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

Rhizoctonia solani structures 

Figure 22. Thanatephorus cucumeris, name of the sexual stage of Rhizoctonia solani, is present when high temperatures and moisture are present in tobacco greenhouses.  Spores (basidiospores) are produced on a specialized fungal structure called a hymenium.
Figure 23. The hymenium is formed on the surface of any tissue (infected or not). Basidiospores are produced on the hymenium and wind dispersed in the greenhouse. Most of the AG3 strains form hymenia very easily in the greenhouse.

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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 Sept. 2001