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RESULTS

(40)

DISEASE: Aster yellows

HOST: Onion

Infected plants with yellowish, malformed leaves.

DISEASE: Aster yellows

HOST: Onion

Onion flower with unusual symptoms (left) compared with healthy inflorescence (right). Flowers are distorted and often have abnormally long pedicels. Young leaves may have yellow streaks or a general yellowing of basal portions.

DISEASE: Aster yellows

HOST: Potato

Chlorotic and stunted foliage with necrotic leaf margins. Other symptoms may be phyllody, virescence, purple or yellow pigmentation, and rolling of leaflets.

DISEASE: Aster yellows

HOST: Potato

Stunted, chlorotic plants (left) with stiff, rolled leaves.

DISEASE: Aster yellows

HOST: Potato

Diseased plant with malformed tubers.

DISEASE: Aster yellows

HOST: Ranunculus

Malformation of diseased flower.

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: Aster yellows

HOST: Strawberry

Aster yellows causes flowers to be entirely phylloid. Young leaves of infected plants are small, chlorotic, and cupped and have short petioles. Red coloration may develop on older leaves.

DISEASE: Aster yellows

HOST: Strawberry

'Marmolada' strawberry with fruit distortion and phyllody of achenes.