新疆花生镰刀菌根腐病药剂防治筛选OA

This study addresses the control of peanut Fusarium root rot in Xinjiang by systematically evaluat-ing the inhibitory effects of nine fungicides on two primary pathogenic fungi,Fusarium proliferatum and F.equiseti,through in vitro screening and pot-based efficacy trials.The in vitro toxicity assays demonstrated that chemical fun-gicides exhibited significant overall inhibitory effects.Notably,43％tebuconazole showed EC50 values below 1 mg/L for both Fusarium species,with an exceptionally high toxicity against F.proliferatum(EC50=0.001 mg/L).Similarly,45％pyraclostrobin·tebuconazole displayed excellent inhibitory activity,with EC50 values generally below 5 mg/L for both pathogens.In contrast,the biological agents,300 million CFU/g Trichoderma harzianum and 100 billion CFU/g Bacillus subtilis,showed weaker inhibitory effects.The results of the pot experiments further validated the in vitro findings.At a concentration of 10 mg/L,43％tebuconazole achieved a control efficacy of 71.50％against F.proliferatum,while 70％thiophanate-methyl reached 66.66％efficacy against F.equiseti.Both fungicides demon-strated significant dose-dependent and cumulative effects,with control efficacy showing a positive correlation with fungicide concentration.Continuous application further enhanced the control efficacy by 20％-30％.In summary,the chemical fungicides 43％tebuconazole and 45％pyraclostrobin·tebuconazole are recommended as important references for the field management of peanut root rot,providing a theoretical basis for its scientific control.