Screening of fungicides to control powdery mildew on honeysuckle
[Aims]The aims of this study is to screen out effective fungicides for controlling Erysiphe lonicerae,and guide their scientific use in the field.[Methods]The pot test method was used for the bioassay of 5 fungicides including flusilazole,difenoconazole,pyraclostrobin and other two fungicides.The spray method was used to determine their safety and field efficacy.[Results]Flusilazole had the highest activity against E.lonicerae,with an EC50 value of 0.9043 mg/L,followed by difenoconazole and pyraclostrobin,with EC50 values of 1.1320 and 1.5761 mg/L,respectively.Flusilazole,difenoconazole and pyraclostrobin had no negative influence on the growth of leaves and branches and weight of honeysuckle,indicating that they were safe and harmless to honeysuckle.Field efficacy trials indicated that flusilazole 400 g/L EC at 80.0 mg/kg,pyraclostrobin 25％SC at 250 mg/kg and difenoconazole 10％WG at 166.6 mg/kg were all effective in controlling honeysuckle powdery mildew,with control efficacy of 83.60％,81.54％and 79.82％after the second application.[Conclusions]Flusilazole 400 g/L EC,difenoconazole 10％WG and pyraclostrobin 25％SC are effective to control the powdery mildew on honeysuckle.It should be used before or at the onset of the disease,and used again with an interval of 7-10 d.Throughout the entire growing season,it can be applyed no more than two times.To avoid the development of resistance,it is recommended to use it alternately with other types of fungicides.
万方数据
维普
