Powdery mildew consist of variety of fungal species which infect and cause diseases in various species of plants.
These diseases get their name from the powdery spores that appear on infected leaf surfaces.
Symptoms usually begin on the older, lower leaves. As their capacity to conduct photosynthesis is hurt, plants may lose their color. Leaves may wither and die as the disease progresses. Powdery mildew symptoms and outbreak conditions vary from species to species.
Powdery Mildew In Solanaceous Crops
Different species of powdery mildew-causing fungi will produce different symptoms on solanaceous crops.
Some species will cause yellow or bright green spots to appear on the upper sides of leaves. Other species will create a whitish-greyish powdery coating. Powdery coating may sometimes be found on the undersides of leaves as well.
Powdery Mildew In Cucurbits
White powdery spots will appear first on the undersides of leaves , and then the upper sides of leaves, stems, and petioles.
Late in the growing season, small dark brown spherical structures may develop on the leaves – these protect the fungal spores during the winter and may become sources of infection in following seasons.
Powdery Mildew In Cannabis
White powdery spots will appear on leaf surfaces, petioles, and flowers.
In time, small spherical structures may appear, changing colors from yellow to black as they age. These structures carry overwintering spores.
