Cucurbit monosporascus root rot is a serious disease of melons, and to a lesser extent other cucurbit crops. The pathogen can live in soil for a number of years, making cucurbit monsporascus treatment difficult. Symptoms are not usually visible until near harvest time. Plants turn into yellow, wilt and leaves die back. As the disease progresses, the entire plant dies prematurely. The roots infected with cucurbit root rot will have black perithecia visible in the root structures that appear as small black swellings. Fungicide treatments applied just at plant emergence have been shown to be affective at controlling Monosporascus root rot of cucurbits.

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Source: Gardening Know How