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RESULTS

(8)

DISEASE: Bacterial blight (Angular leaf spot)

HOST: Cotton

Leaf with advanced stage of blight.

DISEASE: Bacterial blight (Angular leaf spot)

HOST: Cotton

Highly susceptible (left) and resistant (right) cotton cultivars. The black arm stage of the disease is the most serious and occurs when bacteria invade petioles and then stems.

DISEASE: Bacterial blight (Angular leaf spot)

HOST: Cotton

Characteristic early symptoms are water-soaked leaf spots and water-soaking along veins.

DISEASE: Bacterial blight (Angular leaf spot)

HOST: Cotton

Leaf with dark, angular leaf spots. Systemic invasion causes blackening of midribs.

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion

Dark, rotted areas of stalk and leaves caused by systemic invasion of the pathogen.

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion

Gray-brown rot of onion after inoculation. Disease starts as small, water-soaked lesions that later develop into slimy, gray-brown rot. The disease progresses downward from the stalk and may rot the entire bulb.

DISEASE: Bacterial flower stalk and leaf necrosis

HOST: Onion

Leaves with necrosis and rot. The common name for this disease is the same as those used for two other diseases. Also, another common name for this disease is bacterial soft rot.

DISEASE: Bacterial pustule

HOST: Soybean

Early symptoms are minute, pale green spots on young leaves. Later, small pustules form in the center of spots, best observed on underside of leaves. Spots vary in size and darken with age and lesions coalesce. Dead areas are torn away by wind.