Severity of powdery mildew was visually evaluated on individual leaves at weekly intervals and scored as percentage of leaf area infected for infected leaves. A negative correlation was found between infected leaf area per infected leaf and milk concentration sprayed on plants for the five experiments. High concentrations of milk were more effective than the conventional fungicides tested. This study demonstrated that milk is an effective alternative for the control of powdery mildew in organic agriculture. Pollacci, is a serious disease on cucurbits grown worldwide.
Powdery mildew occurs on leaves, stems and fruits.
For these reasons, alternative control measures are warranted. Several alternatives to conventional fungicides have been evaluated for cucurbit powdery mildew. Reuveni et al . These authors concluded that phosphates and potassium are appropriate foliar fertilizers, with a potential beneficial influence on disease control. Pasini et al .