On-farm inquiry and assessment of tillage and cover cropping for white mold control in snap bean production Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qb98mh56h

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  • Cultural practices in snap bean production were evaluated at the Oregon State University Vegetable Research Farm Corvallis, Oregon. In addition, decision-making in snap bean production was assessed on five farms in the Coburg-Junction City-Harrisburg regions of the Willamette Valley, Oregon. A field experiment with cover crop and tillage techniques was evaluated for the reduction of sclerotia within soil and white mold incidence (Sclerotinia sclerotiorum Lib. de Bary) on snap bean {Phaseus vulgaris) vegetation and pods. The experimental design was a restricted, randomized strip plot with four replications. Cover crops were planted in early May. Mesh sacks containing 10 sclerotia were buried at 5cm depths. The cover crops were suppressed mid-June with glyphosate. Half of the total sclerotia were removed to assess viability. The remaining sclerotia in the tillage plots were removed to avoid tillage applications and replaced following snap bean planting. Plots were planted with 'OR 91G' snap beans in early July. At harvest, whole plants were assessed for yield, root health whole plant white and gray mold, and mold on pods. Sclerotia were removed following harvest and assessed for viability on select basal media (SBM). Fallow and broccoli treatments resulted in the greatest yield and amount of whole plant and pod white mold. Sclerotia counts did not vary amongst treatments. Sclerotia number decreased to less than 10% of initial inoculum level at harvest. Five growers participated in yearly interviews and the assessment of a white mold scouting tool. Over three years, no change in farming practices was detected. Impressions of white mold disease pressure changed, however. In 1996, 85% of the interviewed growers rated white mold as the overall, most severe pest in snap beans. In 1998, 25% rated white mold as the most severe pest. Ronilan fungicide was registered in early 1998; therefore, concern regarding white mold control improved.
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