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Fungicides, including Topsin M, Rovral, Ronilan, Ridomil/Bravo, TD 2350-1, CGA 219417, and a combination of Topsin M and TD 2350-1, were evaluated for control of  Botrytis allii  in a commercial field of hard, yellow, seed onions near Madras, Ore. The 10 × 25-ft split-plots were replicated three times in a randomized complete block design, with half the plot planted with Topsin M-treated seed prior to planting. Plots received a single fall fungicide application on 30 Sept. 1994, and two spring applications on 3 May and 13 May 1995. Stand counts were taken 4–6 Nov. 1994 and 21 Apr. 1995 to evaluate reduction in plant population over winter. Three row-foot of plants grown from untreated seed were removed and examined for lesions and sporulation 15–19 June 1995. Thirty-plant samples were taken from both plots with treated and untreated seed 17–21 July 1995. Botrytis was considered present if lesions plus sporulation were observed on the bulb at the time of sampling, or if sporulation developed on previously non-sporulating lesions within 3 days of storage in plastic bags at room temperature. A visual rating of plants that remained standing due to adequate root systems was conducted 24 July 1995. Bulb evaluation of non-seed-treated plots on 15–19 June indicated significant control of botrytis with TD 2350-1 over plots not receiving foliar fungicide application. Evaluation of non-seed-treated plots on 17–21 July indicated Topsin M, TD 2350-1, and a combination of the two fungicides provided significant disease control compared to plots without foliar application of fungicides. There were no significant differences between fall and spring stand counts, or between treated and untreated seed.

EVALUATION OF FUNGICIDES FOR CONTROL OF BOTRYTIS SOIL LINE ROT IN SEED ONIONS