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RESULTS

(8)

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: Goss's bacterial wilt and blight

HOST: Corn (Maize)

Wilted, dying plants. Leaves have gray to light yellow stripes and irregular margins that follow leaf veins. Systemically infected plants usually have orange vascular bundles.

DISEASE: Goss's bacterial wilt and blight

HOST: Corn (Maize)

The disease causes necrotic leaf lesions, which typically have dark flecks (freckles) within the lesions (not seen here).

DISEASE: Slime flux

HOST: Casuarina

Slime flux occurs on a number of tree species and is always associated with bacteria and yeast. However, the causal agent has not been identified.

DISEASE: Slime flux

HOST: Elm

Although bacteria are associated with slime fluxes of many trees, the causal agents have not been identified.

DISEASE: Slime flux

HOST: Maple

The causal agent of slime flux has not been identified.

DISEASE: Slime flux

HOST: Willow

Foam at site of infection. Slime fluxes are common but the causal agent has not been identified.