[Effect of pesticides on field-controlling root rot of Vicia faba].

The effect of pesticides on field-controlling root rot of Vicia faba was studied in two consecutive years by seed treatment of fungicides and their combination. The results of the first year field experiments showed that among the 11 treatments tested, triadimefon of 0.01 g a.i.kg-1 seeds was more effective than other fungicides applied singly or in combinations. The other test fungicides included thiophanate-methyl, thiram, oxadixyl and metalaxyl. Compared to the control, triadimefon treatment reduced the root rot index of 6-week-old seedlings by 51.5%, and plant accumulated percent mortality by 36%. Consequently, the treatment increased seed yield/plant by 21% and seed yield/ha by 97.6%. In the trials carried out in the following year, the plant percent mortality was reduced by 31.9% and seed yield increased by 19.6% under triadimefon seed treatment. It is demonstrated that seed treatment by triadimefon effectively controlled root rot, promoted plant growth, and increased seed yield of faba bean in the fields.