Bacterial Blight (Pseudomonas syringae, Xanthomonas campestris)

Bacterial Blight

Bacterial Blight: biology

Usually seed-borne, but may be stubble-borne. The bacteria ooze on to the surface of infected tissues druing wet weather and spread to healthy plants by rain splash.

Bacterial Blight: damage description

Small oily spots on leaves enlarge and turn brown and may cause the whole leaf to die. Infected parts of leaves are relatively translucent. Symptoms on the leaf-like bracts of pea plants are often concentrated near the point of attachment to the stem. On pods, oily spots turn brown and may be slightly sunken. Seed may be discolored.

Common, but seldom damaging, except in irrigated crops or very wet seasons, or in fields where hail damage has promoted infection by the bacterium.

Bacterial Blight: management

Use disease-free seed produced in arid areas. Where the disease is a problem, plant resistant varieties and use diverse rotations. Field scouting is unnecessary, as no control measures are available.