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corn earworm
All Crops Treasure Valley - Idaho
Posted on: August 7, 2008 by Jerry Neufeld
According to UI CIS 366 “Timing Corn Earworm Control” summer moths began laying eggs in fresh corn silk at approximately 1300 growing degree days (GDD), approximately August 2. Egg hatch and larvae attack begins about 73 GDD later. The peak egg laying period should be between now and 1650 GDD. If you have fresh silking corn during this period (about the next two weeks) it is important to monitor for corn earworm larvae and treat if necessary.
field burning training
All Crops Treasure Valley - Idaho
Posted on: August 6, 2008 by Jerry Neufeld
Below is additional information about the Idaho DEQ field burning program.
Idaho Department of Environmental Quality (DEQ) is pleased to announce our current Idaho DEQ Grower Training schedule to Southwestern Idaho Counties, including Ada, Canyon, Gem, Payette, Adams and Washington.
• When: Monday August 11th at 700 am
• Where: University of Idaho Extension, Education Center, 1904 E. Chicago Street, Caldwell, Idaho, 83605
• Course Length: 1 ½ to 2 hours with question and answer period afterwards
• When: Tuesday August 19th at 7:00 am
• Where: Vendome Event Center, 309 State Street, Weiser, Idaho 83672
• Course Length: 1 ½ to 2 hours with question and answer period afterwards
There are no fees involved with this training, although there are fee requirements for your crop residue burning permit. If you have any questions regarding Crop residue burning, directions to the training or other Grower Training information please call us toll free at 1- 866-224-2456, or try (208) 373-0502 and ask for Jonathan Pettit or contact Michael Miller at (208) 860-1478.
field burning
Announcements All Locations
Posted on: August 5, 2008 by Jerry Neufeld
Attached are files with information about the new field burning procedures. You will want to read these files as the process for field burning has changed since the field burning program moved from ISDA to Idaho DEQ.
Late blight in southern Idaho
Potato All Locations
Posted on: August 4, 2008 by Jeff Miller
Late blight was confirmed today in the Mini-Cassia area. The disease pattern is consistent with a seed-borne source of the pathogen. The field in question had received fungicide applications and lesions could not be found in any adjacent fields. The field is scheduled to be killed today. Based on this fact and the absence of thundershowers, the probability of field to field spread is very low. If growers have been applying fungicides with activity against late blight then additional applications are not needed. Fungicides active against late blight include (but are not limited to) standard protectants (chlorothalonil and EBDC based products), strobilurins, Omega, and Gavel. Endura is not effective against late blight.
This finding underscores the importance of buying clean seed and scouting. Even though the weather has not been favorable for late blight development, the disease can get started inside a potato canopy if inoculum is present.
If you have questions or concerns please contact Jeff Miller at 208-431-4420.
Update on corn earworm
Corn Treasure Valley - Idaho
Posted on: July 24, 2008 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 1136 GDD in the Caldwell area, 1076 GDD in the Nampa area and 1297 GDD in the Parma area. We will hit 1300 GDD in the Caldwell area on 8/1, in the Nampa area we will hit 1300 GDD on 8/2, and in the Parma area we hit 1300 GDD on 7/24. Those fields with fresh silk at 1300 GDD are most vulnerable to attack from corn earworm larvae.
Stripe Rust in Moreland Winter Wheat, Ririe
Small Grains Eastern Idaho
Posted on: July 23, 2008 by Juliet Windes
While small amounts stripe rust had previously only been confirmed in the Treasure Valley, yesterday I found it in Moreland hard red winter wheat in Ririe, ID. It was a significant infection, occurring on about 30-40% of the total leaf surface. The crop was in late milk to early dough, and it was too late to spray fungicides. In addition to significant stripe rust, there was about 30% white heads forming from foot rot fungi, probably take-all. Black chaff was also prevalent.
Addtional surveys will be conducted to see if the fungi have moved beyond the winter wheat fields into adjacent susceptible spring wheat. At this time, I consider this to be an isolated incident. Early season conditions were extremely conducive to the development of the disease, but there was no reported stripe rust. Spread of the current infection from this focus should be limited due to hot, dry weather conditions.
Information on control and effective fungicide treatments is availbale on our cereals website: http://www.ag.uidaho.edu/scseidaho/ then click on "Publications" for Plant Disease Management Reports, "Cereal Diseases" and / or "Routine Fungicde Yield and Economic Data".
Iris Yellow Spot Virus
Onion Treasure Valley - Idaho
Posted on: July 23, 2008 by Jerry Neufeld
Lynn Jensen from the OSU Malheur County Extension office is reporting that Iris yellow spot virus has been confirmed in a bulb onion crop in the Nyssa and Ontario, Oregon areas. Make sure fields are maintained at an adequate fertility level, and that the soil moisture level is kept at about the 20 centibar level. Make thrips control insecticide applications every 7 - 10 days.
corn earworm
All Crops Treasure Valley - Idaho
Posted on: July 16, 2008 by Jerry Neufeld
BELOW ARE PDF FILES WITH THE RECOMENDATIONS FROM THE 2008 PNW INSECT MANAGEMENT HANDBOOK FOR CONTROLLING CORN EARWORM LARVAE IN SWEET CORN SEED, AND FIELD AND SILAGE CORN.
» Control for earworm in field and silage corn
corn earworm
Corn Treasure Valley - Idaho
Posted on: July 16, 2008 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 978 GDD in the Caldwell area, 927 GDD in the Nampa area and 1126 GDD in the Parma area. We are accumulating approximately 20 GDD per day. We will hit 1300 GDD in the Caldwell area on approximately 8/1, in the Nampa area we will hit 1300 GDD on approximately 8/2, and in the Parma area we will hit 1300 on approximately 7/23. Those fields with fresh silk at 1300 GDD are most vulnerable to attack from corn earworm larvae. We will hit 1300 GDD about 7-10 days later than last year.
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 egg per 2 silk 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.
powdery mildew in sugarbeets
All Crops All Locations
Posted on: July 10, 2008 by Jerry Neufeld
Powdery mildew has been positively identified by Amalgamated Sugar Company Representatives in sugarbeet fields in the western Treasure Valley. There have also been reports of loopers in many Treasure Valley sugarbeet fields. As you scout your fields for powdery mildew, you may also want to be on the lookout for loopers and black bean aphids. Contact your field representative from the Amalgamated Sugar Company if you have questions about treatment options.
iris yellow spot virus
Onion Treasure Valley - Idaho
Posted on: July 7, 2008 by Jerry Neufeld
Iris yellow spot virus has been confirmed in a bulb onion crop in the Fruitland area. This is an area that was hit hard by the virus last year, with increased potential for problems this year due to higher thrips numbers and a slow start to the growing season. Make sure fields are maintained at an adequate fertility level, and that the soil moisture level is kept at about the 20 centibar level. Make thrips control insecticide applications every 7 - 10 days.
iris yellow spot virus and downy mildew
All Crops Treasure Valley - Idaho
Posted on: July 1, 2008 by Jerry Neufeld and Lynn Jensen
Iris yellow spot virus has been positively identified on onions planted for seed. The onions were planted last year, and the virus symptoms are typical of scape lesions usually associated with IYSV on seed onions (click on image below). Bulb onion growers should be aware that the virus is likely in all overwintered onion seed fields, and should aggressively manage onion thrips in fields located near seed fields, particularly those fields located down wind from the seed fields.
In addition, downy mildew has been identified on the same onion scapes as the IYSV. This is highly unusual, and is likely due to the cool spring weather. If the weather cools to the mid 70's and we get summer showers, then there is a chance that the downy mildew could spread to the bulb crop. Applying a registered fungicide along with your thrips sprays may alleviate any potential problem. The following link will take you to the Oregon State University Extension website that contains images and control measures for downy mildew: http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=752.
Colorado potato beetle larvae
Potato Magic Valley
Posted on: June 30, 2008 by Jeff Miller
Colorado potato beetle larvae are now emerging from eggs in the Rupert area. Growers who have not put on an at-planting insecticide need to apply a foliar insecticide.
Malheur Experiment Station Field Day
Announcements Treasure Valley - Idaho
Posted on: June 30, 2008 by Jerry Neufeld
The Malheur Experiment Station Field Day is July 9, 2008. The pdf files below contain the program for the day.
powdery mildew in sugarbeets
Sugarbeets All Locations
Posted on: June 27, 2008 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.
stripe rust in wheat
Small Grains All Locations
Posted on: June 25, 2008 by Jerry Neufeld
The following information was provided by Dr. Brad Brown from the UI Parma R and E Center.
It appears that Treasure Valley wheat has gone yet another year without significant stripe rust incidence. The only stripe rust we are aware of in western Idaho thus far is a small infection (less than 5%) in a susceptible hard red winter wheat variety called Moreland. It is the only wheat variety of those we evaluate in both the Extension winter and spring wheat variety performance trials that we have found any rust in. Varieties commonly grown in the area do not appear to be susceptible to the stripe rust race infecting Moreland. Even Brundage soft white winter wheat, known to be less tolerant to stripe rust than Stephens, looks pretty clean on the Parma R & E Center.
Scouting for stripe rust is still a good policy, especially for spring plantings that are slower to develop. Development of both winter and spring wheat is later than normal this year. Even though some fields may have been treated much earlier with tank mixes of fungicides and herbicides, that does not preclude infection during latter grain filling.
Some winter wheat planted after wheat is showing significant root rot. The symptoms include heads that are maturing earlier than those around them, and are poorly filled or blank. The root systems of plants dug up, when rinsed with water, generally show limited root growth or roots browned from fungal infection, sometimes encrusted with fungal mycelium that does not wash off readily. The crown tissue, instead of white to cream colored, can show browning or blackened deterioration. The symptoms of some root rots do not necessarily show up on the lower stem. At this point of crop development the damage to the crop is done and there is no treatment for control.
Colorado Potato Beetle
Potato Treasure Valley - Idaho
Posted on: June 24, 2008 by Jerry Neufeld
A few Colorado Potato Beetle larvae are being found in the Greenleaf area. Growers should now be scouting for CPB larvae to time your foliar sprays.
UI Vegetable Field Tour
Announcements Treasure Valley - Idaho
Posted on: June 24, 2008 by Jerry Neufeld
Vegetable Field Tour
Parma R & E Center
July 8, 2008 - 1:30 pm
Onions
• Early Banded Nitrogen Sources for Onions
• Thrips and Iris Yellow Spot Virus Control Strategies
• Effect of Application Volume on Thrips Control with Carzol
• Onion Powdery Mildew
Sweet Corn
• Cultivars for Direct Market Growers in the Treasure Valley
• Sweet Corn Seed Treatments
Potatoes
• Green Manures and Trap Crops for Potato Cyst Nematode Eradication
• Specialty Processing and Fresh Market Potato Cultivars
• Management of Stem Number
• Evaluation of Perform Leaf Growth Regulator
No RSVP is necessary to attend Vegetable Field Tour, just show up. Refreshments will be served.
Emmett Fruitgrower Lunch Meeting
Tree Fruits Treasure Valley - Idaho
Posted on: June 20, 2008 by Tony McCammon
June 25th: Fruitgrowers are invited to learn about Abiotic and Biotic Orchard diseases next Wednesday at 11:00am in Emmett at the La Costa Family Mexican Restaurant in Emmett. 517 N. Washington Ave. 365-1567.
Speakers: Essie Fallahi UI Pomology Specialist and Krishna Mohan UI Pathology Specialist. Tom Tankersley orchard Updates.
Stripe Rust in Wheat
Small Grains All Locations
Posted on: June 18, 2008 by Juliet Windes
Stripe rust on wheat or barley has NOT yet been reported in Idaho. However, it was reported in Montana, and I have seen symptoms similar to a resistant-type reaction in dryland winter wheat (flecking similar to resistance or to pre-putsule formation that could also be attributed to wind driven sand blasting). PLEASE scout susceptible winter wheat varieties such as Moreland, and report suspected outbreaks to me (Juliet Windes 208-529-8376) if found in District III or IV, Stephen Guy (208-885-6744) in District I, or Brad Brown in District II.
In most cases, we are beyond the spray window for applying fungicides in winter wheat, but not for spring grains. The environment has been very conducive for infection and spread. Stripe rust pressure has been low in the PNW, but areas in California have had high disease pressure. There have been strong winds coming from the Sacramento area directly to southern Idaho, so outbreaks are possible. Please visit the cereals website at http://www.ag.uidaho.edu/scseidaho/ for additional information on stripe rust. The following email was sent from Montana State University:
From: William Grey [mailto:WGrey@Montana.edu]
Sent: Tuesday, June 17, 2008
Report of Stripe Rust on winter wheat in Bozeman, June 17, 2008. Dr. Mary Burrows, Extension Plant Pathologist, noted stripe rust on two winter wheat cultivars grown on the A.H. Post Farm, MSU, Bozeman, MT. Varieties are Norris CL and Hyalite CL (Clearfield varieties), field size is 2.5 acres per variety. Discrete and small patches of stripe rust in each of the fields. Individual leaves had linear stripes of sporulating rust covering 10% of leaf area and with symptomatic leaves in the lower leaf canopy. Winter wheat is late tillering and early stem elongation stage of development.
Malheur Experiment Station Field Day
Announcements All Locations
Posted on: June 17, 2008 by Jerry Neufeld
You are invited to the Malheur Experiment Station Annual Field Day presented by the OSU Malheur Experiment Station on July 9, 2008 from 8:30 am to 1:00 pm. Complimentary lunch will be served. Please reserve a lunch by calling Janet Jones at (541) 889-2174 or janet.jones@oregonstate.edu.
Leaf miners in sugarbeets
Sugarbeets Magic Valley
Posted on: June 16, 2008 by Steve Hines
Leaf miners have been found in sugar beets in the MiniCassia area. Mainly in larger beets. If you have questions, call your Almagameted Sugar fieldman.
Cereal Leaf Beetle Brown Bag Luncheon
All Crops All Locations
Posted on: June 13, 2008 by Steve Norberg
On June, 17th at noon at the Malheur Extension Office, 710 SW 5th Ave. Ontario, OR. Steve Norberg will discuss life cycle and control of Cereal Leaf Beetle with plenty of time for questions and answers. Bring your own lunch and eat during the
discussion. If you have any questions about the event, give me a call at 541-881-1417.
Western Cherry Fruit Fly
Tree Fruits Treasure Valley - Idaho
Posted on: June 12, 2008 by Jerry Neufeld
Ben Simko from ISDA has prepared a memo with the recommended first treatment dates for Western Cherry Fruit Fly for several areas in the Treasure Valley. To see the memo click on “Crop Info” then “Tree Fruit” then “Cherry” then “Western Cherry Fruit Fly” then click on the link entitled “Western Cherry Fruit Fly Predicted Emergence for 2008.” For treatment information scroll down to the Western Cherry Fruit Fly Alert Tony McCammon posted on June 3, 2008.
