Evaluation of Fungicides for Preventive and Curative Effects against Powdery Mildew on Oriental Melon

摘要: Fungicides including keroxym-methyl (strobilurin fungicide), fenarimol and trifulmizole (DMI, boscalid (anilide) metrafenone (benzophenone) were evaluated for preventive curative efficacies against powdery mildew on oriental melon. The fungicides applied preventatively at 7 days, 3 days hours before inoculation. Curative applications made by applying three times the interval of one week when infected leaves about 16% or 30%. Then preventative after inoculation final application, respectively. Boscalid showed 74.3 68.3% development respectively, treated They 89.4 87.2% iniculation 98.5 93.2% However, there no in kresoxym-methyl, triflumizole femarimol (DMI fungicides) trebled both At treatment inoculation, they indicated 59.0, 42.5, 37.2% efficacies, When 30% mildew, application 85.9 74.0% tiflumizole fernarimol 5.5, 23.0 46.7% 16%, 100 97.5% relatively low 30.8 51.6%, Microscopic observation mycelial growth conidia formation detection disease lysis mycelium these suppression tendency accordance with fungicides.