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Virus disease in onions
Onion All Locations
Posted on: July 26, 2001 by Lynn Jensen, Brad Geary, Vincent Bijman
Iris yellow spot virus has been positively identified on onions in several locations of the Treasure Valley. These sites include the Oregon Slope area and the Nyssa area. In addition, plants with similar symptoms have been seen in the Homedale/Marsing and Parma areas.
Symptoms include straw colored chlorotic ring spots on leaves, followed by deterioration of the leaf. In Israel the disease has led to a rapid die of leaf tissue, causing the field to look like a straw field. Their name for the disease is "straw bleaching". The disease is known to be transmitted by onion thrips, but thus far Western Flower thrips have not been associated with the disease.
The disease has probably been here for several years, but not identifyed until now. A number fields died eary last year, probably due to the virus. It has been identifyed in both bulb and seed crops.
Fungicides are not effective. Probably most of the plant infection has already occured. More information will be sent out as it becomes available.
Powdery Mildew in Hops
Hops All Locations
Posted on: July 23, 2001 by Jerry Neufeld
Hop Powdery mildew continues to spread to hop fields in southwestern Idaho. Current weather conditions in this area continue to favor the growth, reproduction, and spread of hop powdery mildew. In addition, most of the hop acres in Canyon County are planted to powdery mildew-susceptible varieties. Fields of Zeus hops are highly susceptible and should be treated prophylactically with a protectant fungicide. As more acres of Zeus become infected, Galena, Willamette and Chinook hops may need to be treated as well. It is imperative to check hop yards at least once per week to determine the level of powdery mildew and to assess the effectiveness of treatments. Information provided by Jim Barbour from the U of Idaho, Parma Research and Extension Center.
Corn Earworm
Corn All Locations
Posted on: July 23, 2001 by Jerry Neufeld
The growing degree day (gdd) totals for corn earworm through July 25, 2001 are:
Caldwell-1360
Nampa-1359
Parma-1634
The next generation of corn earworm will lay eggs between 1450 and 1650 gdd. The OSU model predicts Caldwell and Nampa will reach 1450 gdd on July 30.
numerous green peach aphids
Potato All Locations
Posted on: July 20, 2001 by Brad Geary
Numerous green peach aphids have been found in potato fields near Parma, Middleton, Marsing and Caldwell. We are counting 40-50 aphids/100 leaves in some fields. The Mountain Home, Glenns Ferry area fields do not appear to have the high populations we are experiencing west of Boise. University of Idaho potato scouts have counted 1-2 aphids/100 leaves in the Mountain Home, Glenns Ferry area. We hope that aphid control measures have been implemented in your potato management programs.
corn earworm
Corn All Locations
Posted on: July 19, 2001 by Jerry Neufeld
Corn earworm moths will begin laying eggs in the silk of corn that is silking at about 1300 growing degree days(gdd). According the Oregon State University Model, we are at 1247 gdd in Caldwell and 1242 gdd in Nampa. At Parma we are at 1493 gdd which is the time for second generation egg laying. You will want to scout fields take control measures as needed.
Corn Earworm
Corn All Locations
Posted on: July 13, 2001 by Jerry Neufeld
Corn earworm moths will begin laying eggs in the silk of corn that is silking at about 1300 growing degree days (gdd). According the Oregon State University Model, we are at 961 gdd in Caldwell and will reach 1300 gdd on approximately July 30. In Nampa we are at 1161 gdd and will reach 1300 gdd on approximately July 21. At Parma we are at 1300 gdd now. You will want to scout fields that are silking around 1300 gdd and take control measures as needed.
Cabbage Loopers in Mint
Mint none
Posted on: July 11, 2001 by Jerry Neufeld
Fred Butler is reporting a large infestation of cabbage loopers in mint fields in the Wilder area.
Powdery mildew on sugarbeets
Sugarbeets All Locations
Posted on: July 10, 2001 by Bob HuffakerBen Simko
Powdery mildew is showing up on sugarbeets in the Treasure Valley. Remember that Larado has recieved a section 18 label for Idaho and Oregon. This alert was submitted once, but at least some people did not recieve it, so it is being resubmitted.
Powdery mildew on sugarbeets
Sugarbeets All Locations
Posted on: July 10, 2001 by Bob Huffaker
Powdery mildew has been found on sugarbeets in the Valley. Remember that Larado has been cleared for use in both Idaho and Oregon.
information about potato insects
Potato All Locations
Posted on: July 10, 2001 by Jerry Neufeld
There is a new newsletter at the U of Idaho's Southern Idaho Entomology Homepage. The most current newsletter contains information about the Colorado Potato Beetle and Green Peach Aphid. Please go to the following address to view the pages: http://www.uidaho.edu./so-id/entomology
O.S.U. Malheur Experiment Station Field Day on July 11th
Announcements none
Posted on: July 9, 2001 by Ben Simko
OSU Malheur Experiment Station will hold this year's field day on Wednesday July 11. To RSVP for lunch or for more information on tour topics and start times contact the Station at 889-2174 or visit the Malheur Expirement Station website.
Powdery Mildew Control Failure in Hops
Hops none
Posted on: July 9, 2001 by Jerry Neufeld
The Washington Hop Commission has reported failure of Flint to control Powdery Mildew in Hop fields owned by different growers. We do not know the reason for these control failures. However, Flint is a strobilurin and fungicides based on this chemistry can be very susceptible to the development of resistance. Remember to rotate Flint (and other Strobilurins) with DMI's (Folicur or Rally) and/or products with other chemistries/modes of action such as Serenade, sulfur, & oils.
Powdery Mildew In Hops
Hops none
Posted on: June 27, 2001 by Jerry Neufeld
Jim Barbour, U of Idaho Specialist at Parma reports powdery mildew was found on hops in Canyon Co. The infected plants were in a field of Zeus hops that had been infected with powdery mildew last year.
This is the first time that an Idaho hop field has been found with powdery mildew two consecutive years. The cool dry weather we have been having lately is ideal for the powdery mildew fungus. Growers should scout fields of susceptible hops once weekly and treat immediately if powdery mildew is found.
Lygus Bug Hatch
Alfalfa Seed none
Posted on: June 25, 2001 by Ben Simko
A Lygus bug hatch was oberved in alfalfa seed fields near Cairo Junction, Ontario. These fields were treated with a clean up tank mix of Capture and dimethoate on June 4. The hatch is moderate size averaging 5-7 total nymphs per sweep. Third instar nymphal stage dominates the population as of sweep samples taken Sunday June 25. As residual control from clean up sprays wanes, growers and fieldmen are advised to check fields weekly or semi weekly to detect first bloom period hatches and schedule timely insecticide applications.
Green Peach Aphids on Potatoes
Potato All Locations
Posted on: June 11, 2001 by Brad Geary
Green peach aphids have been found at the Parma Research and Extension Center in aphid traps, at local nurseries, and in potatoes in home gardens. The numbers have been low, but they are out there. If you have not started scouting your fields please start.
sugarbeet root maggots
Sugarbeets none
Sugarbeet Root Maggot
Posted on: June 8, 2001 by Jerry Neufeld
Sugarbeet root maggots are invading fields in the following areas: 1)Notus, 2) South of Owyhee River in Oregon, 3)Parma/New Acres. Amalgamated Sugar Company Representatives say it is the worst infestation in many years.
Loopers in Mint
Mint none
Posted on: June 6, 2001 by Jerry Neufeld
Cabbage loopers are damaging mint fields in the Nampa area. Loopers have a high mortality rate due to parasites and diseases, but can do a lot of damage when high populations exist. At this early part of the season, a healthy stand of mint can take some looper damage and recover. Most loopers observed on 6/5/01 were in the 2nd and 3rd instar, and have a lot of growing to do yet. Information provided by Thad Schutt of AM Todd.
Sugarbeet Root Maggot
Sugarbeets none
Posted on: June 5, 2001 by Jerry Neufeld
Sugarbeet root maggot feeding is taking place in fields south of Nampa. Problem is worse in fields that have been replanted. Phil Allison from Producers Supply Coop and Eddie Martineau are postulating that in the replanted fields one of two things may be happening. 1) the band of insecticide that was used at planting was disturbed during the replanting process and effectively diluted; 2) the replanted seeds were not placed back into the original band of insectcide. Some field investigations between fields that weren't replanted and fields that were replanted appears to support this. Now is the time to closely watch your replanted sugarbeet fields for sugarbeet root maggot.
Sugarbeet root maggot
Sugarbeets none
Posted on: June 5, 2001 by Bruce Hunter
There have been a number of fields in the Nyssa area with root maggot problems. Some of these fields had an at planting insecticide application, but poor spring moisture failed to activate the materials. Furadan is being applied as a rescue treatment.
Cereal Leaf Beetle
All Crops none
Posted on: June 5, 2001 by Ben Simko
Cereal Leaf Beetle(CLB) infestations continue to plague growers in the Adrian OR area according to Bruce Hunter, of Nyssa Co-Op Supply. Three spring wheat or barley fields were treated recently for yield limiting infestions of CLB larvae defoliating flag leaves. The links at the CLB resource page provide growers and fieldmen more details on life cycle information, treat levels, and insecticide recommendations.
cereal leaf beetle
All Crops none
Posted on: June 4, 2001 by Steven Reddy
Cereal Leaf Beetle has been found in spring planted wheat in the Sunnyside and Weiser River areas of Washington County.
Colorado Potato Beetles
Potato none
Posted on: June 1, 2001 by Lynn Jensen
Colorado potato beetles have been observed laying eggs on nightshade in the Nampa area. Any potato fields not treated with a systemic insecticide should be scouted for beetle damage as the larvae hatch and begin feeding.
Painted Lady Butterfly Caterpillars
Mint none
Posted on: June 1, 2001 by Jerry Neufeld
Infestations of painted lady or thistle butterfly caterpillars are damaging mint in the Dry Lake area. The 2001 PNW Insect Management Handbook does not recommend treatment unless there are at least one caterpillar per square foot. Treament decision should also take into account the price of mint.
Sugarbeet Root Maggot
Sugarbeets none
Posted on: June 1, 2001 by Jerry Neufeld
Sugarbeet Root Maggots are feeding on beets in many fields south of Nampa. Problem seems to be most severe in fields that were replanted due to the frost. Information provided be Producers Supply Coop.
Cereal Leaf Beetle
All Crops none
Posted on: May 29, 2001 by Jerry Neufeld
CLB larvae are beginning to emerge from eggs laid earlier this spring. Early instar CLB larvae are observed infesting and causing feeding damage in spring grain fields west of Kuna. Spring barley and oats are the favored host crops of this insect. Growers are advised to continue monitoring spring planted grains and take appropriate management steps if larval feeding damage exceeds economic thresholds.
