Abstract: 21 kinds of low-toxicity disinfectant commonly used in production were selected, aiming at three major diseases of cucumber, such as cucumber downy mildew, cucumber angular leaf pot, cucumber corynespora target leaf spot. The experiment of chemical control was carried out. The results showed that 100 g/L cyazofamid SC, 500 g/L fluazinam SC, 72% cymoxanil-mancozeb（Curzate） WP and 75% chlorothalonil WP, 687.5 g/L fluopicolide-propamocarb（Yin Fali）SC, 722 g/L propamocarb hydrochloride（Pulike）AS could be used to control cucumber downy mildew. 20% zinc-thiazole SC,33.5% quinoline copper SC, 3% zhongshengmycin AS could be used to control cucumber angular leaf pot. 75% trifloxystrobin-tebuconazole WDG, 40% difenoconazole-prochloraz EW, 12.5% myclobutanil EC could be used to control cucumber corynespora target leaf spot.

Key words: cucumber, diseases, high efficiency, disinfectant, screening, Wuhan city