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RESULTS

(9)

DISEASE: Elm yellows

HOST: Elm

Symptoms of elm yellows occasionally appear on one branch before others, but more often they involve the entire crown.

DISEASE: Elm yellows

HOST: Elm

Diseased twig (right) with epinasty, chlorosis, and yellowing of leaves. Sometimes both yellow and green leaves occur on same branch. Healthy branch (left).

DISEASE: Elm yellows

HOST: Elm

Branches with butterscotch discoloration (center) and necrotic flecks in phloem and vascular cambium (right). Healthy branch (left). Sudden wilt and browning is common with small trees.

DISEASE: Elm yellows

HOST: Elm

Elm yellows is characterized by witches'-brooms and stunting. Some cultivars have both yellow and reddish foliar discoloration.

DISEASE: Elm yellows

HOST: Elm

Late stage of elm yellows disease.

DISEASE: Greening disease

HOST: Periwinkle

Healthy flower and infected flower.

DISEASE: Greening disease

HOST: Periwinkle

Diseased plants with phyllody and greenish yellow leaves.

DISEASE: Greening disease

HOST: Periwinkle

The disease causes virescence and phyllody, distorted and discolored leaves, and greening of flowers.

DISEASE: Syringae leaf spot

HOST: Tomato

Leaves with brown necrotic lesions and chlorotic margins. Symptoms vary greatly among cultivars. Some have black or brown lesions with bright yellow, chlorotic areas and others do not have yellowing.