Abstract:

To screen better effective biological fungicides on the main diseases of potato in the dry farmland and rotation paddy-upland crop field by the soil treatment during sowing, the control effects of 5 biological fungicides (Bacillus subtilis, amino oligosaccharide, polymycin, pythium and horseradish) on potato early blight, late blight and scab were investigated. The results suggested that the effects of horseradish and amino oligosaccharide on early blight were the best and higher than 60% in the two types of plots, the effects of polymycin and amino oligosaccharide on potato late blight were the best and higher than 40% and 25% in the dry farmland and rotation paddy-upland crop field, respectively, and the effects of Bacillus subtilis and amino oligosaccharide on potato scab were the best and higher than 80% and 25% in the dry farmland and rotation paddy-upland crop field, respectively. The overall control effect of each pesticides in dryland was better than that in rotation paddy-upland crop field.

Key words: potato disease, soil treatment, biological control, field trial