Verticillium Wilt

Marijuana Horticulture

by Jorge Cervantes

Identify

Lower leaves develop chlorotic yellowing on margins and between veins before turning dingy brown. Plants wilt during the day and recoup when the light goes off. Wilt soon overcomes parts of the plant or the entire plant. Cut the stem in two and look for the telltale brownish xylem tissue. The fungus blocks the flow of plant fluids, causing wilting.

Control

Use fresh, sterile soil. God drainage. Use ammonical nitrogen as a source of nitrogen. Do not overfertilize.

Biological

Bio-Fungus, Rhizo-Plus.

Sprays

No chemical spray is effective.