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RESULTS

(9)

DISEASE: Olive knot

HOST: Olive

Multiple infections of young stems. The bacterium invades vascular tissues during certain times of the year and may be isolated from branches that appear healthy.

DISEASE: Olive knot

HOST: Olive

Tree with knots/galls on branches along with twig dieback, which is associated with knots. Fusarium and Diplodia spp. infect through knots and are thought to be main reason for dieback.

DISEASE: Olive knot

HOST: Olive

Multiple infections on olive branch. Knots at this stage begin to die from the outside in and are infected by several fungi.

DISEASE: Stewart's wilt

HOST: Corn (Maize)

Wilted seedlings resulting from systemic invasion.

DISEASE: Stewart's wilt

HOST: Corn (Maize)

Leaf blight is the dominant symptom of this disease. Lesions begin as gray-green to yellow in color and turn brown in time.

DISEASE: Stewart's wilt

HOST: Corn (Maize)

Flea beetle and scars caused by feeding damage. The beetle is a vector and is an overwintering site for the bacterium.

DISEASE: Stewart's wilt

HOST: Corn (Maize)

Young wilted plant with pale green and yellow streaks on leaves.

DISEASE: Varnish spot

HOST: Lettuce

Leaf with large brown and small, shiny, dark brown necrotic spots that spread in size and later dry out.

DISEASE: Varnish spot

HOST: Lettuce

Advanced stage of disease with large, brown necrotic areas. They most often are along veins. Outermost leaves of the head usually are not affected.