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Abstract In order to evaluate the bactericidal effect of chemical fungicides for controlling pepper southern blight，this experiment carried out comprehensive evaluation on 7 fungicide prodrugs，14 fungicide preparations and compound combinations，and control effects of potted and field plants．The results of indoor bioactivity measurement showed that the antibacterial effects of single original drug of 97% prochloraz powder，98% fludioxonil powder and 96% pyraclostrobin powder on pepper southern blight were more obvious，with EC50 values of 0.000 6-24.488 4 mg · L-1. The mixed prodrugs of 97% hymexazol powder +96% pyraclostrobin powder had obvious synergistic effect. The EC50 values of 8 preparations，including 42% trifloxystrobin-tebuconazole suspension，25% pyraclostrobin suspension，15% triazolone wettable powder，etc. were lesser，which could significantly inhibit mycelial growth．6 kinds of mixed preparations including 25% pyraclostrobin suspension + 42% trifloxystrobin-tebuconazole suspension，etc. showed better inhibiting effect on pepper southern blight fungus and obvious synergistic effect. 3 preparations with better control effect of 42% trifloxystrobin-tebuconazole suspension，15% triazolone wettable powder and 25% pyraclostrobin suspension and 2 kinds of compound combinations with the best control effect of 25% pyraclostrobin suspension + 42% trifloxystrobin-tebuconazole suspension，43% tebuconazole suspension + 40% pentachloronitrobenzene were screened out through pot culture experiment. The control effect was 97.58%-100.00%. Field trials validated that 15% triazolone wettable powder and the combination of 25% pyraclostrobin suspension + 42% trifloxystrobin-tebuconazole suspension had obvious control effect．Their control efficacy was 85.81% and 82.02%，respectively．In this experiment，the optimal type of fungicide for controlling pepper southern blight were methoxyacrylates and triazole fungicide. Among them，15% triazolone wettable powder，the combination of 25% pyraclostrobin suspension + 42% trifloxystrobin-tebuconazole suspension could be used for comprehensive control of large areas pepper southern blight．
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Received: 27 March 2023
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