Nowe możliwości zwalczania amerykańskiego mączniaka agrestu (Sphaerotheca mors-uvae)

Abstract

Summary American powdery mildew (Sphaerothec amors-uvae) is one of the most serious diseases of gooseberry and black currant. Only a few fungicides are registered to control this disease. Therefore, searching for new protection methods is of a special value. In 2010–2012, the effectiveness of the biological product AQ 10 WG containing 5 x 10 9 spores/g of fungus Ampelomyces quisqualis and Solfan PK fertilizer (49% potassium as K2O and 25% phosphorus as P2O5) were studied. In the case of gooseberry cultivar White Triumph both tested compounds limited the severity of disease on shoots and fruits by 70 to 93%. On black currant cultivar Ben Lomond the product AQ 10 WG reduced the infection of shoots in about 60%, and Solfan PK by more than 71%. The tested products revealed a good efficacy in the control of American powdery mildew. In the protection of black currants and gooseberry the effectiveness of these products was the same or lower than standard fungicides (Nimrod 250 EC, Score 250 EC, Signum 33 WG and Topsin M 500 SC).