Abstract

Coniothyrium minitans Campb. is pathogenic to Sclerotinia trifoliorum Erikss., the causal agent of clover rot. It is recorded for the first time in England and its natural distribution on sclerotia of S. trifoliorum. is studied. Experiments are described on artificial infection of buried sclerotia by C. minitans applied to soils as spore suspensions or mixed with them as cornmeal-sand preparations. A cornmeal-sand culture, mixed intimately with either a loamy sand or a heavy clay, killed 85–99% sclerotia within 11 weeks. The soils remained highly infective for at least 14 months. The possibilities of C. minitans for control of clover rot are discussed.

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