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Fruit Advisory
Tree Fruits Treasure Valley - Idaho
Posted on: June 11, 2009 by Tony McCammon
Codling moth models indicate 35% of Larvae have hatched out. This is the most critical time to protect your fruit as another 30% of first generation larvae will be hatching out this week. This weekend Peach, nectarine, and apricot trees should be protected from the Peach twig Borer. The weather forecasts rain showers off and on for the next week. Use rainfast product for your applications. For more information on Rainfast products, and additional information concerning this alert view the payette county Extension website and check out the June 11 advisory.
Tree Fruit Pest Advisory
Tree Fruits Treasure Valley - Idaho
Posted on: June 11, 2009 by Tony McCammon
The Attached Advisory contains Peach twig Borer, Peach tree borer, Codling Moth, White Leafhopper, and western Cherry fruitfly information for Commercial and Home orchardists. View the Payette County Extension Website
for further information.
Early blight resistance management
Potato All Locations
Posted on: June 11, 2009 by William H. Bohl
Early blight, caused by Alternaria solani, is a very common disease of potato found in most potato-growing areas in Idaho. Although it occurs annually to some degree in most production areas, the timing of its appearance and the rate of disease progress help determine the impact on the potato crop. Though losses rarely exceed 20 percent, if left uncontrolled, the disease can be very destructive. Since 1999, the persistent and intensive use of azoxystrobin and other QoI fungicides alternated with chlorothalonil on commercially grown potato crops in the Midwest and throughout the United States have increased the selection pressure for the development of QoI fungicide resistance in A. solani.
Learn more about what this may mean to you in the June Spudvine newsletter from University of Idaho http://extension.ag.uidaho.edu/bingham/Jun%202009.pdf
Herbicides in Teff
All Crops All Locations
Posted on: June 10, 2009 by Steve Norberg
Attention:
A pesticide use concern has been brought to our attention. Information on the use of herbicides in the production of Teff, specifically 2,4-D and dicamba, are not currently lawful for use. OSU and the Oregon Department of Agriculture, Pesticides Division, are currently working with U.S. EPA to clarify crop groups in reference to pesticide residue tolerances and labeled products. This is to correct an oversight found in “Teff- A New Warm Season Annual Grass in EM8970” and clarify that there are currently no 2,4-D or dicamba products registered for use in the production of Teff.
As additional information becomes available it will be shared with interested parties. If you have questions please feel free to contact me.
Steve Norberg
541-881-1417.
new onion disease
Onion Treasure Valley - Idaho
Posted on: June 10, 2009 by Jerry Neufeld
Lynn Jensen, Potato and Onion Specialist with OSU in Malheur County is reporting that an onion disease that is new to the Treasure Valley has been identified. It is onion smut. The field is in Malheur County and is spring planted onions. The following web site has more information about onion smut.
http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=758
cereal leaf beetle
Small Grains Treasure Valley - Idaho
Posted on: June 2, 2009 by Jerry Neufeld
Bob Hays from Idaho State Department of Agriculture is reporting that cereal leaf beetle populations are rapidly increasing in small grain fields in the Payette area.
Colorado Potato Beetles in Magic Valley
Potato Magic Valley
Posted on: June 1, 2009 by Nora Olsen and Jeff Miller
Overwintering Colorado Potato Beetle adults are beginning to emerge in southcentral Idaho-- both Eastern and Western Magic Valley. Confirmed areas include Rupert, Minidoka, and Twin Falls.
The overwintering adult stage does limited damage, however, females are beginning to lay eggs in potato fields. We could see the damaging larvae appear in about 7 to 10 days depending on temperatures. Growers that did not apply an effective systemic insecticide at planting should be watching for the egg hatch to time a foliar spray for the first generation of CPB larvae.
western Cherry Fruit Fly
Tree Fruits Treasure Valley - Idaho
Posted on: June 1, 2009 by Tony McCammon
To confirm the previous Alert. Cherry Fruit Flies have been caught in the sunnyslope area of Canyon County. Mature adults will be laying eggs by the 4th of June. Be prepared.
Western Cherry Fruit Fly, Fire Blight, Codling Moth
Tree Fruits Treasure Valley - Idaho
Posted on: June 1, 2009 by Tony McCammon
Current Warnings:
Codling Moth (apple worm): June 1-15
The peak egg hatch period has begun. It is a short window of time (between 1-2 weeks) where 15-80% of all eggs hatch and the surface area of each fruit expands. With the expansion of the fruit chemical sprays loose effectiveness quickly. During this rapid egg hatching and fruit expansion, it is important that your fruit is protected with insecticide to prevent larval entry. Keep track of when your first treatment was applied and how long it lasts. If it is waning during the period of peak egg hatch, consider applying your second application sooner (by 1-2 days).
Insecticides that target both larva and egg stages are recommended. Such as: Altacor, Assail, Calypso, and Intrepid. Homeowners should use horticulture oil with a product such as sevin for their first spray. The oil will smother unhatched eggs and the sevin will protect the fruit from hatched larva. Good residue coverage on your fruit is vital during the first generation. Growers should continue to apply the chosen material(s) at the interval provided on the label.
Fireblight: June 1-3
Fire Blight is forecasted for Monday through Friday of this week with a possibility of continued infection early next week. Infection is likely when trees have open flowers, had late season pruning, or open wounds and injured branches. For infection to occur at least two hours of moisture during 70 degree temperatures are necessary. Monitor moisture in your apples and pears. If the wetting occurs and flowers are open, apply an antibiotic such as serenade or agri-mycin. Homeowners can use blight ban or Mico-shield. If you do not choose to control fire blight at this time monitor very closely for new infections and prune them out. They usually show up within 7 to 14 days. For more information review the attached advisories.
Western Cherry Fruit Fly: June 4
The cherry maggot adults are flying and will have reached maturity on June 4th. Sprays need to be applied if fruit have turned a straw- yellow color. Cherry fruit fly CAN-NOT penetrate the skin and lay eggs on green fruit. Therefore, materials should be applied only after the first few fruits have developed a salmon blush color over the yellow.
Be sure to note the pre-harvest interval (PHI) of your material. (This is the time period you must wait after a spray to harvest your fruit.)
Chemicals to control Western Cherry Fruit fly:
Homeowner: spinosad (GF-120, Natural Guard Spinosad, every 7 days), Sevin (every 7 days), permethrins (every 7-14 days)
Commercial Grower: imidacloprid (Merit, Provado-every 14 days), phosmet (Imidan-every 14 days, but not on sweet cherry), chlorpyfros (Lorsban-every 14 days but not on sweet cherry), diazonon (every 14 days), spinosad (GF-120, Success), permethrins
For more information visit the Payette County Extension Office website. Also visit the new Orchard Review Board link on the website.
onion thrips
Onion Treasure Valley - Idaho
Posted on: June 1, 2009 by Jerry Neufeld
Dr. Mike Thornton, from the UI Parma Research and Extension Center, is reporting that the recent spike in temperatures has contributed to an increase in onion thrips populations in the onion fields near Parma. This small pest can cause direct plant damage when populations build to high levels, and also transmits the Iris Yellow Spot Virus (IYSV) to onions from overwintering sources. Past experience indicates that we normally start seeing symptoms of IYSV develop in local onion fields around mid-July to early August. It takes about 6 weeks after the plants become infected with IYSV for symptoms to develop, indicating that early to mid-June is a critical time for thrips control. This is a good time to start scouting onion fields for this pest.
Colorado Potato Beetle
Potato Treasure Valley - Idaho
Posted on: June 1, 2009 by Jerry Neufeld
Dr. Mike Thornton, from the UI Parma Research and Extension Center, is reporting that overwintering Colorado Potato Beetle adults are beginning to emerge in southwest Idaho. This overwintering adult stage does not do any damage, however, females are beginning to lay eggs in potato fields. We could see the damaging larvae appear in about 7 to 10 days depending on temperatures. Growers that did not apply an effective systemic insecticide at planting should be watching for the egg hatch to time a foliar spray for the first generation of CPB larvae.
» Colorado Potato Beetle Adult
» CPB eggs
More Fruit Advisory
Tree Fruits Treasure Valley - Idaho
Posted on: May 29, 2009 by Tony McCammon
Attached is an advisory for Updates on Codling moth Western Cherry Fruit Fly, Wooly apple aphid. Please advise others of these alert.
Western Cherry Fruit Fly
Tree Fruits Treasure Valley - Idaho
Posted on: May 28, 2009 by Tony McCammon
The Western Cherry Fruit Fly will be showing up in traps Monday or Tuesday of next week. Keep a look out. Information on the Western Cherry Fruit Fly and control methods are available on the Payette County Website (http://extension.ag.uidaho.edu/payette/fruit.htm).
The pdf files below, from Bem Simko at ISDA, contain additional information related to the Western Cherry Fruit Fly.
Western Cherry Fruit Fly
All Crops Treasure Valley - Idaho
Posted on: May 28, 2009 by Tony McCammon
The Western Cherry Fruit Fly will be showing up in traps Monday or Tuesday of next week. Keep a look out. Information on the Western Cherry Fruit Fly and control methods are available on the Payette County Website (http://extension.ag.uidaho.edu/payette/fruit.htm).
cereal leaf beetle
Small Grains Treasure Valley - Idaho
Posted on: May 27, 2009 by Jerry Neufeld
I received my second report of the day about grain fields with enough cereal leaf beetle larvae damage to warrant spraying. You may want to take another look at your grain fields, especially spring grains, to confirm the presence or absence of this pest.
Memorial Day Weekend
Tree Fruits Treasure Valley - Idaho
Posted on: May 21, 2009 by Tony McCammon
Cougar Blight models predict Fireblight extreme risk possibilities through Monday the 25th. Codling moth hatch is predicted to begin Friday the 22nd. Visit www.extension.ag.uidaho.edu/payette/ for more information. Have a safe weekend.
Codling Moth
All Crops Treasure Valley - Idaho
Posted on: May 18, 2009 by Tony McCammon
Codling moth models predict the apple worm larva will begin hatching out on the 22nd of May. Insecticides that target both larva and egg stages are recommended. Such as: Altacor, Assail, Calypso, and Intrepid. Homeowners should use horticulture oil with a product such as sevin for their first spray. The oil will smother unhatched eggs and the sevin will protect the fruit from hatched larva. Good Residue coverage on your fruit is vital during the first generation. So After this initial period, growers should continue to apply the chosen material(s) at the interval provided on the label. For more information visit the Payette County Extension Website at:
http://extension.ag.uidaho.edu/payette/fruit.htm
Protect yourself from Fire Blight
Tree Fruits Treasure Valley - Idaho
Posted on: May 18, 2009 by Tony McCammon
Fire Blight is forecasted for Monday through Friday of this week with a possibility of continued infection early next week. Infection is possible when trees have open flowers, had late season pruning, or open wounds and injured branches. For infection to occur at least two hours of moisture during 70 degree temperatures are necessary. Monitor moisture in your apples and pears. If the wetting occurs and flowers are open, apply an antibiotic such as serenade or agri-mycin. Homeowners can use blight ban or Mico-shield. If you do not choose to control fire blight at this time monitor very closely for new infections and prune them out. They usually show up within 7 to 14 days. For more information review the attached advisory.
Old advisories and additional information are available on my website at:
http://extension.ag.uidaho.edu/payette/fruit.htm
Cereal leaf beetle
Small Grains Magic Valley
Posted on: May 14, 2009 by Jeff Miller
Cereal leaf beetle have been found in wheat and barley near the desert east of Minidoka. See the May 12 posting for photos and a link to the University of Idaho CIS article.
upcoming OSU ag events
Announcements All Locations
Posted on: May 14, 2009 by Jerry Neufeld
Lynn Jensen from the OSU Malheur County Extension office is inviting interested growers and allied industry to attend three upcoming events: 1) Thrips Seminar, 2) Weed Research Tour, and 3) Malheur Experiment Station Field Day. The pdf below has all the times, dates, etc.
cereal leaf beetle
Small Grains Magic Valley
Posted on: May 12, 2009 by Jerry Neufeld
Kerry Bowen is reporting that many cereal leaf beetle are being found in the Declo area up against the mountains. Click on the pdf below for CLB control information from the 2009 Pacific Northwest Insect Management Handbook. The following link will take you to a University of Idaho publication with more information (including images)about the CLB: http://info.ag.uidaho.edu/Resources/PDFs/CIS0994.pdf.
Lygus bug in alfalfa seed
All Crops Treasure Valley - Idaho
Posted on: May 8, 2009 by Jerry Neufeld
The following information regarding lygus bug was provided by Dr. Jim Barbour from the University of Idaho, Parma R and E Center.
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 190 degree days since January 1, 2009. 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 19. As cool as it has been, we are ahead of last year by several days in degree-day accumulation.
When using most insecticides during pre-bloom, 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.
Alfalfa Weevil
Alfalfa Treasure Valley - Oregon
Posted on: May 6, 2009 by Steve Norberg
May 6, 2009 by Steve Norberg
Be sure to be scouting alfalfa weevil as numbers are increasing and I have seen fields with some damage.
Pest description and crop damage Larvae are about 0.375 inch long, yellow to green, with a white stripe down the back. They feed in and on the buds and leaves of alfalfa.
More information and control recommendations can be found at 2009 Pacific Northwest Insect Guide information on alfalfa weevil can be found at:
http://www.tvpestalert.net/admin_add.php
http://uspest.org/pdf/reb90.pdf
Alfalfa Weevil
All Crops Treasure Valley - Oregon
Posted on: May 6, 2009 by Steve Norberg
May 6, 2009 by Steve Norberg
Be sure to be scouting alfalfa weevil as numbers are increasing and I have seen fields with some damage.
Pest description and crop damage Larvae are about 0.375 inch long, yellow to green, with a white stripe down the back. They feed in and on the buds and leaves of alfalfa.
More information and control reccomendations can be found at 2009 Pacific Northwest Insect Guide information on alfalfa weevil can be found at:
http://www.tvpestalert.net/admin_add.php
http://uspest.org/pdf/reb90.pdf
Alfalfa Weevil
All Crops Treasure Valley - Oregon
Posted on: May 5, 2009 by Steve Norberg
Be scouting alfalfa weevil as numbers are increasing and I have seen fields with some damage.
Pest description and crop damage Larvae are about 0.375 inch long, yellow to green, with a white stripe down the back. They feed in and on the buds and leaves of alfalfa.
Sampling and thresholds
Treat when—
1. Thirty percent of plant terminals show feeding damage. Either cut and then treat stubble or treat the standing crop, depending on how close to cutting it is.
2. Damage is noticeable 1 week or more before estimated cutting time, and larvae exceed 10 per 90°-sweep, sometimes called a straight-line sweep).
3. Larvae number 20 or more per sweep (180° sweep, sometimes called a half-circle sweep). Thresholds based on larvae per sweep are a general guideline; weather, plant vigor, irrigation schedules, cutting date, history of weevils in the area, and a complex of other factors may determine whether treatment is warranted.
Management—chemical control
Most of these insecticides are hazardous to bees and should not be applied if bees are actively foraging in the alfalfa.
1. carbaryl at 1 to 1.5 lb ai/a. PHI 7 days for grazing or cutting. REI 12 hr. If pretreatment damage is extensive, cut alfalfa and treat the stubble for alfalfa weevil larvae. This product is not effective against adult alfalfa weevils. Do not apply more than once per cutting. Carbaryl may burn or yellow hay under some conditions, and applying to wet foliage or during high humidity may injure tender foliage. Latex-based formulations, such as Sevin XLR Plus, are less hazardous to bees.
2. carbofuran (Furadan 4F) at 0.25 to 1 lb ai/a for larvae and 0.5 to 1 lb ai/a for adults. PHI for grazing or cutting is 7 days at the 0.25 lb ai/a rate, 14 days at 0.5 lb ai/a, and 28 days at 1 lb ai/a. REI 48 hr. Do not apply more than once per season and apply only to pure stands. Do not move bees into alfalfa fields within 7 days of application. Do not apply near waterfowl nesting and feeding areas.
3. chlorpyrifos (Lorsban 4E) at 0.5 to 1 lb ai/a. PHI for grazing or cutting is 14 days at 0.5 lb ai/a or 21 days above 0.5 lb ai/a. REI 24 hr. Do not apply more than four times per season or reapply within 10 days of an earlier application. Minor phytotoxicity possible on young, tender, rapidly growing plants.
4. cyfluthrin (Baythroid 2) at 0.025 to 0.044 lb ai/a. PHI 7 days for grazing or cutting. REI 12 hr. Do not exceed 0.05 lb ai/a per cutting or 0.2 lb ai/a total per season.
5. dimethoate at 0.25 to 0.5 lb ai/a. PHI 10 days for grazing or cutting. REI 48 hr. For suppression only. Do not apply during bloom or exceed one application per cutting.
6. gamma-cyhalothrin (Proaxis) at 0.01 to 0.015 lb ai/a. PHI 1 day for forage harvest or 7 days for hay harvest. REI 24 hr. Do not exceed 0.015 lb ai/a per cutting or 0.06 lb ai/a per season. Do not apply within 25 ft of an aquatic habitat, 150 ft if applied by air, or 450 ft if applied by ULV.
7. indoxacarb (Steward) at 0.065 to 0.11 lb ai/a. PHI 7 days for cutting. REI 12 hr. Do not exceed one application per cutting or 0.44 lb ai/a total per season. Not for seed alfalfa.
8. lambda-cyhalothrin (Warrior) at 0.02 to 0.03 lb ai/a. PHI 1 day for forage harvest or 7 days for hay harvest. REI 24 hr. Apply only to pure stands and avoid applications when bees are actively foraging. Do not exceed 0.03 lb ai/a per cutting or 0.12 lb ai/a per season. Do not apply within 25 ft of an aquatic habitat, 150 ft if applied by air, or 450 ft if applied by ULV.
9. malathion 5 EC at 0.75 to 1 lb ai/a. PHI 0 days. REI 12 hr. For alfalfa weevil larvae only. Not effective below 65°F.
10. methomyl (Lannate LV) at 0.9 lb ai/a. PHI 0 days, 7 days for grazing or cutting. REI 48 hr. For alfalfa weevil larvae only. Do not exceed 10 applications per season or 3.6 lb ai/a total in one season.
11. permethrin at 0.1 to 0.2 lb ai/a. PHI 0 days at 0.1 lb ai/a or less, 14 days at more than 0.1 lb ai/a. REI 12 hr. Do not exceed 0.2 lb ai/a per cutting.
12. phosmet (Imidan 70-W) at 0.7 to 0.93 lb ai/a. PHI 7 days for grazing or cutting. REI 5 days. Do not apply more than once per cutting or apply during bloom. Do not use latex- or pineolene-based adjuvants.
13. zeta-cypermethrin (Mustang) at 0.028 to 0.05 lb ai/a. PHI 3 days for grazing or cutting. REI 12 hr. Wait at least 7 days to reapply. Do not exceed 0.05 lb ai/a per cutting or 0.15 lb ai/a per season. Do not apply within 25 ft of an aquatic habitat or 150 ft if applied by air.
