astronomical unit

Damask holds a Master of Arts in English and creative writing from the University of North Texas. Infection is more of a problem in the spring and fall, when temperatures are lower. Caused by a variety of fungal pathogens, the disease spreads sporadically on wind and may infect other desired plants such as flowers and vegetables. Try to avoid wetting the flowers when watering. Overhead watering will wash spores from your plants, according to the University of California Integrated Pest Management Online. The fuzzy mold that may develop is composed of millions of microscopic spores. Sooty mold is considered a cosmetic condition and does not usually harm petunias. The occurrence of mildew on your petunias is the result of a fungal infection called powdery mildew. Once gray mold has become established on plant debris and weak or dying leaves and flowers, it can invade healthy plant tissue. In warm-winter areas where freezing is rare, gray mold can be a year-round problem. Though overhead irrigation is typically discouraged due to its tendency toward promoting the development of fungal diseases, powdery mildew is an exception. While the cosmetic damage is unpleasant, a plant may lose "up to 25 percent of its leaves without problems," according to a Washington State University Extension publication. The spores germinate when environmental conditions are favorable, for example, when the relative humidity is 94% and higher or when the duration of leaf wetness is 12 hours or more at moderate temperatures (64°F to 77°F). Symptoms include the development of a white-hued powder-like growth on the surfaces of leaves and, less commonly, on flowers. Become familiar with the problem that lies behind the development of mildew on petunias and act quickly the moment symptoms appear. The fungus initially attacks foliage and flowers that are weak or dead, causing spotting and sometimes mold. Maintain extremely well-drained soil; waterlogged conditions cause decline. Remove and destroy affected plant parts. Remove infected flowers and leaves, and clean up plant debris. Black sooty mold is a condition that occurs on a variety of landscape plants, including petunias. about Ortho® MAX® Garden Disease Control Concentrate, Common Outdoor Bugs and How to Deal with Them, Controlling Pests on Flowers, Roses & Ornamental Plants, Ortho® MAX® Garden Disease Control Concentrate. Crowded plantings, rain, and overhead watering also enhance the spread of the disease. Powdery Mildew. Damage includes stunted, distorted growth, yellowed leaves and premature leaf drop. Mildew on Petunias Preventive Care. Powdery mildew fungi attack petunias with a display of easy-to-recognize symptoms. Choose control options such as horticultural oil, sulfur-based products or neem oil. Healthy petunias have a greater chance of avoiding and recovering from diseases than weakened petunias. Gray or brown spots appear on the flowers, especially in wet weather. 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