All Alfalfa Alerts
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Weevil in Forage Alfalfa
Alfalfa Northern Idaho
Weevil
Posted on: April 20, 2016 by Bill Buhrig
Weevil are being found in forage alfalfa fields in Malheur County. They are more likely to be approaching damage thresholds in older stands. Please refer to the attached link for more information and work with your crop consultants to determine if a treatment is necessary. Be aware of pre-harvest intervals and how they may interfere with your timing when swathing first cutting. In some instances, swathing may make more sense than applying a plant protectant product.
» http://insect.pnwhandbooks.org/hay-pasture/alfalfa/alfalfa-hay-alfalfa-weevil
Training for use of ZINC PHOSPHIDE CONCENTRATE
Alfalfa Northern Idaho
Belding Ground Squirrel
Posted on: February 3, 2016 by Stuart Reitz
Laurie Gordon from ODA will conduct the required training class for those in BAKER, CROOK, HARNEY, KLAMATH, LAKE, and MALHEUR COUNTIES OREGON who would like to use Zinc Phosphide concentrate for Belding Ground Squirrel control in alfalfa and mixed grass/alfalfa fields. This is for zinc phosphide used with cabbage bait.
The training will be Feb. 17, from 1-3 PM at the Four Rivers Cultural Center, 676 SW 5th Ave., Ontario, OR.
Please note that this training is required every year before you may purchase, mix or apply this zinc phosphide product.
Please contact the Malheur County Extension office 541-881-1417 / stuart.reitz@oregonstate.edu to reserve a space. There is no charge for the class.
Weevil in alfalfa
Alfalfa Treasure Valley - Oregon
Alfalfa weevil
Posted on: April 28, 2015 by Bill Buhrig
Alfalfa weevil are at or approaching threshold levels for treatment in forage alfalfa fields around the western Treasure Valley. Older stands are more likely to see increased pressure when compared to younger fields. Proper scouting in addition to working with your field consultants will help determine the need for treatment. Be aware of pre-harvest intervals restrictions of the products you may use. Check out the attached link from the PNW Insect Management Handbook for more information on treatment threshold and options.
» http://insect.pnwhandbooks.org/hay-pasture/alfalfa/alfalfa-hay-alfalfa-weevil
Weevil in alfalfa
Alfalfa Treasure Valley - Oregon
Weevil
Posted on: May 5, 2014 by Bill Buhrig
Alfalfa weevil are being found in forage alfalfa fields in Malheur County. They appear to be most prevalent in fields with older stands. Some fields have already been treated. Control options include applying an insecticide or harvesting the crop before damage becomes too great. If insecticides are used, be aware that the pre-harvest interval may be up to three weeks depending on the product used. Utilize proper scouting procedures in conjunction with your crop consultant to determine if you are approaching the economic damage threshold and what options for control may be best for your situation.
For more information on this pest, please check out the attached link from the Pacific Northwest Insect Management Handbook.
» http://pnwhandbooks.org/insect/hay-pasture/alfalfa/alfalfa-hay-alfalfa-weevil
Army Cutworm Infestation
Alfalfa Treasure Valley
Army Cutworms
Posted on: April 15, 2014 by Bill Buhrig
Ranchers in Owyhee County from south of Homedale (Jump Creek area) down to the Rome area in Malheur County are reporting widespread damage to alfalfa and rangeland grasses by an infestation of army cutworms (Euxoa auxiliaris). These cutworms are ½” to 1 ¼ “ long, are brown to black in color with light colored stripes (picture attached) and may be seen in protected areas such as under cowpies, alfalfa crowns or just underneath the residue layer remaining from last season’s foliage. If you suspect army cutworms, lightly pull back the residue layer about 1” deep and look under cowpies where available. They appear to come off the rangeland fringe into alfalfa fields creating a banded effect similar to what ground squirrels may do this time of year. Crested wheat seedings in BLM allotments have also been damaged (pictured). Ranchers wishing to implement control measures on their irrigated fields can use chlorpyrifos (Lorsban 4E) or a mixture of chlorpyrifos and pyrethroid such as Cobalt at labeled rates. Cutworms are reported to come up at night in some areas so it important to use an insecticide that will be effective by ingestion to be available when the cutworm comes up to feed. For more information, check out the PNW Guide (linked). Big hat tip to Sergio Arispe and Stuart Reitz for their help with this posting!
» http://pnwhandbooks.org/insect/hay-pasture/alfalfa/alfalfa-hay-cutworm
Alfalfa cutworms
Alfalfa Magic Valley
Cutworms
Posted on: March 25, 2014 by Jeff Miller
Cutworm damage has been observed in newly seeded alfalfa in the Magic Valley. Details on this pest and control measures can be found by following the attached link.
alfalfa pests
Alfalfa Treasure Valley - Oregon
aphids, weevils, lygus
Posted on: May 17, 2012 by Jerry Neufeld
Dr. Clint Shock, Superintendent at the OSU Malheur County Experiment Station is reporting that lots of aphids, weevils, and lygus are being found in alfalfa hay fields near Nyssa and Vale. Oregon.
clover root curculio in forage alfalfa
Alfalfa Magic Valley
clover root curculio
Posted on: May 3, 2012 by Jerry Neufeld
Below is information about Clover Root Curculio in forage alfalfa. The information is being provided by Dr. Erik Wenninger, UI Extension Entomologist and Dr. Glenn Shewmaker, UI Extension Forage Specialist. Both are located in Kimberly, Idaho.
There are a lot of questions about clover root curculio in forage alfalfa, but not a lot of information.Review the attached pdfs, especially the CRC fact sheet attached for more information. There isn’t a lot of new information about this pest, the entomologists who have worked on this have all retired.
Considerations for management of clover root curculio:
1. There are no registered pesticides for control of the larval stage of clover root curculio on alfalfa forage.
2. There are pesticides registered for use against adults on alfalfa forage, but adulticides are not likely to provide effective control because adults move readily among fields and are active over a long time period. The larval stage is most damaging.
3. Larvae produce the most damage and usually it is a year later that you see the symptoms in the early spring after alfalfa breaks dormancy.
4. Symptoms of CRC larval feeding damage are:
a. Patches of slow, dormancy-breaking alfalfa, sometimes related to irrigation management and drought. Drought exacerbates the water and nutrient uptake in alfalfa because of the trimming of fine roots in alfalfa and feeding on the nodules which reduces N fixation temporarily.
b. Individual weak plants with the patches, with some more healthy appearing plants side by side.
c. Scoring and girdling of alfalfa roots by the later stages of larvae.
5. Recommendations for control:
a. Since no pesticides are registered, we must rely on cultural control methods.
b. Rotation is the key method.
i). Rotation of an alfalfa field to a non-host crop (i.e., any crop other than alfalfa or clover) will eliminate larval food sources and discourage adults from laying eggs in the soil.
ii). New alfalfa fields should be planted as far away as possible from existing alfalfa fields, especially those with confirmed CRC infestations.
c. New plantings made during the spring may be less susceptible to CRC than those made during the fall, since many spring-planted alfalfa emerges towards the end of adult CRC activity, and should have a year of growth before it might be attacked by CRC larvae. Fall-planted alfalfa will have less time to mature before potential attack the following spring, and may also be more susceptible to possible attack by adults during fall establishment.
d. Our variety trials have not been directly assessed for CRC resistance, but most alfalfa breeders don’t think there are any resistant varieties identified, and no one seems to directly select for resistance to CRC.
e. Irrigation and fertility management will reduce the negative effects of CRC root damage. Although N application to provide N to nodule-affected plants is probably not economical since that condition seems to be very temporary.
f. The studies from Montana do not show consistent benefit from (UNREGISTERED FOR CRC) Furadan, although adult CRC numbers were reduced.
g. CRC larvae control would be difficult.
6. ID of adults and larvae
a. Damage by adults on the alfalfa leaves can be found occasionally, and relatively small numbers of adults have been found at Kimberly. Damage by adults is not likely to be economical unless heavy infestations attack newly planted alfalfa during the fall.
b. Larval damage has been observed throughout Idaho and extensively in the Kimberly area.
c. We have not been able to ID or find larvae in spring at Kimberly, although timing of looking for larvae and depth in the soil are a guess.
Downey MIldew
Alfalfa Magic Valley
Downey MIldew
Posted on: June 21, 2010 by Jerry Neufeld
Downey Mildew on Alfalfa was observed in the Rupert area. Cool and humid conditions are conducive to the development and spread of Downy Mildew. Initial symptoms include chlorotic tissue either as localized areas on leaflets or entire leaves and stems if infection is progressing. Infected leaves can show symptoms of twisting and/or curling of the leaf margin. Lower leaf surfaces will show white to pale violet down growth. Fungus needs near 100% relative humidity to reproduce and is spread primarily by wind and splashing rain. Disease cycle can be repeated every 5 days depending on environmental conditions. Please consult the PNW handbook pdf below for control alternatives.
This information was provided by UI Extension Plant Pathologist Dr. Oliver Neher.
Alfalfa Weevil
Alfalfa Treasure Valley - Oregon
Posted on: May 6, 2009 by Steve Norberg
May 6, 2009 by Steve Norberg
Be sure to be scouting alfalfa weevil as numbers are increasing and I have seen fields with some damage.
Pest description and crop damage Larvae are about 0.375 inch long, yellow to green, with a white stripe down the back. They feed in and on the buds and leaves of alfalfa.
More information and control recommendations can be found at 2009 Pacific Northwest Insect Guide information on alfalfa weevil can be found at:
http://www.tvpestalert.net/admin_add.php
http://uspest.org/pdf/reb90.pdf
Alfalfa
Alfalfa Treasure Valley - Idaho
Posted on: April 20, 2009 by Jerry Neufeld
Brad Chamber from Pioneer Hi-Bred is reporting that cutworms have been working Treasure Valley fall and spring seeded alfalfa seed fields for the past couple weeks, growers need to be diligent in scouting for them. If the field doesn’t “green up”, there may be a cutworm problem.
Also, pea leaf weevils have been doing some damage on spring seeded alfalfa seed fields. They are capable of “notching or removing” the cotyledons of the newly sprouted alfalfa resulting in stand mortality.
Below is a pdf with information from the 2009 PNW Insect Management Handbook on how to control these pests.
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.
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.
Western Yellowstriped Armyworm
Alfalfa none
Posted on: August 7, 2002 by Steven Reddy
Western Yellowstriped Armyworm has been reported in new seeded, second cutting alfalfa east of Weiser. Numbers have been high enough in some fields to cause defoliation and have required treatment. Armyworms rest at night but can be seen feeding and moving during the day.
alfalfa weevil
Alfalfa none
Posted on: June 7, 2002 by Jerry Neufeld
Heavy populations of alfalfa weevil are being found in alfalfa hay fields south of Nampa and in the Kuna area. This information provided by Landview Fertilizer.
spotted alfalfa aphid
Alfalfa none
Posted on: June 6, 2002 by Jerry Neufeld
Spotted alfalfa ahpids are being found in new alfalfa hay seedings and alfalfa seed fields south of Nampa at levels requiring treatment. Producers Supply Coop.is reporting this information.
Alfalfa Weevil Infesting Hay Fields
Alfalfa All Locations
Posted on: May 15, 2002 by Ben Simko
Alfalfa weevil infestations are causing varying degrees of damage to many hay fields in Malheur County. Tim Kurth, Farmers Supply Coop has reported treatable levels of alfalfa weevil in several fields in the Vale area and assisted growers on management decisions. Hay growers are advised to check their fields now to assess weevil infestation levels and decide if treatment is necessary. Weather conditions, plant vigor, irrigation schedules, cutting date, previous history of weevils in the fields are all important factors to determine if treatment is justified. See the Alfalfa Weevil Reference page (click on More information….) for IPM resources.
