Butler, Marvin

Electronic Mint Pest Alert Newsletter to Promote Optimal Application of Coragen® to Control Mint Root Borer, Cutworms, Armyworms and Loopers

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Series/Report number: 
COARC2015
Abstract: 
An electronic newsletter was developed for the peppermint production regions in Oregon to assist growers and fieldmen consider control of mint root borers, cutworms, armyworms and loopers during the growing season prior to crop damage. The newsletter was designed as a two-year project to help with timing of this new insecticide application strategy, and to be used in conjunction with existing field monitoring programs. Extension Agents from the Willamette Valley and Union County were valuable cooperators and provided scouting services to confirm insect development model accuracy. A formal survey of those receiving the newsletter indicates that the newsletter was well received, provided information valuable to growers and crop consultants/scouts, and respondents would overwhelmingly like to see the newsletter continue.

Evaluate Potential Crop Injury from Herbicides Applied the Final Year of Peppermint Production when Rotating to Kentucky Bluegrass Seed or Wheat

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Series/Report number: 
COARC2015
Abstract: 
There have been ongoing concerns by growers and fieldmen in about herbicides used in peppermint production carrying over when rotating into Kentucky bluegrass or winter wheat. Symptoms generally appear as Sinbar damage despite lowered rates later in production years with no Sinbar applied the final year of production. Of concern is whether alternative herbicides used in the final year or two in combination with Sinbar is creating a synergistic effect that is causing the observed damage. A research project was established to evaluate four herbicides applied alone and in various combinations to address these concerns. As of early December, no observable effect of these twenty herbicide treatments on Kentucky bluegrass or winter wheat stands has been observed.

Layby Herbicide Treatments to Control Weeds During Row Closure in Sugar Beets Grown for Seed

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Series/Report number: 
COARC2015
Abstract: 
Sugar beets grown for seed in central Oregon is a small, established industry. Weed control in sugar beets is dependent on precise application timings early in weed development for adequate control while minimizing crop damage. This project was designed to evaluate layby herbicide applications to extend weed control during row closure and minimize the need for hand weeding. Outlook at 18 oz/acre plus Nortron at 16 oz/acre provided the best control at 75 percent. There was a broad spectrum of weed species in the plot area, with common lambsquarter, hairy nightshade, redroot pigweed and knotweed included on the herbicide labels that were tested.

Evaluation of Predator Mites for Control of Two-Spotted Spider Mites in Carrots Grown for Hybrid Seed in Central Oregon, 2015

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Series/Report number: 
COARC2015
Abstract: 
Two-spotted spider mites (TSSM) are an important pest on hybrid carrot seed production in central Oregon. Predator mites have been used to successfully control TSSM in peppermint production in central Oregon and a preliminary project on carrots grown for seed conducted in 2014 indicated that there is potential for use of predator mites in carrots. Results from 2015 indicate that predator mites were successfully established at all locations in non-Zeal and Zeal-treated plots, the combination of Zeal and predator mites held TSSM populations below the treatment threshold, while the late application of predators alone was unable to keep TSSM populations in check in the non-Zeal plots.

Electronic Mint Pest Alert Newsletter Regarding Control of Mint Root Borer, Cutworm Complex and Loopers (Year 3)

Series/Report number: 
COARC2016
Abstract: 
An electronic newsletter was developed for the peppermint production regions in Oregon to assist growers and fieldmen consider control of mint root borers, cutworms, armyworms and loopers during the growing season prior to crop damage. Recommendations of optimal insecticide application timing were based on the insect development models, and were provided through weekly e-Newsletters in each region from mid-June until the end of July. Extension Agents from the Willamette Valley, Central Oregon, and Union County provided scouting services to confirm insect development model accuracy. A formal survey of those receiving the newsletter indicates that the newsletter was well received, provided information valuable to growers and crop consultants, and respondents would all like to see the newsletter continue.

Evaluation of Potential New Insecticide in Carrots for Lygus Control

Series/Report number: 
COARC2016
Abstract: 
Lygus bugs feeding on carrots grown for seed during flowering and seed maturation reduce seed viability. Potential new insecticides for control of lygus in carrots were evaluated in alfalfa and carrots plots at the Central Oregon Agricultural Research Center (COARC). Sulfoxaflor (Transform) and flupyradifurone (Sivanto) were compared to the industry standard, naled (Dibrom 8) plus lambda-cyhalothrin (Warrior II) and an untreated check. Although Transform was effective one week after application, Dibrom 8 plus Warrior II was the only effective treatment compared to the untreated check in subsequent evaluations and across the three sampling dates.

Evaluation of Potential New Insecticides and Fungicides for Honey Bee Repellency in Seed Carrots

Series/Report number: 
COARC2016
Abstract: 
To insure honey bee safety during crop pollination, potential new products were screened for bee repellency. This research was conducted in a carrot steckling field at the Central Oregon Agricultural Research Center (COARC). Bee visits were counted beginning one day after bees were brought into the field and continued for a total of four counts. There was no statistical difference between treated and untreated plots, indicating no detrimental effect on bee activity from these products.

Evaluation of Potential New Herbicides in Carrots Applied as a Directed Spray at Layby

Series/Report number: 
COARC2016
Abstract: 
Weed resistance to ongoing use of Lorox in carrots grown for seed is a concern to industry representatives and growers. This project was established to evaluate two new products compared to current industry standard treatments. Spartan (sulfentrazone) is used in peppermint production and there is local knowledge about the spectrum of weed that it is effective on. Results from a directed spray application at layby indicate that it may provide a good fit in carrot seed production.

Evaluation of Herbicides for Control of Rough Bluegrass, Cheatgrass, Rattail Fescue and Medusahead in Establishment Year and Second Year Kentucky Bluegrass Grown for Seed

Series/Report number: 
COARC2016
Abstract: 
Adequate weed control during the establishment year of Kentucky bluegrass seed production is a challenge, particularly for grassy weeds in a grass crop. This project is a second-year project to evaluate innovative ways to use currently registered products to accomplish this goal, focusing on rough bluegrass, cheatgrass, rattail fescue and medusahead. Treatments and application timings include Callisto pre-emergence between planting and first irrigation, Beacon applied at 0.19 oz/acre, with and without Bronate at 1 pt/acre, at the 2-3 leaf and 4-5 leaf stages, and Beacon at the split application rate of 0.38 oz/acre during a October/November timing. Potential new herbicides, Fierce, Alion and Sharpen were evaluated in a second year stand for control of the same four grassy weeds and for crop safety, compared to two current industry standards. Application timings were pre-emergence and during October/November. Results from establishment year plots indicates significantly less stunting of Kentucky bluegrass when Beacon is applied at 2-3 leaf rather than the 1-2 leaf stage as was done during 2015. Bronate appears to be an effective crop safener when added to Beacon at either 2-3 leaf or 4-5 leaf stages, with similar control of the grassy weeds.
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