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RESULTS

(8)

DISEASE: Alfalfa dwarf

HOST: Alfalfa

Alfalfa dwarf is characterized by stunted plants (left), usually dark blue-green in color. Xylem tissues become brown, especially when exposed to air.

DISEASE: Bacterial leaf stripe

HOST: Millet

Leaf with long reddish stripes, usually vein delimited.

DISEASE: Bacterial leaf stripe

HOST: Millet

Leaf with reddish stripes delimited by veins.

DISEASE: Bacterial leaf stripe

HOST: Sorghum

Diseased leaf with linear, interveinal stripes that are purplish red. They also can be yellow, tan, or purple depending upon host reaction.

DISEASE: Bacterial leaf stripe

HOST: Sorghum

Leaf with reddish brown stripes between veins.

DISEASE: Bacterial leaf stripe

HOST: Sorghum

Highly susceptible cultivar with severe symptoms.

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.