EFFECT OF SOME ANTIOXIDANTS AGAINST POWDERY MILDEW DISEASE OF GRAPES IN EGYPT

Grapes powdery mildew disease caused by Uncinula necator (Schw.) is one of the most critical diseases attacking grapes fruits, buds and leaves causing considerable yield losses. This study compared the effectiveness of three antioxidants on powdery mildew disease (ascorbic acid, citric acid and boric acid) in controlling the powdery mildew of grapes. The antioxidants were significantly better improving disease control and fruit yield production of grapes than the control. Ascorbic acid and citric acid were the most effective antioxidants on powdery mildew disease and increasing the yield.