Abstract Taking Corynespora cassiicola (Berk. & Curt.)Wei. as pathogen,allied toxicity measurement in laboratory and field control efficacy trial on famoxadone·mancozeb were conducted.The results showed that EC50 of famoxadone·mancozeb and mancozeb were 1.16 mg·L-1and 6.23 mg·L-1,respectively. The results of field trial indicated that after 3 successive applying of 68.75% famoxadone·mancozeb WG at 468.0,625.5,and 937.5 g·hm- 2 dosages,the control efficacies on Corynespora cassiicola could reach 78.61%,89.33% and 90.28%,respectively. Under these concentrations,no side effect was observed on cucumber.
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