Evaluation of Toxicity and Field Control Effect of Different Fungicides against Oat Anthracnose

YU Shicheng; XIU Zhijun; BAI Songlin; BAN Ruijuan; XU Linbo; WANG Fengwu; WANG Qianjun; LI Yunxia; ZHANG Xiaoyu

doi:10.15933/j.cnki.1004-3268.2023.12.011

Abstract：In order to control oat anthracnose,the toxicity of 12 fungicides to the pathogen of Colletotrichum cereale was determined by the methods of mycelium growth and spore germination,and control efficacy was tested by seed dressing and leaf spraying in fields.Combined with economic benefit analysis,effective fungicides would be selected to prevent and control oat anthracnose.The study found that carbendazim 50% WP had the strongest inhibitory effect on the mycelium growth of C.cereale with EC50 of 0.093 mg/L.The followed were tebuconazole 43% SC,difenoconazole 10% WG,prochloraz 45% EW and azoxystrobin 25% SC.Azoxystrobin 25% SC,carbendazim 50% WP,picoxystrobin-propi 19% ME and mancozeb 80% WP had a stronger inhibitory effect on spore germination of C.cereale.The EC50 values were 0.123,0.451,0.490 mg/L and 0.562 mg/L,respectively.The better fungicides by seed dressing were tebuconazole 43% SC,difenoconazole 10% WG,prochloraz 45% EW,with a preventive effect of 38.69%,36.90% and 35.23% respectively.The better fungicides by folial spraying were prochloraz 45% EW and tebuconazole 43% SC with the highest control effects of 76.79% and 65.66% respectively,the second was difenoconazole 10% WG.The effect of fungicides leaf spraying was higher than that of dressing seeds.The net benefits of spraying tebuconazole and prochloraz on the leaves were the best,with 1270.40-1530.03 yuan/ha and 1066.99-1413.71 yuan/ha,respectively.The results show that spraying tebuconazole and prochloraz on the leaves at booting stage has good effects and significant benefits for the control of oat anthracnose.