BIOCONTROL POTENTIAL OF TRICHODERMA ATROVIRIDE AND BACILLUS SUBTILIS AGAINST ERYSIPHE NECATOR UNDER FIELD CONDITIONS

Апстракт

Powdery mildew of grapevine, Erysiphe necator, is a very destructive grape disease, causing great economic production losses. That is why, regular fungicide applications are required. In recent years, due to the rise of the environmental awareness, alternative methods in controlling various plant diseases have slowly taken over the primacy from the classic chemical control. The aim of these experiments was to study the possibility for biological control of powdery mildew of grapevine with novel biofungicides Vintec (a.i. Trichoderma atroviride strain SC1) and Serenade Aso (a.i. Bacillus subtilis strain QST 713). Experiments were conducted during 2023 in the regions of Demir Kapija and Negotino, on two grape varieties, Riesling and Vranec. In the untreated variant in Negotino region, very high level of disease severity (44.8%) on bunches was observed, which demonstrated the destructive potential of this disease in our country. In Demir Kapija region, significantly lower level of disease severity was observed in the untreated variant (7.6%). In conditions of very high levels of disease severity, both of the tested biofungicides showed comparable and good fungicide effectiveness, above 90% (Serenade Aso – 94.64 % and Vintec – 97.03 %). In the region of Demir Kapija, where the level of disease severity was lower, both biofungicides reached absolute efficacy performance of 100%.