Collar Rot in Tobacco Greenhouses
TB06 - Tobacco Disease Note 6

W. A. Gutierrez, H. D. Shew, and T. A. Melton

Factors that affect infection of collar rot

Figure 13. Debris left on seedlings after clipping could be the point of initial infection for collar rot.
Figure 14.  Debris is a natural nutrient source for Sclerotinia sclerotiorum ascospores. The debris provide enough nutrients for ascospores to germinate and initiate infection of seedlings.

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Published by North Carolina Cooperative Extension Service
Distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age, or disability. North Carolina State University at Raleigh, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.

Reformatted July 2001 by Plant Disease and Insect Clinic