date:Aug 20, 2012
to stay ahead of the curve and keep powdery mildew at bay, consider the following helpful hints: Avoid excess fertilizer. A good alternative is to use slow-release fertilizer.
Overhead sprinkling may actually reduce the spread of powdery mildew because it washes spores off the plant; also, if spores land in water, they die. The best time to irrigate is in mid-morning so that the plants dry rapidly, reducing the likelihood of infections by other fungi.
Space plants properly for adequate air circu