|Can you suggest some specific varieties that are resistant to powdery mildew? The big victims in my garden were zinnias, hollyhocks, cosmos, sunflowers, morning glory, scarlet runner beans and peas.|
|Of all the plants you're having problems with, hollyhock is the only one with a reputation for developing disease. Maybe your plants are too crowded and are not getting the direct sunlight they require. Try planting your flowers so they receivefull sunlight for most of the day. Make sure each plant has enough elbow room to grow without touching other plants, and try to apply water to the ground early in the day rather than sprinkling the leaves of the plants. If you water early, the plants will have a chance to dry off before nightfall. Many annuals develop powdery mildew late in the season when the nighttime temperatures are low and the humidity is high. When this happens, pull the plants out and destroy them so the disease won't spread to otherplants.
Better luck next season!