Corky Root

Early symptoms of corky root are yellow bands on taproots and lateral roots of lettuce seedlings. These yellow areas gradually expand, taking on a greenish-brown color and developing cracks andrough areason the surface of the root. As the disease severity increases, the entire taproot may become brown, severely cracked, and nonfunctional; thefeeder root systemwill also be reduced and damaged. At this point, roots are very brittle and easily break off when examined. Corky root may cause internal