Investigation on efficiency of new fungicides to control of the grapevine powdery mildew.
2009
Karimi Shahri, Mohammad Reza | Niyazi, Khalil
Powdery mildew of grapevine caused by Uncinula necator (Schw.) Burr.is an important diseases of grape in Iran and for its control annually spraying of fungicides is necessary. In order to introduce new effective fungicides in Shahroud during 1996 an experiment was conducted in a completely randomized block design. With 6 treatments as: topas , Trimidol, Triphimine , Dinocap, Sulphure Powder, Wetable sulphur. And control with three replications to indicate efficacy of new fungicides in controlling the disease. First spraying were done at 6-7 leaf stage and second after petal fall. 20 days after the last sprayings so leaves were collected randomly from each treatment and disease severity was stimated on the basis of 0-6 numbering method. Mean comparison was done on the basis of dauncon test. Results indicated that at 5% level of significance. There was difference between systemics (Topas, Trimidol and triphimine) with commom sulphur fungicides and diaocape while topas performance was the best. There was no statistically difference between sulphur fungicides, dincape with control. But in Khorassan province, to evaluate chemical control of the disease , Sulfur, Dinocap, wetable sulpur (80%W.P) ,Trimidal, Trifimin ,Topas ,Hexaconazole were tested in a completely randomized block design with totally eight treatments and four replications with times of application were sprayed four times .The results shows that in this comparison hexaconazole and trifimin fungicides with high effects were distignguished and grouped by with healthy check treatment.
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