Martens, Bruce

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

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Series/Report number: 
COARC2014
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. This preliminary project was conducted to determine if there is potential for the use of predator mites in carrots. Circumstantial evidence from the results suggests predator mites were successfully established, they were successful in reducing TSSM populations, they were able to effectively disperse throughout the field, predators can be introduced in the fields with moderate amounts of TSSM and they may be able to keep populations at a commercially acceptable level.

Evaluation of Miticides for Two-Spotted Spider Mite Control in Carrots Grown for Hybrid Seed in Central Oregon

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Series/Report number: 
COARC2014
Abstract: 
Two-spotted spider mites (TSSM) are an important pest on hybrid carrot seed production in central Oregon. Concern about the two-week knock down period and re-entry interval (REI) for Comite (propargite) prompted a search for other products that could be used. Plots were established in two commercial fields in central Oregon. All treatments generally provided greater control than the untreated check, with statistical differences between treated and untreated plots at one location. The trend was for Agri-Mek (abamectin) to provide similar results to Comite and Oberon (spiromesifen) and to sometimes provide greater control of TSSM than Comite.

Incidence, Resistance, and Evaluation of Chemical Controls for Bacterial Soft Rot in Carrot Stecklings

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Series/Report number: 
COARC2015
Abstract: 
Bacterial soft rot, caused by Pectobacterium spp. (formerly Erwinia carotovora), can be an important disease of certain carrot steckling lines used for hybrid carrot seed production. In surveys conducted in two hybrid Kuroda steckling-to-seed carrot seed fields in Jefferson County, OR during the summer of 2014, between 22 and 43% of female plants exhibited soft rot symptoms. A follow-up survey in 2015 observed between 19 and 27% of female plants with soft rot symptoms. It has also been observed that symptoms in the field are more severe on the female line compared the male line. The objectives of this study were to: 1) quantify the incidence of soft rot infection in stecklings used for hybrid seed production; 2) determine if the male line is more resistant to soft rot than the female line; and 3) test the efficacy of chemical treatments to reduce losses caused by soft rot.

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.

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.
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