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RESULTS

(10)

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.

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.

DISEASE: Xanthomonas leaf blight

HOST: Onion

This was the first photo of onion leaf blight, which was considered a controversial finding for 10 years until an outbreak occurred in the West Indies.

DISEASE: Xanthomonas leaf blight

HOST: Onion

Diseased leaf with necrotic internal tissues.

DISEASE: Xanthomonas leaf blight

HOST: Onion

Onions with brown, necrotic, blighted leaves.

DISEASE: Xanthomonas leaf blight

HOST: Onion

Onions with severely blighted leaves.