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corn earworm
Corn Treasure Valley - Idaho
Posted on: July 13, 2007 by Jerry Neufeld
The University of Idaho CIS 366 entitled “Timing Corn Earworm Control,”states that summer moths will begin laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD). Egg hatch and larvae attack will begin about 73 GDD later.
According to the Oregon State University GDD model for Corn Earworm (http://pnwpest.org), we are currently at 1189 GDD in the Caldwell area, 1107 GDD in the Nampa area and 1185 GDD in the Parma area. We are accumulating approximately 28 GDD per day. We will hit 1300 GDD in the Caldwell and Parma areas around July 17, and hit 1300 GDD in the Nampa area around July 21. Those fields silking at 1300 GDD are most vulnerable to attack from corn earworm larvae.
The following information was taken from CIS 366 regarding corn earworm.
Corn can be “scouted” for corn earworm eggs to predict possible infestation levels. Examine 10 silk masses (about 2-day old) on each edge of a field but only in those fields which are beginning to silk or are silking. Examining a field in late silk for the first time is worthless; most of the eggs, if any were present, are already hatched, and the damage cannot be prevented.
When the egg counts average 1 per 2 masses, about 100% ear infestation will occur in the field and other fields of like maturity in the vicinity. With 1 egg per 2 silk masses, about 1 inch of each ear tip will be damaged; 1 egg per silk mass will result in about 2 inches of the ear tip damage, etc. When the days and nights are warmer than usual, the damage may double because the earworm will develop faster than the corn.
Fields should be scouted about every 2 to 4 days, depending on temperatures. Once economic egg levels are reached, determined on the basis of damage expected, further scouting is unnecessary. All fields which silk after that time in that vicinity will be subject to damage.
No chemical control will control worms in the ears, so sprays must be timed to control the larvae on the silk before the worms enter the ears. Make the first application when the plants are 50 percent silk, and repeat in 5 to 7 days or as necessary.
Iris Yellow Spot Virus
Onion Treasure Valley - Idaho
Posted on: July 13, 2007 by Jerry Neufeld
Lynn Jensen from the Oregon State University, Malheur County Cooperative Extension Office is reporting that Iris Yellow Spot Virus has been identified in onion fields in the Fruitland/New Plymouth and Ontario, Oregon areas. There are currently no known fungicide treatment options for this virus. The virus is transmitted by onion thrips. Growers should keep their fields as stress free as possible by keeping thrips populations in check and by maintaining good irrigation practices.
Green peach aphids
Potato Magic Valley
Posted on: July 10, 2007 by Jeff Miller
A report was received today from a consultant that green peach aphids were seen in a couple of potato fields. Now would be a good time to intensify the scouting of fields. The best place to look is at the edge of fields on nightshade plants.
Spotted alfalfa aphid
Alfalfa Magic Valley
Posted on: July 10, 2007 by Dale Baker
Glenn Shewmaker has reported a sighting of spotted alfalfa aphid in the Mini-Cassia area. Growers need to scout carefully. This species can kill seedling stands and decrease yields in established fields.
Malheur Exp. Sta. Field Day July 11
Announcements Treasure Valley - Oregon
Posted on: July 9, 2007 by Clint Shock
We would like to invite you to the Malheur Experiment Station Field Day, July 11th, 2007
8:30 - 9:00 Registration
9:00 - 10:30
Tour A: Weed Control or
Tour B: Drip Irrigation, “Permanent” Drip Irrigation, and Wildflower Seed Production
10:30 - 12:00
Tour C: Onion Production
Tour D: Cereal Tour
12:00 - 1:00 Lunch
Program on Russian Knapweed, Joel Felix and Gary Page (Malheur County Weed Inspector)
1:15-2:30
Tour E: Saving Electricity: Operating Motors Efficiently on Single-Phase Power
RSVP to Jan Jones at (541) 889-2174 or Janet.Jones@oregonstate.edu
More information see http://www.cropinfo.net/events.htm
assail 24c label
All Crops Treasure Valley - Idaho
Posted on: July 3, 2007 by Jerry Neufeld
Assail 70WP (acetomiprid) has received a 24c (special local needs) registration for lygus bugs in alfalfa seed. The material is moderately effective (population suppression) on lygus and has potential as a tank is partner in cleanup or bloom sprays when lygus pressure is heavy, or as a standalone spray when lygus pressure is light and sweep counts consist largely of 1st to 3rd instars. Assail is relatively soft on parasites and predators, and safe to leaf cutting bees when applied in the evenings after the bees have stopped foraging. Assail has good activity on aphids.
small grains field tour
Small Grains Treasure Valley - Idaho
Posted on: June 27, 2007 by Jerry Neufeld
You are cordially invited to the 2007 Parma Small Grain Tour at the Parma R & E Center, 29603 U of I Lane, Parma, ID on July 6, 2007. The registration for the tour begins at 9 am and the tour starts at 9:30 am. Registration and loading will be in the grassed area on the east side of the road. A box lunch will be served at the conclusion of the tour by noon.
The tour will feature:
• Soft white, hard white, and hard red winter and spring wheat varieties
• Winter and spring barley varieties
• Nitrogen fertilization trials involving soil applied slow release nitrogen on hard red spring wheat and soft white winter wheat, and foliar N fertilizer comparisons with hard white spring wheat.
• Late season N for improving waxy barley protein
• Stripe rust incidence
• Update on IWC, IBC, or IGPA.
• General discussion on other small grain topics of interest
Contact Dr. Brad Brown at 722-6701 ext 216 if you have any questions.
powdery mildew in sugarbeets
Sugarbeets All Locations
Posted on: June 27, 2007 by Jerry Neufeld
The Amalgamated Sugar Company Field Representatives are saying that now is the time to plan your treatments for powdery mildew in sugarbeets. While mildew has not yet been found in the Treasure Valley, White Satin Field staff say the modes of action of the mildew chemistries work best if treatments are applied before mildew is found in the field. They are recommending mildew applications in the west end of the Treasure Valley by July 4, and applications in the east end of the Treasure Valley (Ada/Canyon County line) no later than July 10. Treatments should be made by these dates regardless of whether or not your fields are surface or sprinkler irrigated. THIS WEBSITE DOES NOT CONTAIN A REFERENCE PAGE FOR POWDERY MILDEW IN SUGARBEETS. CONTACT YOUR WHITE SATIN FIELD REPRESENTATIVE FOR INFORMATION REGARDING THEIR TREATMENT RECOMMENDATIONS AND ROTATION OF CHEMISTRIES.
stripe rust
Small Grains Treasure Valley - Idaho
Posted on: June 21, 2007 by Jerry Neufeld
Dr. Brad Brown is reporting some stripe rust on the UI Parma R and E station in some susceptible wheat varieties. Rust was found especially in a hard red winter wheat called Moreland. It would be appropriate to scout for stripe rust in late planted winter wheat and any spring wheat if you aren’t sure of the susceptibility of the varieties to stripe rust. Depending on the growth stage, it may or may not be too late to apply a fungicide.
Haanchen barley mealybug
Small Grains All Locations
Posted on: June 11, 2007 by Jerry Neufeld
Haanchen barley mealybug in north-central Idaho?
Mealybugs infesting spring barley, spring wheat and spring oats have been recovered from four commercial fields near Cottonwood, ID (Lewis and Idaho counties). Specimens additionally were recovered from two grassy weeds, wild oats and rat-tail fescue, at 2 of the 4 fields.
Tentative species identification as Trionymus haancheni, the Haanchen barley mealybug, is based solely on the fact that T. haancheni is the only mealybug known from cereals in Idaho. If expert examination confirms that these insects indeed are the Haanchen barley mealybug, these collections potentially constitute a significant change in host-plant range. Based on the best information currently available (i.e., research conducted by Juan M. Alvarez, University of Idaho), barley is considered the main host plant.
The first specimens were collected 22 May from a direct-seeded barley field that had been planted to winter wheat during 2006 and spring canola during 2005. Based on my 29 May site visit with Mr. Tom Gehring, Manager, Primeland Coop (Cottonwood), we estimated that approximately 5% of the field showed obvious damage in patches up to 50 X 50-feet where plants were stunted, yellowed, spotted or dead.
Mr. Gehring subsequently collected specimens at the other sites during the week of 4 June, and my subsequent visit today (8 June) again confirmed mealybug infestations in spring oats as well as on the weedy rat-tail fescue, Vulpia myuros. At all sites, bugs primarily were feeding on plant stems near the soil surface under field residue, though some also were collected from exposed leaves.
Barley growers in surrounding counties particularly might examine fields showing "wireworm spots" or similar patchy damage. Photos of the insect and pest biology are in University of Idaho Extension Publication CIS 1109, online at http://info.ag.uidaho.edu/pdf/CIS/CIS1109.pdf.
This information was provided by Dr. Ed Bechinski, Professor of Entomology,
Extension IPM & Pesticide Safety Education Coordinator at the University of Idaho.
Coddling Moth and Cherry Fruit Fly Update
Tree Fruits Treasure Valley - Idaho
Posted on: June 7, 2007 by Tony McCammon
As of
June 5th:
Coddling Moth DD
Biofix ACC.DD. 340dd 920dd(END Hatch)
Emmett 25-Apr 510.6 13-May 27-Jun
Fruitland 24-Apr 604.4 19-May 22-Jun
Parma 24-Apr 540.4 20-May 26-Jun
Snake River
Valley 25-Apr 610.0 20-May 21-Jun
Sunny Slope 25-Apr 540.5 20-May 25-Jun
Larval emergence for the first generation of codling moth is 69-79% completed for Southwest Idaho. Keep fruit protected from newly emerging codling moth larvae through the projected end of the 1st generation. Currently, the codling moth model predicts that egg hatch for the 1st generation will end between June 22 and June 26. A critical period for codling moth control is 340-640 DD after biofix (first adult activity). The percentage of egg hatch (larval emergence) for the first generation changes from 12 to 80% during this period. This relatively short 300 DD window of time (approx. 10-15 days in length) will see the greatest amount of codling moth pressure. It is important to have adequate residues of insecticide present on fruit during this period. There will be a 5-7 day “break” between the 1st and 2nd generation where fruit protection is not necessary.
Western Cherry Fruit Fly
Biofix AccDD
Emmett 25-May 228.7
Fruitland 27-May 283.3
Parma 28-May 171.9
Snake River
Valley 27-May 259.7
Sunny Slope 29-May 157.9
Based on numerous years of observation in Idaho, fruit is not susceptible to egg-laying from cherry fruit fly females until it changes from yellow to a salmon or blush color. When the earliest maturing fruit on the tree takes on a blush color, protect cherries with an insecticide application. Based on research, adult females are not ready to lay mature eggs until 7-10 days after first catch of the season. Use these two pieces of information for your location to initiate insecticide sprays to protect fruit from cherry fruit fly. Flies will develope according to temperatures like most insects. Spray timing can also be based on 190 Degree Days. Use the temperatures from the top of this page to time your applications.
Insecticides effective for WCFF:
- Spinosad GF-120 NF (apply with an electric pump sprayer mounted on a 4-wheeler; reapply every 7 days; excellent adulticide; not rainfast)
- Provado (moderate adulticide, excellent larvicide, can kill larvae within fruit; reapply every 14 days; watch for mite flare-up with repeated applications)
- Success and Entrust (reapply every 7 days)
- Dimethoate (Be careful follow instructions closely)
- Guthion (reapply every 14 days; 15 day PHI)
- Sevin (reapply every 7 days; watch for mite flare-up with repeated use)
- Diazinon (reapply every 7-10 days; 21 day PHI)
- Malathion (reapply every 3 days; watch for mite flare-up with repeated use)
Adult Colorado Potato Beetles
Potato Magic Valley
Posted on: June 7, 2007 by Jeff Miller
Adult Colorado potato beetles have been observed the past week. As Mike Thornton mentioned in an earlier alert, the adults do not cause too much damage. Look for eggs on the underside of potato leaves. When eggs begin to hatch a foliar insecticide application may be needed if a systemic insecticide was not used at planting.
Rhizoctonia canker
Potato Magic Valley
Posted on: June 6, 2007 by Jeff Miller
Rhizoctonia canker is developing on some potatoes. While there are no documented control measures that can be recommended at this stage of crop development, growers can look at underground stems to evaluate how severe Rhizoctonia stem canker may be for this season.
Rhizoctonia chemical control is obtained with seed-piece and and in-furrow treatments. It is not known if fungicide applications made at this time or later will have any effect on Rhizoctonia.
Alfalfa weevils and aphids
Alfalfa Magic Valley
Posted on: June 6, 2007 by Jeff Miller
Alfalfa weevils and aphids (species not identified) have been observed in alfalfa fields in the Rupert-Burley area.
Colorado Potato Beetle
Potato Treasure Valley - Idaho
Posted on: June 4, 2007 by Jerry Neufeld
Dr. Mike Thornton, from the UI Parma Research and Extension Center is reporting there are a lot of adult Colorado Potato Beetles in western Idaho potato fields right now. These first adults do not do much feeding damage, but growers should be watching for egg hatch if they want to time a foliar spray for the first generation of larvae.
2007 PNW Potato Insect Management Guidelines
Potato All Locations
Posted on: June 4, 2007 by Jerry Neufeld
The 2007 guidelines for managing insects in potatoes in the Pacific Northwest have been posted to the web. The document is authored by Alan Schreiber, Agriculture Development Group, Inc., Andrew Jensen, Washington State Potato Commission, Keith Pike, Washington State University and Gary Reed, Oregon State University. These guidelines are an update of the 2006 version. Changes include such things as: There are some products that are no longer registered on potatoes (such as Di-Syston and Guthion). There are several new products (such as Acramite and Beleaf) registered on potatoes. There are some changes in use patterns (such as Penncap M is no longer recommended for use on aphids, Assail is recommended for use on beet leafhopper). There are two significant additions to the guidelines. First, with the help of Juan Alvarez (U of Idaho), Idaho is included. Second, because of the surge in generic products, what is in what package is increasingly difficult to track. An attachment is included that lists every insecticide (398) registered for use on potatoes in Washington and Oregon. With the exception of a very small number of 24c registrations, this list should apply equally to Idaho. A list of 24c registrations in Idaho can be found at the following website: http://www.agri.state.id.us/Categories/Pesticides/registration/Section24cmain.php. The products are sorted by active ingredient, and include the product name, manufacturer and whether it is available as a 24c registration.
The document can be accessed by clicking on “Crop Info”, “Potato” and “2007 PNW Potato Insect Management Guidelines” or by going to the following web address: http://www.potatoes.com/Research-IPM.cfm.
Fruitgrower Meeting Wednesday June 6th
Tree Fruits Treasure Valley - Idaho
Posted on: May 31, 2007 by Tony McCammon
Fruitgrower meeting next wednesday 12:00 Marsing Sandbar restaurant. Just over the Bridge driving into marsing take a right.
Tom Tankersly will give us updates on orchard scouting observations
Tony McCammon will lead discussion on drought conditions and Cherry mildew information
For any questions contact Tony McCammon at 642-6022
or email at tonym@uidaho.edu
Western Cherry Fruit Fly
Tree Fruits Treasure Valley - Idaho
Posted on: May 30, 2007 by Tony McCammon
Western Cherry Fruit Fly (Sweet and tart cherry): Western cherry fruit fly adults have been caught in locations of Emmett May 25th and Sunny Slope May 29th. Based on numerous years of observation in Idaho, fruit is not susceptible to egg-laying from cherry fruit fly females until it changes from yellow to a salmon or blush color. When the earliest maturing fruit on the tree takes on a blush color, protect cherries with an insecticide application. Based on research, adult females are not ready to lay mature eggs until 7-10 days after first catch of the season. Use these two pieces of information for your location to initiate insecticide sprays to protect fruit from cherry fruit fly.
Insecticides effective for WCFF:
- Spinosad GF-120 NF (apply with an electric pump sprayer mounted on a 4-wheeler; reapply every 7 days; excellent adulticide; not rainfast)
- Provado (moderate adulticide, excellent larvicide, can kill larvae within fruit; reapply every 14 days; watch for mite flare-up with repeated applications)
- Success and Entrust (reapply every 7 days)
- Dimethoate (Be careful follow instructions closely)
- Guthion (reapply every 14 days; 15 day PHI)
- Sevin (reapply every 7 days; watch for mite flare-up with repeated use)
- Diazinon (reapply every 7-10 days; 21 day PHI)
- Malathion (reapply every 3 days; watch for mite flare-up with repeated use)
Snake River Weed Research Tour
Announcements All Locations
Posted on: May 23, 2007 by Nora Olsen
Mark your calendars now for the Snake River Weed Research Tour. The tour will be held at the Aberdeen R&E Center on June 19 and at the Kimberly R&E Center on June 20. Both locations will start with registration at 8:00 am and the tour begins at 8:30. They will conclude with an industry sponsored lunch at 12:00.
At Aberdeen the tour will focus on weed control research in potatoes.
At Kimberly the tour will feature weed control research in Roundup Ready sugar beets, spring wheat and barley, field corn, and potatoes.
For more information, contact Don Morishita at 736-3600 or Pamela Hutchinson at 423-4691.
Coddling moth and W. Cherry Fruilt Fly
All Crops Treasure Valley - Idaho
Posted on: May 18, 2007 by Tony McCammon
I wanted to update Coddling moth Spray dates. The morning of May 15th was the 250DD or first Hatch Date for coddling moth in Fruitland, Snake River Valley, Parma, and Sunny Slope. Emmett hit first hatch yesturday morning, May 17th. Coddling moth maximum larva hatch will be between May 21 and June 10 applications of insecticide are critical during this time period. Chemical applications
eggs: Horticultural oil, Esteem, Confirm, Intrepid, Azatin
larvae: Assail, Asana, Calypso, Carbaryl, Clutch, Diazanon, Guthion, Codling Moth Granulosis Virus, Imidan, Warrior, Sevin, Malathion
*Reapply insecticides based on the residual period (i.e., protection interval) of the product used, and be sure to rotate among pesticide classes.
Western Cherry Fruit Fly Control
Method 1: Fruit Maturity
Cherry fruits are not susceptible to egg-laying by adult females until they ripen to a salmon blush in color. Green fruits will not be attacked. Consider the maturity of the ripest fruit in an orchard, not the average.
Method 2: Adult Trapping
Adult flies do not use sexual pheromones, but are attracted to certain colors and odors. Yellow sticky panel traps (Pherocon AM®) with an external bait of ammonium carbonate (AC) are a moderately effective monitoring tool; unbaited traps should not be used. Place traps in cherry orchards before the first fly is expected [750-800 degree-days (DD)]in Sunnyslope flies were seen May 10, or by mid-May. Apply the first insecticide treatment 5 - 7 days or (190 DD-May 19) after first catch (females require 5 - 7 days for ovaries to mature.
For home and commercial orchards:
• spinosad (GF-120, Success, Entrust) – reapply every 7
days
• carbaryl (Sevin) – reapply every 7 days
• malathion (Malathion) – best when used just before
harvest as it lasts approximately 3 days
• synthetic pyrethroid insecticides – reapply every 7-14 days
∙ cyfluthrin (Baythroid) – commercial use only
∙ esfenvalerate (Asana, Ortho products)
∙ lambda-cyhalothrin (Warrior) – commercial use only
∙ permethrin (Ambush, Pounce, Ortho products)
For commercial orchards only:
• imidacloprid (Provado) – reapply every 14 days
• azinphosmethyl (Guthion) – reapply every 14 days
(scheduled for phase-out by 2012 by the U.S. Environmental Protection Agency)
• phosmet (Imidan) – reapply every 14 days; do not
use on sweet cherry
• chlorpyrifos (Lorsban) – reapply every 14 days; do
not use on sweet cherry
• diazinon (Diazinon) – reapply every 10-14 days
Western Cherry Fruit Fly
Tree Fruits Treasure Valley - Idaho
Posted on: May 16, 2007 by Jerry Neufeld
Ben Simko, Program Manager from ISDA has prepared a letter showing the predicted emergence dates for Western Cherry Fruit Fly for several areas in the Treasure Valley. To read the letter click on “Crop Info”, “Tree Fruit”, “Cherry”, “Western Cherry Fruit Fly” and lastly the link entitled “Western Cherry Fruit Fly predicted emergence for 2007”.
Approved Section 18 and 24c labels
Announcements All Locations
Posted on: May 10, 2007 by Jerry Neufeld
A complete list of approved section 18 and 24c labels for Idaho and Oregon can be found at the following links:
Idaho
http://www.agri.state.id.us/Categories/Pesticides/registration/Section18.php
http://www.ag.uidaho.edu/ipm/24C%20labels.htm
Oregon
http://www.pnn.wsu.edu/pnnor.html#Section24cs
Fruitgrower Meeting
Tree Fruits Treasure Valley - Idaho
Posted on: May 8, 2007 by Tony McCammon
This is a reminder of Wednesdays May 9th Growers Meeting at Nichols Steak House. High noon!
See you there.
Degree Day Accumulations
Tree Fruits Treasure Valley - Idaho
Posted on: May 8, 2007 by Tony McCammon
Projected Degree days for Coddling Moth as of May 7th 2007.
Coddling Moth DD 150dd 250dd
Emmett May 9 May 20
Fruitland May 9 May 19
Parma May 11 May 22
Snake River Valley May 10 May 20
Sunny Slope May 12 May 22
At 150dd to 200dd apply Esteem 35WP or Intrepid 2F to control Coddling moth at the early egg laying period. For best control during this period supplement this treatment with Pheromone treatments.
Fruitgrower Meeting Fruitland
Tree Fruits Treasure Valley - Idaho
Posted on: May 3, 2007 by Tony McCammon
Universtity of Idaho Extension in Payette County will host a Fruitgrower meeting on May 9th at 12:00 noon at Nichols Steak House in Fruitland. Essie Fallahi will lead a discussion on nutrient management of side blooms on apples, Kelly Henggeler will lead a discussion on labor issues, and Tom Tankersley on an orchard scouting update.
A second meeting will be offered on June 6th in Marsing at the Sand Bar Resturaunt. More information will follow.
