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RESULTS

(11)

DISEASE: Aster yellows

HOST: Squash

Diagnostic characteristics for the disease are yellowing of young leaves, proliferation of secondary shoots, and rigid erect habit. Leaves are misshapen and smaller than normal and have stiff, thick laminae.

DISEASE: Bacterial blight

HOST: Soybean

Leaves with yellowish brown necrotic lesions. Lesions also may be yellow to light brown and bordered by yellowish green halos. Lesions occur on stems, petioles, and pods.

DISEASE: Bacterial leaf spot

HOST: Schefflera

Leaf with water-soaked lesions.

DISEASE: Bacterial leaf spot

HOST: Schefflera

Leaf with large, grayish necrotic areas.

DISEASE: Bacterial leaf spot

HOST: Schefflera

Leaf with many small, pinpoint-sized lesions and a few large lesions.

DISEASE: Bacterial leaf spot

HOST: Soybean

Early symptoms of bacterial blight.

DISEASE: Bacterial leaf spot

HOST: Soybean

Leaf with large, light brown necrotic lesions.

DISEASE: Bacterial pustule

HOST: Soybean

Early symptoms are minute, pale green spots on young leaves. Later, small pustules form in the center of spots, best observed on underside of leaves. Spots vary in size and darken with age and lesions coalesce. Dead areas are torn away by wind.

DISEASE: Bacterial wilt

HOST: Squash

Field with severe symptoms of wilt. Foliage often is chlorotic and leaf margins may be chlorotic and necrotic before plant death. Bacterial ooze may be seen streaming from the xylem when infected stems are cut.