Early stages of infection with verticillium wilt. Notice the leaf on the left side of the stem with characteristic V-shaped chlorosis. Most often leaves will initially be chlorotic and eventually take on a pinkish hue, followed by abscission.
Alfalfa stems with a range of severity. Mild infection on the left to severe on the right.
Alfalfa plant in the initial stages of infection (arrow indicates the infected plant). Notice chlorotic, wilted appearance of the plant as compared to the healthy surrounding plants.
Infected leaflets with developing "V" shaped yellow and brown tips.
Later stages of Verticillium infection. Plant loses color and vigor with the advance of the fungus within the vascular system. Leaflets become brittle and abscise from the plant.
