Pests, Diseases, and Environmental Effects

Variously susceptible to aster yellows or aster wilt, powdery mildew, rust, rabbit damage

Aster Yellows

Botrytis Blight (below)

about 1/4 of flower is browned and dried, showing signs of disease

Downy Mildew (two images below)

a plant leaf has a white substances that follows along the main veins.
yellowing along the main veins of a leaf

Powdery Mildew (two images below)

a leaf uniformly botched with a white substance
a leaf uniformly botched with a white substance

Rhizopus Rot (two images below)

browned flower head with caverns.
flower head with white cotton-like substance on it

Rust (below)

dark brown spots are in a random pattern on a leaf surface

Verticillium Wilt (two images below)

Verticillium Wilt - stems

Verticillium Wilt -- leaves

Drought Stress (below)

A plant with living green tissue toward the top of the plant and dead tissue near the ground

Heat Stress (below)

a plant normally expected to stand upright is laying closer to the ground than normal

Leaf Curl (below)

curled leaves

Link to University of Nebraska Department of Plant Pathology and Cooperative Extension

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