[Allelopathic effect of extracts from mono-cropped soil on its root rot pathogens].

Methanol, ethyl acetate, and water were used to extract the continuous cropping soils of , with the solution/soil ratios of 3:1, 6:1, and 9:1. We investigated the effects of those soil extracts on the growth and population of root-rot pathogens of . Results showed that the methanol, ethyl acetate and water extracts all promoted mycelial growth of and after 72 h of plate culture.