Affeldt, Rich

Evaluation of Late-Season Bactericide Applications to Reduce Xanthomonas hortorum pv. carotae on Harvested Carrot Seed

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Series/Report number: 
COARC2014
Abstract: 
and Phyton 27 AG for the suppression of Xanthomonas hortorum pv. carotae (Xhc) on harvested carrot seed. Bactericide applications were made in late August one to two weeks before harvest in each of two fields, and harvested seed from the plots was assayed by plating dilutions of seed washes onto a semi-selective agar medium. Seed assays were conducted in parallel by two labs. A significant (P = 0.0008) reduction in Xhc populations on harvested seed was observed in one of the two fields, but only for seed tested in one of the two labs. In general, both treatments reduced Xhc levels on harvested seed compared to the control plots but not to the extent that would reduce the need for hot water seed treatment.

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.

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.

Evaluation of Late-Season ManKocide Applications to Reduce Xanthomonas hortorum pv. carotae on Harvested Carrot Seed

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Series/Report number: 
COARC2015
Abstract: 
Field plots were established to evaluate the efficacy of late-season applications of ManKocide for the suppression of Xanthomonas hortorum pv. carotae (Xhc) on harvested carrot seed. Two ManKocide applications were made in mid to late August 2014 in each of two fields, and harvested seed from the plots was assayed by plating dilutions of seed washes onto a semi-selective agar medium. Late season applications of ManKocide did not significantly reduce Xhc populations on harvested seed in this study.

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.

Foliar Boron Fertilizer Application and Timing in Hybrid Carrot Seed Production

Hybrid European Nantes carrot seed production can be challenging for growers as yields can be unreliable. Demand for boron (B) in many crops is greatly elevated during flowering and seed set even when B in the plant leaves are in the “adequate” range for that crop. Several studies have found that foliar B applications can increase fruit set and yield (Nyomora et al,. 1999; Perica et al., 2001; Asad et al., 2003). Research conducted on alfalfa seed found that foliar B applications increased seed yield even though B concentrations in the plants and soil were considered adequate for alfalfa forage production (Dordas, 2006). The objective of this research project was to determine what effect foliar B application and application timing had on hybrid carrot seed production.
Series/Report number: 
COARC2016
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