新杀菌剂对番茄灰霉病菌的室内毒力及田间防效

室内采用菌丝生长速率法、孢子萌发法和黄瓜子叶法测定了咯菌腈、抑霉唑、福美双、吡唑醚菌酯和嘧霉胺对番茄灰霉病菌( Botrytis cinerea)的抑制作用。结果表明，菌丝生长速率法和孢子萌发法的测定均以咯菌腈毒力最高，EC 50分别为0.005 2 μg/mL和0.087 6 μg/mL；黄瓜子叶法测定以抑霉唑毒力最高，其EC 50为0.675 3 μg/mL。田间药效试验结果表明：50%咯菌腈可湿性粉剂90 g/ hm2对番茄灰霉病的田间防效达到90%以上，显著高于对照药剂50%啶酰菌胺水分散粒剂300 g/hm2和40%嘧霉胺悬浮剂 480 g/hm2的防效。

Fungicidal activity of new fungicides against Botrytis cinerea and their field efficacy against tomato grey mould

Inhibitory activity of fludioxonil, imazalil, thiram, pyraclostrobin and pyrimethanil to Botrytis cinerea was tested by conidial germination test, mycelial growth rate test and cucumber cotyledons spray inoculation test, respectively. It was found that the inhibitory activity of fludioxonil was the highest both in conidial germination test and in mycelial growth rate test. Their EC50 values were 0.005 2 and 0.087 6 μg/mL, respectively. The inhibitory activity of imazalil was the highest in cucumber cotyledons spray inoculation test, and its EC50 value was 0.675 3 μg/mL. The results of field efficacy trials showed that field efficacy of fludioxonil 50% WP was above 90% and obviously higher than that of the control fungicides, boscalid 50% WG and pyrimethanil 40% SC, when the treatment concentrations were 90, 300 or 480 g/hm2.