You will be instructed to apply it in early morning or evening, i.e. Be sure to read the entire label before application. Earth brand fertilizers help plant roots access water and nutrients in the soil creating a healthier, more disease resistant plant.Īs a preventative use a Neem Oil-based fungicide. Also be sure to remove plant debris on the ground under your plants. Remove severely infected leaves, especially on vegetable crops and roses. Also give your plants as much sun as they will tolerate again, damp shade can promote development of mildew spores. Many fungal diseases are promoted by damp, still air. Provide good air movement for your plants. Water in the morning instead of evening so that splashed water does remain on the plant overnight. Keep water off the foliage and avoid overhead waterings. During summer, vigorously growing squash and tomatoes may require daily waterings, especially when grown in containers or shallow raised beds. A plant lacking water or that has wilted between waterings is far more likely to become infected with powdery mildew.įirst off, be sure your plants are well watered. Once vigorous growth begins and the plants require more water, the first one without the water-filled saucer will be far more likely to get powdery mildew. Plant a cucumber or squash in one pot and plant another in a second pot, but place a saucer filled with water under the second pot. macrophyllum) do not show signs of powdery mildew until after the rains stops and summer begins.Ī simple demonstration further illustrates this point. The native Vine Maple (Acer circinatum) and Big Leaf Maple (A. One evidence of this is that powdery mildew is more prevalent during the drier summer months than in winter. Spores of all types of powdery mildew will germinate and grow in the absence of water. While water on foliage can spread spores of powdery mildew, a plant that is lacking water is more likely to contract the disease. Most often we hear that a plant “gets” powdery mildew from overhead watering or water on the foliage. One of the common misconceptions about powdery mildew relates to the difference between why a plant contracts the disease versus what spreads the disease. Many vegetable gardeners are very familiar with powdery mildew on crops like cucumbers, squash, and tomatoes. Many plants rarely, if ever, get powdery mildew, while other plants are notoriously susceptible to it, such as shrubs like Lilacs, Roses, Spiraea, Nandina annuals and perennials like Zinnias, Cosmos, Delphinium, Columbine, Dahlias, and Verbena. Oldest leaves are the first to show damage, and while it often does not kill the plant, it will affect plant growth and decrease the yield of certain vegetable crops. Powdery mildew commonly looks as if baby powder has been sprinkled or smeared on leaves and sometimes stems.
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