More than 7000 host plants have been identified worldwide, and include a wide range
from ornamentals to fruit trees to field crops.
/programs/digital-diagnostics/plant-diseases/site-files/powdery-mildews/powderymildew.jpgObligate parasitic fungi that grow mainly on the surfaces of leaves and other aerial
plant parts. The superficial fungal growth often appears powdery. The fungi usually
penetrate and parasitize the epidermal cells and produce a layer that diverts water
and food materials to the fungal cells. Although severe mildew infections have little
impact on vigor, they may cause dwarfing, distortion, chlorosis, premature browning
of leaves, and supressed growth rate. Fungi may be active at a wide range of temperatures
and humidity levels.
Please contact your local county extension office for current information.