Chemical Control ofSclerotium rolfsiion Golf Greens in Northern California

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Abstract
Eruptive and hyphal germination of dried sclerotia of 2 isolates of S. rolfsii on 1% Noble and Bacto water agar was totally inhibited by carboxin, cycloheximide, oxycarboxin and experimental fungicide CGA-64251 in the agar at rates of 100 and 200 .mu.g a.i.[active ingredient]/ml. None of the compounds, however, was fungicidal. Cadmium succinate, captan, chlorothalonil, thiophanate-methyl with Zn ion and manganese ethylenebisdithiocarbamate, mancozeb, pentachloronitrobenzene alone or with fertilizer, and furmecyclox in agar reduced germination of sclerotia by 80-95%. Benomyl, 2,6-dichloro-4-nitroaniline, thiram, triphenyltin hydroxide, vinclozolin and experimental fungicide MF-647 had no significant effect on sclerotial germination. Applications of 2,6-dichloro-4-nitroaniline and cycloheximide in combination, captan, carboxin, pentachloronitrobenzene with fertilizer, ammonium bicarbonate, and ammonium sulfate controlled S. rolfsii under natural conditions when applied at 14-day intervals over a 3.5-mo period. Fungicides and nitrogenous compounds such as ammonium bicarbonate used separately or in combination may control S. rolfsii on turf.

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