Evaluation on the effects of several chemical fungicides for control of Botryosphaeria dothidea
In order to solve the problem of Botryosphaeria dothidea on resistance to traditional fungicides,bio-assay tests were made for 6 fungicides including 10％ water-dispersible granules of difenoconazole, 250 g·L~(-1)azoxystrobin suspension concentrate etc.against B.dothidea in laboratory.Field tests of these fungicides with different concentrations were made for control of the disease on apple trees.The results showed that except water-dispersible granules of 50% kresoxim-methyl, the other fungicides expressed stronger inhibitory effects against mycelium growth than that of 70% mancozeb wettable powder.10％ difenoconazole water dispersible granules showed the highest toxicity with ECho of 0.017 mg L~-1 In the field tests,250 g·L~(-1) azoxystrobin suspension concentrate at the concentration of 800 times concentration was the best one for control of this disease at harvest stage, with effectiveness of 92.39% ; and after stored for 15 and 30 d effectiveness reached 100% and 98.59%.These tests provided a sound basis for fungicide registration and for choice of suitable fungicides for control of B.dothidea in apple production.
国家科技期刊平台
NSTL
万方数据
维普
