西芹黄萎病防治药剂筛选和毒力测定

针对西芹黄萎病病原菌开展室内防治药剂筛选和药剂毒力测定。按照药剂最大推荐剂量从14种供试药剂中初筛出8种有效药剂，以进口多菌灵、菌哥、新世生、瓜果类太宝、太医最佳，对菌丝生长的抑制率达100％。8种药剂对病原菌菌丝生长的EC50依次为进口多菌灵（0．0063mg／ml）〈太医（0．0073mg／ml）〈活根菌灭（0．0077mg／ml）〈枯萎灵（0．0079mg／ml）〈瓜果类太保（0．0092mg／ml）〈根腐宁（0．0103mg／ml）〈新世生（O．0192mg／ml）〈菌哥（O．0844mg／ml），进口多菌灵和活根菌灭对病原菌孢子萌发的EC50分别为1．50×10^-4mg／ml和1．55×10^-4mg／ml。

Screening and sensitivity of fungicides against Fusarium oxysporum f. sp. apii

The fungicides against Fusarium oxysporum f. sp. apii, the pathogen of celery wilt, were screened. The highest dose of each fungieide according to their introduction was used separately, and 8 of effective ones were screened from 14 fungicides. Some of these fungicides, such as 50% carbendazim wp, 40% thiram wp, 50% carbendazimMancozeb wp, 70% thiramthiophanate-methyl wp, 64% thiram carbendazim wp, were the best ones, their inhibition rate to the growth of pathogen mycelium were 100%. The EC50 of these 8 fungicides against pathogen myeelium growth were 50% earbendazim wp (0.0063 mg/ml)<64% thiramearbendazim wp (0.0073 mg/ml)<50% thiramcarbendazim wp (0.0077 mg/ml)<30% thiramcarbendazim wp (0.0079 mg/ml)< 70% thiramthiophanate-methyl wp (0.0092 mg/ml)<40% carbendazimquintozene wp (0.0103 mg/ml)<50% carbendazimManoozeb wp (0.0192 mg/ml)<40% thiram wp (0.0844 mg/ml). The EC50 of 50% carbendazim wp and 50% thiramcarbendazim wp against pathogen conidium bourgeon were 1.50×10-4 mg/ml or 1.55×10-4mg/ml respectively.