Horticulture/Leaf Spots

Leaf Spots are circular lesions found on the leaves of plants, caused by either bacteria of fungi.

Symptoms and Signs
Initial infections are small, circular spots, usually with a differently colored zone on the outer edge. Severe cases cause distorted leaves or blight.

Life Cycle
Spores or bacteria overwinter on fallen leaves or buds. Growth is favored by moist conditions on the leaf surface.

Host Range
Most of the pathogens are quite selective.