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RESULTS

(6)

DISEASE: Carrot yellows

HOST: Carrot

Flowers with shoot proliferation (witches’-broom) (left). Healthy flower (right). Virescence and phyllody of flower parts are common.

DISEASE: Carrot yellows

HOST: Carrot

Carrot with proliferation of roots. Initial symptoms include yellowing and narrowing of veins of young leaves. The entire leaf later becomes necrotic.

DISEASE: Maize bushy stunt

HOST: Corn (Maize)

Maize with chlorotic leaf margins and reddening of tips and margins of older leaves.

DISEASE: Maize bushy stunt

HOST: Corn (Maize)

Late stage of disease.

DISEASE: Maize bushy stunt

HOST: Corn (Maize)

Dalbulus maidis, leafhopper vector of 'Candidatus Phytoplasma asteris', the cause of maize bushy stunt.

DISEASE: Marginal leaf blight

HOST: Lettuce

Marginal leaf blight first appears as slimy wilting of leaf margins. Small, reddish lesions may be seen on leaf blades. Infected tissues turn brown to black in time.