lygus control this year. I would like to track the progress of fields treated with Rimon and get your input on the product.
Dr. Jim Barbour
email: jbarbour@uidaho.edu
phone: 208 722-6701
lygus bug
Alfalfa Seed Treasure Valley - Idaho
Posted on: May 12, 2006 by Jerry Neufeld
The current forecast is for the 1st and 2nd instar lygus number to peak on 16 May. Warm weather this weekend may move that up a bit. At any rate, next week would be a good time to start lygus monitoring activities. The threshold for lygus is 4-6 large lygus bugs (4th and 5th instars plus adults) per 180 degree sweep. Treatment options can be found in the printed or online (http://pnwpest.org/pnw/insects) editions of the PNW Insect Management Handbook.
lygus bug in alfalfa seed
Alfalfa Seed Treasure Valley - Idaho
Posted on: May 4, 2006 by Jerry Neufeld
The current forecast is for the 1st and 2nd instar lygus numbers to peak on 20 May. We are still running very close to average, but cooler weather forecast for next week may slow things down a bit.
Remember that the lygus degree day model indicates when peak populations of first generation 1st and 2nd instar nymphs should occur, not when treatment would be necessary. The degree day model is really useful as a tool to pinpoint early season sampling efforts. Treatment decisions should be made based on lygus thresholds and the presence of susceptible stages of alfalfa when grown for seed (the presence of flowers and flower buds that contribute to seed yield). So just because lygus bugs show up doesn't necessarily mean that they will need to be treated. It just means you should be on the lookout for potential problems. You should also be on the look out for other early season pests such as the pea leaf weevil and cutworms, especially in new seedings.
If you want to know more about degree days or to monitor degree days yourself, go to the "OSU On-Line Phenology and Degree Day" web page at: http://ippc2.orst.edu/cgi-bin/ddmodel.pl?spp=lyg. Select the lygus bug [alfalfa seed] Ben Simko 2000 model (or any other model you might be interested in) in the drop down box at the top of the page. Don't mess with the calculator mode settings, but do select the start and end dates and locations that are appropriate for you then hit the calculate button at the bottom of the page. You should get a print out of the degree day accumulations for the times selected and, at the bottom of the page, a graph of the data selected along with a graph showing the historical average for the same time.
This information was provided by Dr. Jim Barbour, Research Entomologist with the University of Idaho at the Parma R & E Center.
lygus bug in alfalfa seed
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 20, 2006 by Jerry Neufeld
Dr. Jim Barbour, Research Entomologist with the U of Idaho at the Parma R and E Center provided the following information about lygus bug in alfalfa seed.
Degree days, also known as heat units or thermal units are the accumulation of temperature over time. Usually degree-days are only counted above a lower temperature threshold and below an upper threshold. Degree-days are used in agriculture and natural resources management to predict events and time management activities, such as when to sample or control a pest problem. In alfalfa seed we can use degree day units to predict the occurrence of peak populations of 1st and 2nd instar lygus bugs hatching from eggs laid by overwintering adult lygus. This event takes right at 272 degree days. On average we reach 272 degree days about mid-May, but there is considerable year-to year variation. Right now we are sitting at 78 Degree Days. That's just about right on the historical average for this time of year and well below last year when we were at 177 degree days on this date (about the time it started raining and didn't stop for a month). The forecast is for the 1st and 2nd instar lygus number to peak on 21 May, but stay tuned for more information.
Remember that the lygus degree day model indicates when peak populations of first generation 1st and 2nd instar nymphs should occur, not when treatment would be necessary. The degree day model is really useful as a tool to pinpoint early season sampling efforts. Treatment decisions should be made based on lygus thresholds and the presence of susceptible stages of alfalfa when grown for seed (the presence of flowers and flower buds that contribute to seed yield). So, just because lygus bugs show up doesn't necessarily mean they need to be treated . It just means you should be on the lookout for potential problems. You should also be on the look out for other early season pests such as the pea leaf weevil and cutworms, especially in new seedings.
If you want to know more about degree days or to monitor degree days yourself, go to the "OSU On-Line Phenology and Degree Day" web page at: http://ippc2.orst.edu/cgi-bin/ddmodel.pl?spp=lyg. Select the lygus bug [alfalfa seed] Ben Simko 2000 model (or any other model you might be interested in) in the drop down box at the top of the page. Don't change the calculator mode settings, but do enter start and end dates and locations that are appropriate for you, then hit the calculate button at the bottom of the page. You should get a print out of the degree day accumulations for the times selected and, at the bottom of the page, a graph of the data selected along with a graph showing the historical average for the same time period.
Lygus
Alfalfa Seed Treasure Valley - Idaho
Posted on: May 13, 2005 by Jerry Neufeld
As of today, peak numbers of 1st and 2nd instar lygus are predicted to occur early next week (May 15). You can keep track of degree day accumulations using the OSU web site (http://ippc2.orst.edu/cgi-bin/ddmodel.pl?spp=lyg). Use degree day accumulations as a queue to start lygus scouting activities. Early season lygus threshold is 4-5 lygus nymphs or adults per 180 degree sweep.
Lygus
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 25, 2005 by Jerry Neufeld
Cool weather during March and April has slowed degree day accumulations to something approaching normal. Peak numbers of 1st and 2nd instar lygus are now predicted to occur during the 3rd week of May (May 17 as of this morning). You can keep track of degree day accumulations using the OSU web site (http://ippc2.orst.edu/cgi-bin/ddmodel.pl?spp=lyg). Use degree day accumulations as an indicator of when to start lygus scouting activities. The early season lygus threshold is 4-5 lygus nymphs or adults per 180 degree sweep.
Alfalfa and Clover Seed PMSP
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 13, 2005 by Jerry Neufeld
The Pest Management Strategic Plan for Western U.S. Alfalfa and Clover Seed Production has been completed and posted on the internet at http://pestdata.ncsu.edu/pmsp/index.cfm. The plan can also be accessed by going to AlfalfaSeed.org and clicking on “Offsite Links” followed by clicking on the “Alfalfa Seed Pest Management” link.
Alfalfa Seed Pests
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 12, 2005 by Jerry Neufeld
Brad Chambers from Pioneer Hi-Bred is reporting that cutworms and pea leaf weevils are starting to show up in new stands of alfalfa seed. Adult pea leaf weevils are grayish brown, slender weevils about 5 mm long, with a short snout. Adults chew notches out of alfalfa leaflet margins and sometimes can defoliate new seedling alfalfa causing serious stand loss. First reports of damage were in the Wilder area, but both pests have been found in the Nampa area also.
Lygus bug
Alfalfa Seed Treasure Valley - Idaho
Posted on: May 5, 2004 by Jerry Neufeld
According to the lygus bug degree day model we should be seeing peak numbers of 1st and 2nd instar lygus nymphs from the 1st generation lygus hatch right now. We are a full 10 -14 growing degree days ahead of average this year depending on your location. The 1st generation lygus hatch usually peaks in mid-May. Now is a good time to scout your fields and determine your treatment needs. With the continued heat insect growth will be rapidly proceeding. Check your fields at least once a week if possible, more if you are approaching the threshold of 4 lygus per sweep. Small instars (1, 2, & 3) are easier to control than large instars (4 & 5) or adults. Bigeyed bugs, damsel bugs and minute pirate bugs are also out early so watch for these beneficial insects. If the population of bigeyed bugs plus damsel bugs is twice the number of lygus bugs, and your lygus numbers are not increasing, you may not need to treat.
Lygus Bug in Alfalfa Seed
Alfalfa Seed Treasure Valley - Idaho
Posted on: April 14, 2004 by Jerry Neufeld
Jim Barbour from the U of I Parma Research and Extension Center is reporting that the warm weather this spring has resulted in rapid lygus bug development. He is already seeing a few 1st and 2nd instars in alfalfa seed at the Parma R & E Center. The Lygus Degree Day Model (http://ippc2.orst.edu/cgi-bin/ddmodel.pl?spp=lyg) is predicting peak 1st and 2nd instar lygus nymphs from 1st generation lygus near April 29. This is about two weeks earlier than usual (last year’s date was May 23) and could change if the weather cools. Set back operations should lower lygus bug populations a bit, but it’s a good idea to be on the lookout for them. Jim has seen some predators, nabid bugs, minute pirate bugs, and bigeyed bugs early as well.
cutworms
Alfalfa Seed Treasure Valley - Idaho
Posted on: March 10, 2004 by Jerry Neufeld
Cutworms have been found in fall planted alfalfa seed and mint fields south of Nampa. You may want to check your fields to determine whether or not you have these pests.
Lygus and Aphids
Alfalfa Seed Treasure Valley - Idaho
Posted on: May 16, 2003 by Jerry Neufeld
Mike Huff from Dairyland Seed is reporting that 1st and 2nd instar lygus have been found in alfalfa seed fields in the Homedale area. A few ahpids (~10-15 sweep) are also being found.
Onset of First Lygus Bug Hatch in Alfalfa Seed
Alfalfa Seed Treasure Valley - Idaho
Posted on: May 15, 2003 by Ben Simko
Lygus bug degree-day model, through May 13, indicates Ontario and Parma areas have accumulated 220 and 238 degree-day units respectively. Peak first hatch (1st & 2nd instars) is predicted at about 275 degree-days and the current forecast indicates peak hatch to occur on or near May 20-22. Temperature regimes experienced this spring compared to last year (2002) show similar hatch dates. In 2002 the peak hatch occurred around May 18. Jim Barbour and I have observed small nymphs
( mostly 1 and 2 instars) at the U of I Parma Experiment Station alfalfa seed test plots. Traces of floral buds are starting to also show in some established fields. View Lygus Reference Page to find links to degree day calculators, DD maps, and to get daily Lygus heat unit updates for Ontario, OR, Parma, Caldwell, and Boise, ID seed production areas.
Pea Leaf Weevil
Alfalfa Seed All Locations
Posted on: April 22, 2003 by Jerry Neufeld
Brad Chambers from Pioneer is reporting Pea Leaf Weevils are being found in spring seeded alfalfa seed fields. Insects have been found around Caldwell, Nampa, and Melba. Brad is reporting these insects have been around for a few weeks and he has seen stand reductions in fields with high populations. Pea Leaf Weevils feed on the cotyledons of the seedling after it emerges and then on older growth. Leaves with half circle notches in them should alert the grower that they are present (they can be confused with cut worm damage). 2003 Insect PNW is reporting there are no products registered for this pest.
cutworms in alfalfa seed
Alfalfa Seed All Locations
Posted on: March 21, 2003 by Jerry Neufeld
Cutworms are increasing in numbers in alfalfa seed fields throughout the Idaho portion of the Treasure Valley and also in the Nyssa/Adrian area of Malheur county. Populations in the Parma, Wilder, Homedale, Nampa and Melba areas have been on the increase over the last week. New alfalfa seedings small enough to be affected by this pest should be inspected and if necessary proper treatment should be applied to avoid serious stand reduction. Brad Chambers from Pioneer provided this information.
Onset of Lygus Hatch in Alfalfa Seed Observed
Alfalfa Seed none
Posted on: June 26, 2002 by Ben Simko
At the U of I, Parma Experiment Station, Jim Barbour and I are conducting alfalfa seed insecticide efficacy research using Capture + dimethoate as a standard “clean up” treatment as well as evaluating the performance of some newer chemistries. At the Monday, June 24th, 14 days post treatment sweep counts, we are detecting a big hatch of small 1-2 instar Lygus nymphs (20-30/sweep) in the station plots. The onset of this first bloom period hatch is confirmed in other areas by Lynelle Drake’s, Andrews Seed Co. scouting program. Growers and seed company fieldmen are advised to begin regular sweep sampling to survey fields for this hatch and begin planning for their bloom period insecticide treatments. Proper timing of these bloom sprays is critical to maximize control of Lygus infestations using our limited set of bloom insecticides.
spotted alfalfa aphid
Alfalfa Seed All Locations
Posted on: June 7, 2002 by Jerry Neufeld
Mike Huff from Dairyland Seed is reporting spotted alfalfa aphids in alfalfa seed field across the Treasure Valley. He is finding both winged and wingless aphids. Mike advises to keep this in mind as you apply clean up sprays.
Lygus Bug - First Hatch
Alfalfa Seed All Locations
Posted on: May 14, 2002 by Ben Simko
Lygus bug degree-day model, through May 13, indicates Ontario and Parma areas have accumulated 225 and 228 degree-day units respectively. Peak first hatch (1st & 2nd instars) is predicted at 275 degree-days and the current forecast indicates peak hatch to occur on or near May 19. Due to cooler weather experienced this spring the 2002 hatch in the Ontario area will be 6 days later than last year and in the Parma area 11 days later than 2001. Small nymphs are beginning to appear in fields in the Adrian, Big Bend, Nyssa, and Ontario areas. Traces of floral buds are starting to also show in established fields. View Lygus Reference Page to find links to degree day calculators, DD maps, and to get daily Lygus heat unit updates for Ontario, OR, Parma, Caldwell, and Boise, ID seed production areas.
Lygus Bug Hatch
Alfalfa Seed none
Posted on: June 25, 2001 by Ben Simko
A Lygus bug hatch was oberved in alfalfa seed fields near Cairo Junction, Ontario. These fields were treated with a clean up tank mix of Capture and dimethoate on June 4. The hatch is moderate size averaging 5-7 total nymphs per sweep. Third instar nymphal stage dominates the population as of sweep samples taken Sunday June 25. As residual control from clean up sprays wanes, growers and fieldmen are advised to check fields weekly or semi weekly to detect first bloom period hatches and schedule timely insecticide applications.
Alfalfa Weevil in Alfalfa Seed
Alfalfa Seed none
Posted on: May 23, 2001 by Jerry Neufeld
Tom Miles from ABI Alfalfa is reporting a hatch of alfalfa weevil larvae in established alfalfa seed fields. Problem is worst in the Kuna/Meridian areas.
Painted Lady (Thistle Butterfly) Outbreak
Alfalfa Seed none
Posted on: May 22, 2001 by Ben Simko
Everett Collord, seed agronomist with ABI, reports sporadic
infestations of painted lady or thistle butterfly
caterpillars damaging spring planted alfalfa seed fields.
Locations of these unusual pest outbreaks include fields north
of Wilder, ID, the stateline near the Big Bend area, OR, and
Sunset Valley, OR. Seed growers are advised to check new
seeded stands of alfalfa and treat if feeding damage warrants
control. Refer to the 2001 PNW Insect Management Handbook, Alfalfa Seed Section,
for products registered on the crop and which have lepidopertous pest efficacy.
Cutworms in Alfalfa Seed
Alfalfa Seed none
Posted on: May 10, 2001 by Jerry Neufeld
Cutworms have been found in a spring planted alfalfa seed field near Emmett on 5/8/01. Worms are 1/4 to 1/2 inch long. The field history for 2000 was beans.
Lygus Bug - First Hatch
Alfalfa Seed none
Posted on: May 1, 2001 by Ben Simko
Lygus bug degree-day model, through April 30, indicate Ontario and Parma have accumulated 172 and 225 degree-day units respectively. First hatch is predicted at 275 degree-days. View Lygus reference page to find links to degree day calculators and get daily updates for Ontario,OR, Parma, Caldwell, and Boise, ID seed production areas. (At DD model pages just scroll down and select calc button.)
