Rhizoctonia Diseases in Tobacco Greenhouses 
TB07 - Tobacco Disease Note No. 7

Target spot symptoms

Figure 7. Initial infection of target spot on larger seedlings start as a small foci (group of infected plants) where environmental conditions (high humidity and temperature) allow the formation of the hymenium.
Figure 8.  After hymenium has formed, the spores (basidiospores) are wind dispersed in the greenhouse and secondary infection starts.

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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.
Revised October 2001 by Plant Disease and Insect Clinic