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Psyllid captures continue to decline
Potato All Locations
potato psyllids
Posted on: September 16, 2016 by Erik Wenninger
Potato psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Owyhee (1 field), Canyon (9 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (8 fields), Jerome (5 fields), Minidoka (2 fields), and Cassia (7 fields). Additionally, from one field in Gooding County, we captured 4 adults in a vacuum sample and 2 nymphs in a leaf sample.
This week, we collected 548 psyllids from sticky cards (254 from Light sites and 294 from Intense sites). Of the total 552 psyllids captured this week, 198 came from the Treasure Valley. We found psyllids in 38 of the 51 fields (75%) that were sampled this week. Total captures are declining in part because sampling has ceased in many fields (due to vine kill or harvest) and likely also because of cooler weather.
We ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 50% of samples remain to be tested, and we expect to have those Lso results early next week. As always, the online spreadsheets (see below) may be updated at any time during the week as more data are gathered.
We continue to urge growers to maintain their IPM programs, especially in late-maturing fields, and to be on the lookout for plants exhibiting ZC symptoms. Foliar symptoms need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Psyllid numbers tick down slightly
Potato All Locations
potato psyllids
Posted on: September 9, 2016 by Erik Wenninger
Potato psyllids were collected this week on sticky traps in potato in the following counties: Payette (1 field), Owyhee (5 fields), Canyon (9 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (9 fields), Jerome (7 fields), Blaine (1 field), Minidoka (6 fields), Cassia (5 fields), and Bingham (1 field). Additionally, potato psyllid nymphs (37 total) were captured on leaf samples from Canyon County (2 fields) and Ada County (2 fields), and 30 potato psyllid adults were captured in vacuum samples taken from two Intense fields in Canyon counties.
This week, we collected 1,116 psyllids from sticky cards (824 from Light sites and 292 from Intense sites). Of the total 1,116 psyllids captured this week, 674 came from the Treasure Valley. We found psyllids in 40 of the 49 fields (82%) that were sampled this week. To put these numbers into perspective, we captured a total of approximately 1,100 psyllids for the entire year during each of the 2013 and 2015 seasons.
With the recent increase in psyllid numbers and attrition of our summer help, we ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 50% of samples remain to be test, and we expect to have those Lso results early next week. As always, the online spreadsheets (see below) may be updated at any time during the week as more data are gathered.
Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following infection, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Canyon & Owyhee County Conservation District Tour
All Crops Treasure Valley
Posted on: September 9, 2016 by Bill Buhrig
An opportunity to learn more about no-till planting, cover crops as forage, and free range chickens (wait, chickens?) are but a few of the topics available to interested folks on a tour being offered on September 22nd. This free tour is sponsored by the Canyon and Owyhee Conservation Districts, NRCS and the Lower Boise Watershed Council and will originate from the USDA office in Marsing @ 9:00AM sharp. Local farmers will be showing their work on the aforementioned topics and how they pertain to improving water quality and soil health. It promises to be a good time and they will feed you lunch at the tour conclusion for free! The gang does ask that you RSVP to Lori @ 208-454-8684 x126 by September 19th. Check out the attached flier.
September 2, 2016 – Psyllid numbers continue to rise
Potato All Locations
potato psyllids
Posted on: September 2, 2016 by Amy Carroll
The two fields in western Idaho that were reported two weeks ago to exhibit high incidence of ZC symptoms were found to be negative for ZC after molecular testing. Stem-end discoloration appears to be prevalent this year, and that might explain the misdiagnosis by field personnel. The symptomatic plants observed by Kimberly R&E Center staff did test positive for ZC, so we do have confirmed ZC at least in the Magic Valley.
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (8 fields), Jerome (9 fields), Blaine (1 field), Minidoka (3 fields), Cassia (5 fields), and Power (1 field).. Additionally, potato psyllid nymphs (9 total) were captured on leaf samples from Ada County (2 fields) and Jerome County (1 field), and 24 potato psyllid adults were captured in vacuum samples taken from three Intense fields in Canyon and Gooding counties.
This week, we collected 1,539 psyllids from sticky cards (1,138 from Light sites and 401 from Intense sites). Of the total 1,563 psyllids captured this week, 1,382 came from the Treasure Valley. We found psyllids in 54 of the 82 fields (66%) that were sampled this week. To put these numbers into perspective, we captured a total of approximately 1,100 psyllids for the entire year during each of the 2013 and 2015 seasons.
With the recent increase in psyllid numbers and attrition of our summer help, we ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 50% of samples remain to be test, and we expect to have those Lso results early next week.
Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following infection, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://www.uidaho.edu/extension/news/psyllid-management
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Harvest and Minimizing Foreign Material in Potatoes: On-line educational videos now available.
Potato All Locations
Posted on: August 30, 2016 by Nora Olsen
Harvest and Minimizing Foreign Material: On-line educational videos now available.
Foreign material is any material that is not the potato tuber. It is "trash" or "garbage" in potatoes. Many foreign materials originate in the field, but others enter the product stream through equipment and during storage and handling. Whether potatoes are destined for the fresh market or processing, foreign material is a great concern to the Idaho potato industry. By minimizing foreign material in the field, in storage, and in the processing plant, growers and processors help maintain a high-quality product, safe standards, and consumer confidence.
The video “Continuing to Manage Foreign Material for Quality Idaho Potatoes” outlines ways you can reduce unwanted or foreign material in your potatoes. The video (English and Spanish version) are available on-line at:
Spanish edition:
https://vimeo.com/144655993
English edition:
https://vimeo.com/144567198
Additional information “Managing Foreign Material for Quality Idaho Potatoes” is available at http://www.uidaho.edu/cals/potatoes/research/storage/potato-storage-management.
» http://www.uidaho.edu/cals/potatoes/research/storage/potato-storage-management.
Powdery Mildew Control for Grapes
Grapes All Locations
Powdery Mildew in grapes.
Posted on: August 30, 2016 by Rich Guggenheim
Powdery Mildew is being seen on grapes. The time to control this fungus is early in spring. See attached links or contact your local University of Idaho Extension Office for more information.
» http://ipm.ucanr.edu/PMG/r302100311.html
» http://articles.extension.org/pages/31529/powdery-mildew-of-grapes
» http://pnwhandbooks.org/plantdisease/grape-vitis-spp-powdery-mildew
» https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/em9067.pdf
Apply First Application of Fall Lawn Fertilizer Now.
Landscape and Garden All Locations
Turfgrass lawns
Posted on: August 29, 2016 by Rich Guggenheim
It is time to aerate and apply fertilizer to your lawn. Application should be
at 1 lb N per 1,000 sq ft. Unless lawns are very weak, avoid early-spring
applications since grass normally grows vigorously by itself at that time.
» http://web.cals.uidaho.edu/idahogardens/2012/08/when-to-apply-fertilizer-to-turfgrass/
» http://extension.colostate.edu/topic-areas/yard-garden/lawn-care-7-202/
» https://catalog.extension.oregonstate.edu/sites/catalog/files/project/pdf/ec1278.pdf
Psyllid numbers remain high
Potato All Locations
potato psyllids
Posted on: August 26, 2016 by Erik Wenninger
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (1 field), Gooding (2 fields), Twin Falls (7 fields), Jerome (6 fields), Minidoka (2 fields), and Cassia (4 fields). Additionally, potato psyllid nymphs (8 total) were captured on leaf samples from Ada County (2 fields) and Canyon County (1 field), and 42 potato psyllid adults were captured in vacuum samples taken from four Intense fields in Canyon and Ada counties.
This week, we collected 957 psyllids from sticky cards (727 from Light sites and 230 from Intense sites). Of the total 999 psyllids captured this week, 950 came from the Treasure Valley. We found psyllids in 46 of the 99 fields (46%) that were sampled this week. To put these numbers into perspective, we captured a total of approximately 1,100 psyllids for the entire year during each of the 2013 and 2015 seasons.
With the recent increase in psyllid numbers and attrition of our summer help, we ran Lso testing on a subset of psyllids collected last week (up to ten psyllids per site). So far, none of the psyllids tested last week was positive for Lso. About 25% of samples remain to be test, and we expect to have those Lso results early next week.
We scouted a few fields in the Magic Valley that have had Lso-positive psyllids this year and found no evidence of zebra chip in the plants that we sampled. This is encouraging. However, because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following infection, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
ZC found in Magic Valley
Potato All Locations
Posted on: August 24, 2016 by Erik Wenninger
A potato field in the Magic Valley was found to have potato plants exhibiting classic ZC symptoms in both the tubers and foliage. Tubers are being sent for confirmation by moleculr testing. Given that we have now found ZC in both the Treasure and Magic Valleys and have been capturing relatively high numbers of potato psyllids this season, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms
Photos of typical ZC symptoms exhibited by foliage and tubers may be found in this alert as well as at the link below. Be aware that symptoms in tubers may not be show through the entire tuber or in all tubers under a single plant.
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Consult our website for more information, including management recommendations and online spreadsheets that show details of the psyllid captures in potato fields over the season. Updates to these spreadsheets may occur throughout the week as liberibacter testing results come in.
http://www.uidaho.edu/extension/news/psyllid-management
» http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/30058/pnw633.pdf
Onion Variety Day at the Malheur Experiment Station
Onion Treasure Valley
Posted on: August 22, 2016 by Bill Buhrig
The annual Onion Variety Day at the Malheur Experiment Station will be Tuesday, August 30th. It is free to attend and you are invited to check things out. The field portion starts at 9am and there will be lunch starting at noon in the barn. It will be a good time to see how the varieties performed and visit with your neighbors!
August 19, 2016 – First incidence of ZC in Idaho during 2016; psyllid numbers still high
Potato All Locations
potato psyllids
Posted on: August 19, 2016 by Amy Carroll
At least two fields in western Idaho were found to exhibit a high incidence of severe ZC symptoms in tubers. The incidence is estimated to be upwards of 60%. Samples are on their way to campus for confirmation of ZC by molecular testing. Unfortunately, these fields were not part of our psyllid monitoring network; however, this development supports the need to maintain an IPM program targeting psyllids through the end of the season.
Only one potato psyllid collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field).
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (2 fields), Gooding (2 fields), Twin Falls (5 fields), Jerome (3 fields), Minidoka (2 fields), and Cassia (4 fields). Additionally, potato psyllid nymphs (22 total) were captured on leaf samples from Ada County (2 fields) and Canyon County (2 fields), with 38 potato psyllid adults being captured from vacuum samples taken from four Intense fields in the following counties: Canyon, Ada, and Gooding.
We collected 690 psyllids this week from sticky cards (556 from Light sites and 134 from Intense sites). Of the total 728 psyllids captured this week, 643 came from the Treasure Valley. We found psyllids in 43 of the 83 fields (52%) that were sampled this week. We had several cards from sites that did not come in this week, but will be processed when they hopefully arrive next week.
Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://www.uidaho.edu/extension/news/psyllid-management
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
August 12, 2016 – Psyllid numbers fall compared to recent weeks
Potato All Locations
potato psyllids
Posted on: August 12, 2016 by Amy Carroll
Only three potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Canyon (1 field) and Gooding (1 field). One nymph collected from a leaf sample on an Intense field in Canyon County tested positive.
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (1 field), Elmore (2 fields), Gooding (3 fields), Twin Falls (6 fields), Jerome (2 fields), Minidoka (2 fields), and Cassia (1 field). Additionally, potato psyllid nymphs (3 total) were captured on leaf samples from Ada County (1 field) and Jerome County (1 field), with two potato psyllids being captured from a vacuum sample taken from one Intense field in Canyon County.
We collected 260 psyllids this week from sticky cards (190 from Light sites and 70 from Intense sites). Of the total 262 psyllids captured this week, 233 came from the Treasure Valley. We found psyllids in 39 of the 97 fields (40%) that were sampled this week.
Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://www.uidaho.edu/extension/news/psyllid-management
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Corn Earworm moth counts for August 10
Corn Treasure Valley
corn earworm
Posted on: August 10, 2016 by Jerry Neufeld
Below is the final corn earworm count for this year. There didn’t seem to be a lot of corn earworm this year. That is what I have found for the last couple of years. I would appreciate hearing from you if you had a different experience.
Dry Lake 4
Kuna 1
Melba 10
Homedale 14
Wilder 8
Parma 2
Caldwell 0
total 39
Cercospora Leaf Spot and Black Bean Aphid in Sugarbeets
Sugarbeets All Locations
Cercospora Leaf Spot and Black Bean Aphid
Posted on: August 8, 2016 by Jerry Neufeld
AMSCO Pathologist Dr. Oliver Neher is reporting that Cercospora leaf spot has been confirmed in sugarbeet fields in the Wendell and Rupert areas. The recent weather conditions have been favorable for disease development. According to the 2016 PNW Plant Disease Handbook, “High humidity or free moisture and high temperatures (77°F to 95°F days, nights above 60°F) favor infection”. Many of the currently grown high-yielding sugarbeet varieties are susceptible or moderately susceptible to Cercospora. The 2016 PNW Plant Disease Handbook lists several fungicides that can be applied to treat this disease. Click on the link below for this information. The other link below directs to an extension bulletin published by the North Dakota State University and contains additional information for disease management. Dr. Neher is also reporting that black bean aphid is being found in these areas. You may be able to tank mix insecticides for black bean aphid with fungicides used for Cercospora. Contact your crop consultant from Amalgamated Sugar Company for more information.
» http://pnwhandbooks.org/plantdisease/sugar-beet-beta-vulgaris-cercospora-leaf-spot
August 5, 2016 – Positive psyllids in Payette, Canyon, and Ada counties
Potato All Locations
potato psyllids
Posted on: August 5, 2016 by Amy Carroll
Several potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field), Canyon (7 fields), and Ada (1 field). This is fewer than the previous two weeks.
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (2 fields), Gooding (1 field), Twin Falls (4 fields), Jerome (6 fields), Minidoka (3 fields), Cassia (4 fields), Power (3 fields), and Bingham (1 field). Additionally, potato psyllid nymphs (26 total) were captured on leaf samples from Ada County (2 fields) and Canyon County (2 fields), with three potato psyllids being captured from a vacuum sample taken from one Intense field in Canyon County.
We collected 379 psyllids this week from sticky cards (263 from Light sites and 116 from Intense sites). Of the total 379 psyllids captured this week, 308 came from the Treasure Valley. We found psyllids in 48 of the 101 fields (48%) that were sampled this week.
Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://www.uidaho.edu/extension/news/psyllid-management
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Corn Smut
Landscape and Garden All Locations
Corn Smut (Ustilago maydis)
Posted on: August 5, 2016 by Rich Guggenheim
Corn Smut has been spotted on sweet corn in gardens.
Corn Smut is edible.
There are no chemical controls for infected plants. Control is limited to a few cultural practices. Remove and dispose of smut galls before they rupture and release the black sooty spores. Remove and destroy all plant debris in the fall and practice crop rotation the following year. Avoid plant injury during cultivation, as this promotes disease development.
» http://sweetcorn.illinois.edu/Common-smut/Recipes.htm
» http://www.extension.umn.edu/garden/yard-garden/vegetables/corn-smut/
» http://www.apsnet.org/edcenter/intropp/lessons/fungi/Basidiomycetes/Pages/CornSmut.aspx
Powdery Mildew on Cucurbit crops
Landscape and Garden All Locations
Powdery Mildew
Posted on: August 5, 2016 by Rich Guggenheim
Powdery Mildew has been spotted on cucurbit crops. Applications of fungicides are preventative, not curative. Best management practices include:
Plant in a sunny location wherever possible
Make sure there’s good air circulation (through plant spacing and pruning)
Promote steady growth with moderate application of nitrogen fertilizer (or use a time release fertilizer)
In a sunny dry location, an occasional spray of water can be used to wash the PM from the plant
Remove and discard infected material, take special care in the fall to reduce the amount material available for over wintering
» https://www.mastergardeners.org/publications/powderyMildew.html
» http://ipm.ucanr.edu/PMG/r116100711.html
» http://vegetablemdonline.ppath.cornell.edu/factsheets/Cucurbits_PM.htm
» http://articles.extension.org/pages/30604/managing-cucurbit-powdery-mildew-organically
Corn Earworm counts for August 4
Corn Treasure Valley
corn earworm
Posted on: August 4, 2016 by Jerry Neufeld
Here are the corn earworm moth counts from this morning. The greatest number of moths were trapped in the Homedale area. Still, the numbers are fairly low. According to a Purdue Extension publication entitled CORN INSECT CONTROL RECOMMENDATIONS – 2016, “control is only economically justified on seed, sweet, or popcorn. Treat if 10 or more moths for several consecutive nights are captured in an earworm pheromone trap just before or during silking.” You may want to scout cornfields, especially n the Homedale area, for this pest.
Dry Lake 5
Kuna 6
Melba 7
Homedale 27
Wilder 5
Parma 3
Caldwell 1
total 54
Grassy Weed Control in Turf
Landscape and Garden All Locations
Grassy weeds in lawn
Posted on: August 4, 2016 by Rich Guggenheim
Weeds of various types in turf and laws are being brought in for identification and control. Proper control will require identification of the weed, a service provided for free by your local University of Idaho Extension Office.
Non chemical control methods including mowing your lawn as high as practical for your turf variety- usually 3-4 inches, deep watering of your lawn, proper fertilization usually in the fall, and core aeration can be very effective at aiding in control of weeds in your lawn.
» http://ipm.ucanr.edu/PMG/WEEDS/goosegrass.html
» https://njaes.rutgers.edu/pubs/e233/
» http://extension.colostate.edu/topic-areas/yard-garden/lawn-care-7-202/
July 29, 2016 – More Lso-positive psyllids found in Treasure and Magic Valleys
Potato All Locations
potato psyllids
Posted on: July 29, 2016 by Amy Carroll
Last week we reported on a sharp increase in the prevalence of Lso-positive psyllids relative to the previous weeks this season. Out of an abundance of caution to avoid reporting any false positives, we re-tested a subset of those positive psyllids and we stand by our original results. The sites during Week 9 with putative positive psyllids that we had labelled as “pending” are now labelled as “positive.”
In addition, several potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field), Owyhee (1 field), Canyon (6 fields), Twin Falls (2 fields), Minidoka (2 fields), and Cassia (1 field). Furthermore, two potato psyllid nymphs collected from leaf samples from a field in Ada County tested positive for Lso.
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (2 fields), Twin Falls (8 fields), Jerome (2 fields), Cassia (2 fields), and Power (1). Additionally, potato psyllid nymphs were captured on leaf samples from 2 fields in Ada County, and two potato psyllids were captured from vacuum samples taken from Intense fields in Canyon and Ada County.
We collected 361 psyllids this week from sticky cards (246 from Light sites and 115 from Intense sites). Of the total 363 psyllids captured this week, 335 came from the Treasure Valley. We found psyllids in 40 of the 101 fields (40%) that were sampled this week.
Because of the recent prevalence of Lso and the relatively high numbers of potato psyllids that we have been collecting each week, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://www.uidaho.edu/extension/news/psyllid-management
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Cicada Killer (Sphecius grandis)
Landscape and Garden All Locations
Cicada Killer (Sphecius grandis)
Posted on: July 29, 2016 by Rich Guggenheim
Cicada Killers are being brought into local Extension Offices. Cicada killers are very large wasps, ranging 3-5 cm in length and resemble a very large yellowjacket wasp. Control of cicada killers is rarely recommended and can be difficult to achieve. The insects are not aggressive and have a beneficial role in managing cicada populations.
» https://bspm.agsci.colostate.edu/files/2013/03/Cicada-Killers.pdf
» https://utahpests.usu.edu/schoolIPM/htm/pest-id-guide/stinging-insects/sand-wasps-cicada-killer
Wasps, Hornets, and YellowJackets
Landscape and Garden All Locations
Wasps, hornets, and yellowjackets
Posted on: July 29, 2016 by Rich Guggenheim
Wasps, hornets, and Yellowjackets are being seen in numerous yards and gardens this year.
Different methods, including non-chemical are available. Click the links below for more information.
» https://www.cals.uidaho.edu/edcomm/pdf/CIS/CIS1218.pdf
» http://extension.uidaho.edu/clearwater/files/2014/11/Homeowner-Guide-to-Minor-Stinging-Insects2.pdf
» http://extension.colostate.edu/topic-areas/insects/nuisance-wasps-and-bees-5-525/
Corn Earworm moth counts for July 27
Corn Treasure Valley
corn earworm
Posted on: July 27, 2016 by Jerry Neufeld
I am still not seeing much in the way of corn earworm moths. Below is the count that was taken this morning.
Location 7/27
Dry Lake 1
Kuna 0
Melba 4
Homedale 2
Wilder 2
Parma 2
Caldwell 0
Total 11
Increase in Lso-positive psyllids in Treasure and Magic Valleys
Potato All Locations
potato psyllids
Posted on: July 22, 2016 by Erik Wenninger
Numerous potato psyllids collected last week tested positive for Lso (liberibacter), the bacterium that causes zebra chip. Lso-positive psyllids were found in the following counties: Payette (1 field), Owyhee (1 field), Canyon (4 fields), Twin Falls (3 fields), and Jerome (1 field).
This represents a sharp increase in the prevalence of Lso-positive psyllids relative to the previous weeks this season. We are quite certain that these results are accurate; however, out of an abundance of caution to avoid reporting any false positives, we are in the process of retesting several samples that did not show as strong a positive result as others. Those sites collected during Week 9 that we believe to be positive but are being retested are marked on the spreadsheet (links provided below) as “pending” in the “% Lso+ psyllids” column. We expect to update these data next week when results from the additional tests come in. We collected psyllids that we believe to be positive but that currently have a status of Lso “pending” in the following counties: Payette (2 fields), Owyhee (2 fields), Canyon (2 fields), Ada (1 field), and Jerome (1 field).
Regardless, there clearly has been an increase in the prevalence of Lso-positive psyllids as well as relatively high numbers of psyllids overall. Therefore, we urge growers to maintain their IPM programs targeting psyllids and to be on the lookout for plants exhibiting ZC symptoms over the coming weeks. Foliar symptoms should be manifested about three weeks following inoculation, but will need to be confirmed by examining and testing tubers. See link below for description and photos of ZC symptoms, and please take suspicious plant samples to the Kimberly R&E Center or to your local UI Extension Center.
Potato psyllids were collected this week on sticky traps in potato in the following counties: Malheur (OR) (1 field), Payette (3 fields), Owyhee (5 fields), Canyon (13 fields), Ada (2 fields), Elmore (1 field), Twin Falls (2 fields), Jerome (3 fields), Gooding (1 field), Minidoka (2 fields), and Cassia (6 fields).
We collected 245 psyllids this week from sticky cards (179 from Light sites and 66 from Intense sites). Two potato psyllids were collected in a vacuum sample on an Intense site in Canyon County, and four nymphs were found on leaf samples from an Intense site in Ada County. Of the total 247 psyllids captured this week, 152 came from the Treasure Valley. We found psyllids in 38 of the 103 fields (37%) that were sampled this week.
More information and resources on potato psyllids and ZC, including management, scouting recommendations, and ZC symptomology can be found at the links below.
http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
Detailed results from the “Light” sites can be found here:
https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
Detailed results from the “Intense” sites can be found here:
https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
» http://oregonstate.edu/dept/hermiston/sites/default/files/pnw633_0.pdf
» https://docs.google.com/spreadsheets/d/1EruNcKgfqJ0RUpleaHBpODfwBZIqDyT4l-9MPKZBYcY/edit#gid=0
» https://docs.google.com/spreadsheets/d/1Uk6GBxEgZeGWWhT84wymaWfHRs2it_Eg02eWPFLgWsI/edit#gid=0
Corn Earworm counts for July 22
Corn Treasure Valley
corn earworm
Posted on: July 22, 2016 by Jerry Neufeld
A few corn earworm moths (adults) are starting to show up in the traps I set out earlier this week. Although, the numbers are low. Below are the moth counts from this morning, July 22.
Dry Lake 0
Kuna 1
Melba 4
Homedale 4
Wilder 1
Parma 0
Caldwell 1
11
I am not aware of treatment thresholds for this pest in Idaho, however, the following excerpt was taken from an Extension Publication from Purdue University.
Management Guidelines
Corn Insect Control Recommendations: E-series 219-W
For seed production fields, if 10 or more moths are captured in a pheromone trap for several consecutive nights, economic damage is possible. However, only fields silking and/or pollinating during this time are candidates for treatment.
You may want to step up your field scouting and work closely with your crop consultant to determine if a treatment is necessary.
