Fungicides effect on powdery mildew and wheat yield is studied in an experience placed at S.C.D.A. Lovrin. The purpose of this study is to register if the yield differences among treated variant and tester (no treated) are significant. In this experience are investigated and treated 25 winter wheat varieties with different reaction in case of Blumeria graminis f. spec. tritici attack (R – resistant, MR – medium resistant, S – sensitive). Because in experience are used some fungicides those 25 winter wheat varieties are divided in four groups: three groups with six varieties and a group with seven varieties. There is tested the fungicides efficiency on the background of natural infection. All the data are statistically analysed. The treatment with fungicides (fenpropimorph and epoxyconazole, triflumizol and clorotalonil, ciproconazol and propiconazol, azoxystrobin) from this experience is executed at 49-50 growth stage (after Zadocks scale – ear emergence). The disease where present in experimental field during treatment applying. Fungicides efficiency is appreciated as: very good for fenpropimorph and epoxyconayole in case of Arieşan sensitive variety and very good for medium resistant varieties from first varieties group; very good for triflumizol and clorotalonil (Boema sensitive variety) and totally efficient for the other varieties from second group; very good and totally effective for ciproconazol and propiconazol (Izvor, Turda 2000, and Ciprian sensitive varieties); satisfying and good action for azostrobin case of Partizanka and Bezostaia sensitive varieties. The yields obtained in the case of treatment experience are superior in comparison with non-treated variant; these proving that the fungicides from mixtures are biologically compatible and are influencing positively plants biochemistry in a positive way.

fungicides; Blumeria graminis; varieties; powdery mildew; yield; virulence

Presentation: oral