1Ganzhou Vegetable and Flower Research Institute，Ganzhou 341413，Jiangxi，China；2Jiangxi Facility Vegetable Technology Innovation Center，Ganzhou 341413，Jiangxi，China；3Gannan Academy of Sciences，Ganzhou 341000，Jiangxi，China；4Ningdu County Agricultural Technology Extension Center，Ganzhou 342800，Jiangxi，China
Abstract：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．
