Copyright notice

This article is from the Encyclopedia of North Carolina edited by William S. Powell. Copyright © 2006 by the University of North Carolina Press. Used by permission of the publisher. For personal use and not for further distribution. Please submit permission requests for other use directly to the publisher.

Printer-friendly page

Blue Mold

by W. W. Yeargin, 2006

Blue mold, a fungal disease, decreases or destroys tobacco quality. Initially it was diagnosed in 1921 in tobacco plant beds in Georgia, and by 1931 it had found its way southward to Florida and northward to South Carolina, North Carolina, and Virginia. The mold enters the tobacco plant through the leaves or systemically through the soil. It is promoted by cool, damp, and rainy weather. By 1940 blue mold had become a serious and widespread plant bed problem in North Carolina, severely damaging the supply of regional tobacco plants and forcing farmers to transport plants from other states. This resulted in the spreading of blue mold, along with other diseases, throughout the flue-cured and burley tobacco areas of North Carolina.

By the late 1970s blue mold had spread from plant beds into tobacco fields, costing farmers in North Carolina and other states over $252 million in lost market value. Scientific research during the last years of the twentieth century, however, proved reasonably successful in controlling the disease and the damage it causes.


Furney A. Todd, Tobacco in the United States (rev. ed., 1979).

Additional Resources:

Blue Mold Factsheet, NCSU Department of Plant Pathology:

1947 research on controlling blue mold in Annual Report of North Carolina Agricultural Experiment Station (p. 40) from NCDCR Digital Collections



Add a comment

PLEASE NOTE: NCpedia provides the comments feature as a way for viewers to engage with the resources. Comments are not published until reviewed by NCpedia editors at the State Library of NC, and the editors reserve the right to not publish any comment submitted that is considered inappropriate for this resource. NCpedia will not publish personal contact information in comments, questions, or responses. If you would like a reply by email, note that some email servers, such as public school accounts, are blocked from accepting messages from outside email servers or domains. If you prefer not to leave an email address, check back at your NCpedia comment for a reply. Please allow one business day for replies from NCpedia. Complete guidelines are available at