Forage grasses are subject to a multitude of leaf, stem, floral, and root diseases.
Maria Gorgo-Gourovitch, David Meigs Beyer, Ph.D., John A. Pecchia, Ph.D.
Exclusion prevents the entrance of pest organisms into new rooms and their escape from older ones. The latter should not be underestimated.
Powdery mildew is observed mostly as a foliage disease, but it occasionally causes a serious fruit rot. Severe foliar infection can damage leaves and reduce photosynthesis.
Robert Crassweller, Ph.D.
Powdery mildew is occasionally a serious problem on susceptible varieties of red and black raspberries. Infected plants may be stunted and less productive.
This disease is caused by Podosphaera clandestina, one of the common species of the powdery mildew group of fungi.
Powdery mildew, sometimes called "rose mildew" can attack leaves, twigs, and fruit.
Powdery mildew attacks buds, blossoms, leaves, new shoots, and fruit of apples and and reduces shoot growth and fruit set, and produces a netlike russet on the fruit of some varieties.