Evaluation of some fungicides against powdery mildew of barley

The causal agent of barley powdery mildew is Blumeria graminis fsp hordei . It can attack all parts of barley crops during the growing period. If it does not be controlled it can cause serious lost. This disease is more important on barley than on wheat. It is common in different regions of Iran and limits crop production. There is many effective way for controlling of this disease. In sever infection, use of fungicide is necessary. For this purpose an experiment was conducted in randomized complete block design with four replications and 7 treatments in each two provinces Tehran(karaj) and Semnan(Shahrood) during 2011-2013. In this study the effects of propiconazole EC 250(tilt) 1 l/ha, tebuconazole EW 250 (Folicur) 1 l/ha, flutriafol SC 12.5 % w/v (Impact) 1 l/ha, cyproconazole SL10 (Alto) 0.5 l/ha, flutriafol+Carbendazin SC200gr/l (ImpactR) 1.5 l/ha evaluated for controlling of barley powdery mildew. Suseptable barley cultivar (Karoon dar Kavir) was used in these experiments. Each treatment was planted in eight lines with 4 meter long, in karaj and shahrood. Infected plants residue which was collected from infected field of barley to powdery mildew in each area, is crashed and spread through the rows of treatments as spreader except contro-. After observation the acurance of the disease, spraying of the fungicides have been done. According the method of Saari_ Prescott the scoring was done. The results showed that, there were significant difference between fungicides treatments and controls, but no difrence between fungicides treatments with each other. The effect of treatments on weight of the products were investigated. According the result there was not significant difference between fungicides treatments and controls.