Growth ofSclerotinia minoron Media Containing Chlorothalonil and Benomyl

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Abstract
Radial growth of S. minor was strongly inhibited on potato-dextrose agar containing benomyl at 1-2 .mu.g/ml. This sensitivity of S. minor to benomyl was not affected by the physiologic age of mycelium when transferred to amended media. Radial growth was inhibited on media containing chlorothalonil at 0.5-128 .mu.g/ml, but sectors of rapidly growing mycelium developed at irregular points on the periphery of colonies. Inhibition of radial growth on media amended with chlorothalonil was directly related to physiologic age of mycelium at time of transfer. Growth was inhibited when mycelium was transferred from colonies of S. minor that had begun to differentiate sclerotia, but growth was not inhibited when mycelium was transferred from colonies that had not begun to differentiate sclerotia. The insensitivity of vegetative mycelium of S. minor to chlorothalonil may help to explain the increased severity of Sclerotinia blight in peanuts [Arachis hypogaea] treated with this fungicide.

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