primeneniya fungitsidov dlya zashchity yarovoi pshenitsy ot kornevykh gnilei [Effi ciency of application of fungicides for spring wheat protection against root rots]. Sibirskii vestnik sel'skokhozyaistvennoi nauki [

Blumeria graminis and Pyrenophora tritici-repentis of wheat are deleterious infections that often require operation monitoring. The probability of mass lesion of crops by phytopathogens is determined primarily by the presence of pathogens' infectious origin, favorable conditions for their development and spread and host plants susceptibility. Protection strategy and tactics should be based on each particular field and conditions of the growing season. Effective protection of wheat from powdery mildew (75 -87%) was provided by fungicides based on 2-3 active substances, especially the drug Falcon (spiroxamine + tebuconazole + triadimenol). The biological fungicide Phytosporin-M (Bacillus subtilis) provided an average biological efficiency of 58% in years with moderate wheat lesion. Operational control of wheat leaves yellow speckle is more advisable to carry out with preparations on the basis of such active substances as “azoxystrobin + epoxyconazole”, “tebuconazole + propiconazole”.

Leaf-stem infections damage the wheat crop. Puccinia recondite and Blumeria graminis are especially harmful. There were outbreaks of septoriosis and pyrenophoresis (Stagonosopra nodorum, Pyrenophora tritici-repentis) and linear rust (Puccinia graminis). The lack of spring wheat crops and deterioration in the grain quality caused by epiphytoties is 25-50%. An effective method for controlling aerogenic infections is the use of fungicides. Studies on the effectiveness and feasibility of fungicidal protection of wheat against pathogens were carried out in Kurgan region. It is economically feasible to use Bacillus subtilis-based substances to prevent wheat infections. In case of a moderate wheat damage, it is recommended to use tank mixes (1/2 of systemic fungicide + hay-bacillus-based biofungicide). In case of mass development of leaf-stem infections, it is necessary to protect the crops using systemic fungicides if there is primary infection of a lower tier of leaves and weather conditions are favorable for pathogens. The use of fungicides preserved more than 30% of the wheat crops and improved the quality of grain. Profitability of chemical protection options increassed by 20-26 %.