4种杀菌剂对设施瓠瓜灰霉病的防效评价OA北大核心CSTPCD

This study comprehensively evaluated the control effects of 4 fungicides including 43％pyrimethanil·fluxapyroxad SC,40％pyrimethanil SC,80％procymidone wettable powder WP,and 50％procymidone-thiram WP against bottle gourd gray mold by measuring their indoor toxicity to gray mold pathogen,field control efficacy,impact on soil microorganism(bacteria and fungi),and safety during gourd seedling growth stage.The results indicated that all 4 fungicides had certain inhibitory effects on gourd gray mold pathogen.Among them,43％pyrimethanil·fluxapyroxad SC had the best inhibitory effect.Seven days after first time spraying and 7 d after second time spraying the field control effects of spraying 5.78 μg·mL-1 of EC50 were all the best,being 63.94％and 78.46％,respectively.This fungicide had no significant affect on soil bacterial quantity,but could significantly reduced soil fungal quantity,which was safe for the growth period of gourd seedlings.High concentration fungicides had some inhibitory effects on bottle gourd seedlings.Beside 43％pyrimethanil·fluxapyroxad SC,all the other fungicides could lead to different degrees abnormal states in gourd seedlings.In conclusion,43％pyrimethanil·fluxapyroxad SC was suitable for use in production for controlling bottle gourd gray mold.