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Stripe Rust found in Winter Wheat
Small Grains All Locations
Posted on: June 25, 2009 by Juliet Windes
Active stripe rust was found in Idaho on Weston hard red winter wheat in a commercial field in the American Falls area on June 22, 2009. Weston was in milk stage, and stripe rust was found throughout the plant canopy. Infection was not severe, and was only 5% in severity and 8-10% incidence throughout the field. Stripe rust was found in Minidoka County north of Burley in Declo hard red winter wheat, and reported in northern Utah in winter wheat.
Stripe rust was also found on lower leaves of Moreland hard red winter wheat in breeding plots. Pustules were not actively sporulating, and Moreland was in early grain fill. (This was the Neeley area south west of American Falls.)
Most winter wheat is past the window of allowable fungicide application. Spring wheat varies in growth stages (depending upon elevation) from tillering to late boot. Excellent conditions exist for wheat production, especially in dryland production, where in some areas record-breaking rainfall has resulted in yield potential not seen in decades. Cold temperatures and frequent heavy rainfall has provided excellent conditions for the spread of stripe rust, but I have yet to see stripe rust in spring wheat or severe infections in winter wheat. NOW is the time to scout spring wheat fields for active pustules. Fungicide applications (up to labeled rate and growth stage) will control stripe rust. Always check labels and follow label directions. Additional information for control and pictures of stripe rust are available on our website at http://www.ag.uidaho.edu/scseidaho/ then click on "Disease Information" and then "Stripe Rust Information."
I have seen no stem rust or leaf rust. Other diseases found include Pythium and eyespot (Pseudocercosporella). Black chaff in wheat and bacterial stripe in barley have caused problems due to sleet and hail storms, and barley scald has progressed to the flag leaf in some commercial barley production fields in the Magic Valley around Twin Falls.
Juliet Windes
Juliet Marshall Windes
Cereals Cropping Systems, Agronomy and Pathology Assistant Professor
1776 Science Center Drive Suite 205
Idaho Falls, ID 83402-1575
208-529-8376 office
208-390-4859 mobile
208-522-2954 FAX
powdery mildew in sugarbeets
Sugarbeets Treasure Valley - Idaho
Posted on: June 25, 2009 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 the week after July 4 regardless of whether or not your fields are surface or sprinkler irrigated. You may also want to include an insecticide treatment for black bean aphid or loopers in the mildew tank mix. CONTACT YOUR WHITE SATIN FIELD REPRESENTATIVE FOR INFORMATION REGARDING THESE TREATMENT RECOMMENDATIONS AND ROTATION OF CHEMISTRIES.
Organic production field day
All Crops All Locations
Posted on: June 18, 2009 by Nora Olsen
The University of Idaho will host an organic field day at the Kimberly R&E Center on Tuesday, July 21 at 9:30 a.m. Eleven acres of the research station were certified organic in 2008. Several researchers are now studying various aspects of organic production at this site. This season the rotation includes organic winter wheat, dry beans, and potatoes. The field day will feature the following topics:
* Transition of the organic research site
* Organic nutrient management and sources
* Organic weed management studies, including cultivation methods
* Organic disease management, including microbial control for early blight in potatoes
* Organic potato variety trial and storage research
The cost is $10 and includes lunch.
Please RSVP with Jen Miller at 850-6504 or jmiller@pesticide.org.
The Northwest Coalition for Alternatives to Pesticides and Three Rivers RC&D are helping to organize this field day. These organizations are encouraging car pooling from the Boise and Pocatello areas.
To car pool from Boise, contact Jen Miller at 850-6504 or jmiller@pesticide.org.
To car pool from Pocatello, contact Paula Jones at 237-4628 ext 104 or Paula.Jones@id.usda.gov.
Directions to Kimberly R&E Center: 3806 North 3600 East
From I-84, take exit 182 and travel south on Hwy. 50. Turn north at mile marker 1 on 3600 E. take first right and park at Potato Storage Facility.
Parma Small Grain Tour Friday
All Crops All Locations
Posted on: June 18, 2009 by Steve Norberg
Parma Small Grains Tour
A tour of the small grains research at the Parma R & E Center near Parma is scheduled for June 19, 2009. We will register at 9 AM and start the tour at 9:20 – 9:30. A lunch will be served at the end of the tour for those attending Wheat and Barley Variety Performance.
Is there a new variety in the pipeline for you? Seed banded N for winter wheat. Do new slow release N technologies provide any advantage for banding fertilizer with seed? Increasing wheat protein with late season N. Can new enhanced N fertilizers improve topdressed or foliar N availability for protein enhancement ? Relay cropping in barley. Is it feasible to plant oilseeds or even corn into standing barley for harvest in the same season?
Iris Yellow Spot Virus
Onion Treasure Valley - Idaho
Posted on: June 16, 2009 by Jerry Neufeld
I received the following email from Dr. Mike Thornton, from the UI Parma Research and Extension Center regarding Iris Yellow Spot Virus in onions.
On June 16th we noticed severe symptoms of Iris Yellow Spot Virus in an onion trial at the Parma R&E Center. This is 3 to 4 weeks earlier than we normally see virus symptoms in commercial onions. Although these onions were not overwintering, they were planted in early March from sets, and were the first field with green foliage in this region. There were also volunteer onions in an adjacent field that may have acted as a source of thrips and virus.
The early appearance of virus in this field points out the need for onion producers to be vigilant in their thrips control programs. This is especially important for fields close to overwintering onions or volunteers as these plants can act as a “green bridge” for thrips and IYSV.
Try to minimize stress by making sure fields are maintained at an adequate fertility level, and that the soil moisture is kept at about the 20 centibar level.
Late blight forecast for southern Idaho for 2009
Potato All Locations
Posted on: June 12, 2009 by Jeff Miller
Our cool, wet spring has created an environment favorable for the development of late blight. A prediction model developed at the University of Idaho by Henderson et al. indicates that the likelihood of late blight development is relatively high. The forecast value is highest in the Fort Hall area and lowest in Parma. The actual occurrence of late blight and the date of first appearance will be affected by subsequent weather and fungicide application patterns.
The forecast in 2008 was also relatively high early in the season, but hot, dry weather was likely responsible for the limited development of late blight. It is critical to scout fields. Any area of the field where plant leaves and stems stay wet for extended periods of time (e.g. near the center points of pivots, irrigation overlaps, along mainlines, near windbreaks) should be scouted intensely. The use of a protectant fungicide is recommended prior to row closure.
A full discussion of different fungicides labeled for late blight control, along with information on application method and frequency is attached here and also available at:
http://www.millerresearch.com/reports/Overview_of_Fungicides_for_Late_Blight.pdf
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
