Determination of the effectiveness of different spraying programs against powdery mildew (Erysiphe necator Schw.)

Abstract

The control of powdery mildew (Erysiphe necator Schw.) is carried out based on phenology in Turkey. First spraying is done when the shoots become 25-30 cm in length before blooming according to the Agricultural Control Technical Instructions. The aim of this project was to assay different spraying programs on epidemiology effects and determine the suitable time to start chemical control. Within the scope of the project, three different spraying programs were applied on Cabernet Sauvignon grape variety in the research area within the Tekirdağ Viticulture Research Institute in 2015. As a result of the applied programs; it is found that the effects of the disease control in fungicide applications in leaf for Program A (according to Agricultural Control Technical Instructions) as 36.4%, Program B (addition of an additional pesticide application between first two applications in Agricultural Control Technical Instructions) 43.2%, Program C (early chemical control when shoots are 10 cm) 59.3%; in cluster for Program A is 52.5%, for Program B 74.1% and for Program C 87.9%. It was suggested that Program B was a suitable alternative to control powdery mildew disease in Tekirdağ province and Thrace Region, since it was an economical option.