DISTRIBUTION AND DEVELOPMENT OF WHITE POWDERY MILDEW ON FRUIT TREES IN THE CONDITIONS OF THE TURKESTAN REGION, BIOLOGICAL FEATURES OF THE PATHOGEN AND CHEMICAL PROTECTION MEASURES

The article studies the biological features of the pathogen powdery mildew of fruit trees in the conditions of the Turkestan region, the spread and development of the disease. Fungicides were used against the disease, and data on their biological effectiveness were given. A route inspection of apple orchards located in Temirlan, Kazygurt, and Keless districts of the main fruit zones of the Turkestan region was carried out. Verification works were carried out according to generally accepted methods in phytopathology and plant protection during the period of commercial fruit ripening. The examination 2 hectare Apple orchard at the farm "Abai" Keles district, the Prevalence machinists dew on the leaves of the tree made up 60.8% and level-38,0%. In apple fruits, the prevalence was 44.2%, and the dynamics of development was 25.6%. In the farm «Erimbetova» Kazygurt district on the survey results, 3 ha Apple orchard Prevalence of powdery mildew on the leaves amounted to 63.4%, and level-of 42.1%. The prevalence of powdery mildew in fruits was 58.8%, and the dynamics of development-26.2%. In the farms of the Temirlan, Kazygurt, and Keless districts of the Turkestan region, during the growing season, apple trees were sprayed against powdery mildew with 3 - fold fungicides Topaz 100, K.E., yield 0.4 l per hectare (standard), bayleton, 25% S.P. yield 0.2 kg per hectare; triafol, 25% S.P. yield 0.15 l per hectare: the first - when the flower node begins to turn red; the second - after flowering; the third-10-15 days after the second processing is used. The most effective fungicide against powdery mildew of apple trees was Triafol, 25% C. to 0.15 l/ha. The biological efficiency was 97.8%, and the standard, Topaz 100 K.e 65.3%. Hence, Trianol, 25% C. K fungicide, has shown very high effectiveness in the fight against the whiteness of apples.