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Late blight
Potato Eastern Idaho
Posted on: August 20, 2004 by Jeff Miller
More fields have been identified with late blight, but they are all close to the original 5 identified focal points (3 in western Bingham county, 1 each in Cassia and Minidoka). Scouts in Bingham county have not found any late blight in the eastern portion of the county.
Recent thunderstorms have significantly increased the risk of late blight spreading to unprotected fields. Growers need to apply fungicides immediately after thundershowers to maintain adequate protection. As fields begin to die, fungicide application intervals can be stretched, but growers need to scout fields to be sure the pathogen does not come in at the end of the season.
If blight is found in a senescing field, the vines in the affected area should be killed. Anything that reduces the time of exposure of tubers to infected vines aboveground will reduce the risk of tuber blight in storage.
spider mites in several crops
Potato Treasure Valley - Idaho
Posted on: August 6, 2004 by Jerry Neufeld
A Simplot fieldman has identified several fields of Russet Burbank potatoes in the Parma area that have significant numbers of spider mites in them and are requiring a border spray. A fieldman from Landview Fertilizer is reporting that spider mites have been found south of Nampa in several garden seed bean fields. Mites are also being found in corn and alfalfa seed fields. High populations of spider mites can significantly damage crops in several days.
corn earworm
Corn Treasure Valley - Idaho
Posted on: August 4, 2004 by Jerry Neufeld
The second generation of corn earworm moths will lay eggs in the silk of corn between 1450 and 1650 growing degree days (GDD). We are currently at approximately 1500 GDD. We will be at 1650 GDD on about August 11. It is important to continue scouting your corn fields for earworm eggs.
corn earworm
All Crops Treasure Valley - Idaho
Posted on: August 4, 2004 by Jerry Neufeld
The second generation of corn earworm moths will lay eggs in the silk of corn between 1450 and 1650 growing degree days (GDD). We are currently at approximately 1500 GDD. We will be at 1650 GDD on about August 11. It is important to continue scouting your corn fields for earworm eggs.
Late Blight
Potato All Locations
Posted on: July 30, 2004 by Nora Olsen/Terry Miller
Late blight has been confirmed in Minidoka County.
Iris Yellow Spot Virus in onions
All Crops Treasure Valley - Oregon
Posted on: July 30, 2004 by Lynn Jensen
Symptoms that appear to be iris yellow spot virus are showing in fields around the Ontario area. Be sure to make sure the onions are not placed in a stressed condition, particularly water stress.
Powdery mildew on potatoes
All Crops Treasure Valley - Oregon
Posted on: July 30, 2004 by Lynn Jensen
Powdery Mildew has been identified on furrow irrigated potatoes around the Ontario area. An application of sulfur to furrow irrigated potates can help control the disease.
Potato Blight
Potato Eastern Idaho
Posted on: July 27, 2004 by Jeff Miller
Late blight has been found in Bingham county. So far, only one outbreak has been confirmed. However, the thundershowers that came across eastern Idaho Monday had the potential to spread the spores widely across the eastern portion of the state.
Most late blight fungicides are like sunscreen. They offer good protection wherever you get coverage and the fungicides get worn off over time. If you havent applied a fungicide in the last week, apply as soon as possible. As long as the current weather pattern persists, fungicides should be applied on a weekly schedule.
Standard protectant fungicides, such as EBDC or chlorothalonil are effective. Performance can be improved by adding Curzate, Acrobat, Previcur, or SuperTin. The add-in fungicides just mentioned should not be used alone. Gavel and Omega are two stand-alone products that are extremely effective against late blight.
For more information, call University of Idaho Extension personnel at the following numbers:
Treasure Valley: 722-6701 (Mike Thornton)
Magic Valley: 736-3600 or 423-6621 (Nora Olsen)
Eastern Idaho: 529-8376 (Phil Nolte), 785-8060 (Bill Bohl), or 397-4181 (Jeff Miller)
More information can also be found at:
http://www.ag.uidaho.edu/potatopath
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 26, 2004 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 1313 GDD in the Caldwell area. Maximum numbers of first generation moths should be laying eggs in corn silk now.
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 19, 2004 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 1070 GDD in Caldwell and 1101 GDD in the Parma area. First generation moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the ears. The GDD model is predicting we will reach 1300 GDD at Caldwell on July 29 and at Parma on July 28.
White mold
Potato Eastern Idaho
Posted on: July 19, 2004 by Jeff Miller
White mold has been found in the Magic Valley. Weather conditions have become favorable for the development of white mold as daytime temperatures are becoming warmer. Fungicides work best when applied BEFORE symptoms are present in a field.
White mold
Potato Magic Valley
Posted on: July 19, 2004 by Jeff Miller
White mold is appearing in the Magic Valley. If you have a field with a history of white mold and have not treated, now is a good time to make a fungicide application for white mold control. All fungicides work most effectively when applied BEFORE the disease appears.
Green peach aphids
Potato Eastern Idaho
Posted on: July 19, 2004 by Jeff Miller
Colonizing green peach aphids have been found in Power and Bingham counties. Scout field edges (particularly nightshade plants) to see if aphids are present. Information on managing green peach aphid as it relates to net necrosis can be found at:
http://www.ag.uidaho.edu/potatopath/aphid_alert.htm
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 12, 2004 by Jerry Neufeld
According to the Oregon State University Growing Degree Day (GDD) model for Corn Earworm we are currently at 971 GDD in Caldwell and 994 GDD in the Parma area. First generation moths will begin laying eggs in fresh corn silk at approximately 1300 GDD. Eggs will hatch a few days after reaching 1300 GDD and the larvae will then begin feeding on the ears. The GDD model is predicting we will reach 1300 GDD at Caldwell and Parma on about July 31. A few earworm larvae are already showing up in sweet corn fields in the Wilder area. As we approach 1300 GDD you will want to step up your field scouting and take the appropriate control measures.
powdery mildew in sugarbeets
Sugarbeets Treasure Valley - Idaho
Posted on: July 12, 2004 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Representatives in sugarbeet fields in the western Treasure Valley, Wilder and Star areas. In addition, black bean aphids and loopers have been found in several sugarbeet fields around the county. An insecticide for aphids and loopers can be tank mixed with a fungicide to treat both pests at the same time.
Laredo is not available this year to treat powdery mildew in sugarbeets. U of Idaho Sugarbeet Specialist Dr. John Gallian is recommending that you do not use chemicals with the same mode of action more than once a year on the same sugarbeet fields. In addition, Dr. Gallian is recommending the addition of 5 pounds of sulfur to each treatment in order to fight resistance. Contact your AMSCO field representative if you have any questions.
Early blight
Potato Eastern Idaho
Posted on: July 8, 2004 by Jeff Miller
We have reached the threshold (P-Days) for early blight in the American Falls-Aberdeen area. Now is a good time to apply a fungicide with good activity on early blight. Please contact Jeff Miller at 397-4181 if you have any questions.
Malheur Exp. Station Field Day July 14
All Crops Treasure Valley - Oregon
Posted on: July 2, 2004 by Clint Shock
The Malheur Experiment Station Field Day July 14 will feature crop production tours in the morning, a presentation on black flies (buffalo gnats) during the lunch hour, and in the afternoon a specialty presentation on high efficiency motors for single phase power lines and a tour of drip-irrigated onion fields. For more details visit our events web page at http://www.cropinfo.net/events.htm.
Reserve your lunch with Janet Jones, (541) 889-2174.
Malheur Exp. Station Field, July 14
Announcements Treasure Valley - Oregon
Posted on: July 2, 2004 by Clint Shock
The Malheur Experiment Station Field Day July 14 will feature crop production tours in the morning, a presentation on black flies (bufalo gnats) during the lunch hour, and in the afternoon a specialty presentation on high efficiency motors for single phase power lines and a tour of drip-irrigated onion fields. For more details visit our events web page at http://www.cropinfo.net/events.htm
Reserve your lunch with Janet Jones, (541) 889-2174.
Section 18 approval for Success on onions
Onion Treasure Valley - Oregon
Posted on: July 1, 2004 by Lynn Jensen
Success has recieved approval for use on onions for thrips control in Oregon (Idaho approval is expected) as a section 18 label.
Early blight
Potato Magic Valley
Posted on: June 29, 2004 by Jeff Miller
The P-Day threshold for early blight has been reached in the Twin Falls area. As of this week, 300 P-days have accumulated using May 10 as an estimated general emergence date. The application threshold has not been reached yet in the eastern Magic Valley (Rupert-Burley).
green peach aphids
Potato Treasure Valley - Idaho
Posted on: June 29, 2004 by Jerry Neufeld
Mike Thornton, Extension Specialist and Superintendent at the U of I Parma R and E Center is reporting that colonizing green peach aphids have been found in the Treasure Valley. Carefully scout fields and apply appropriate insecticides as necessary.
green peach aphids
Potato Magic Valley
Posted on: June 25, 2004 by Jerry Neufeld
Nora Olsen, Extension Specialist with the U of I at the Twin Falls R and E Center is reporting that colonizing green peach aphids have been identified in the Magic Valley. Careully scout fields and apply appropriate insecticides as necessary.
powdery mildew in sugarbeets
Sugarbeets Treasure Valley - Idaho
Posted on: June 25, 2004 by Jerry Neufeld
Amalgamated Sugar Company Field Representatives are saying that now is the time to be considering your treatment plan for powdery mildew in sugarbeets. While mildew has not yet been found in the Treasure Valley, the modes of action of the mildew chemistries work best if treatments are applied before mildew is even found in the field. Dennis Searle, AMSCO Agronomist is recommending mildew applications in the west end of the Treasure Valley by July 5 and applications in the east end of the Treasure Valley no later than July 10. Dennis says that treatments should be made by these dates regardless of whether or not your fields are surface or sprinkler irrigated. Also, loopers and other worms are being found in sugarbeet fields. Be on the look out for these pests. In many cases an insecticide can be tank mixed with your mildew treatment. CONTACT YOUR FIELD REPRESENTATIVE FROM AMSCO IF YOU HAVE ANY QUESTIONS.
Early blight
Potato Treasure Valley - Idaho
Posted on: June 21, 2004 by Jeff Miller
The forecast used to predict early blight (P-Days) indicates that the threshold for treatment has been reached in the Treasure Valley. An application of a higher quality early blight material (strobilurin) is warranted if early blight is a concern.
Late blight
Potato Eastern Idaho
Posted on: June 21, 2004 by Jeff Miller
The weather in southerin Idaho has been extremely favorable for late blight. Disease forecasting models indicate that 2004 may be a late blight year. Apply protectant fungicides just prior to row closure and again 7 days later. After that, adopting a wait and see approach may be valid. Scout wet field areas weekly after row closure. If you have any questions, please contact Jeff Miller at 397-4181.
