ARS | Publication request: Genetic and Physical Characterization of Binucleate Rhizoctonia Species Causing Web Blight on Azalea

Submitted to: Southern Nursery Association Research Conference
Publication Type: Proceedings
Publication Acceptance Date: August 15, 2005
Publication Date: December 1, 2005
Citation: Rinehart, T.A., Copes, W.E., Cubeta, M.A. 2005. Genetic and Physical Characterization of Binucleate Rhizoctonia Species Causing Web Blight on Azalea. Southern Nursery Association Research Conference. pp 260-264.

Interpretive Summary: We have found that the population of the fungus that causes Rhizoctonia web blight has a small genetic diversity. With this knowledge, we know that the Rhizoctonia population will follow a single disease development pattern. In addition, a genetic assay was developed to track the microscopic pathogen in the nursery that will be useful in future research, such as monitoring seasonal movement of the pathogen to devise new sanitation methods.

Technical Abstract: Web blight caused by species of Rhizoctonia is an annual problem on container-grown azalea (Rhododendron spp.) during nursery production in the southern U.S. While damage is not usually lethal, infected plants are not saleable during the current year and growth is reduced. The objective of this research was to characterize and identify the species of Rhizoctonia that cause web blight in azalea production to better prevent and control web blight infections.