Dr. Charles T. Bryson  Research Botanist  Southern Weed Science Research Unit  141 Experiment Station Road  PO Box 350  Stoneville, MS  38776  Office:  662.686.5259  FAX:    662.686.5422  Email: Charles.Bryson@ars.usda.gov

A major component of Dr. Bryson's research is to discover the ecological range of invasive weeds (especially recently-introduced non-native species) and to determine the long-term effects of invasive weeds on crop growth and yield in various tillage production systems. nbsp;Other research involves studying shifts in populations, biology, ecology, and reproductive ability of non-indigenous and native weeds in agronomic, urban, and natural areas.

He has developed best management strategies for troublesome weeds such as bermudagrass, purple nutsedge, hemp sesbania, tropical soda apple, and texas gourd and for large-scale crop production of a potential crop, annual wormwood, that produces a natural compound with antimalarial properties.  Dr. Bryson has also characterized the competitive effects of hemp sesbania in cotton.  He developed a technique and determined the rain-free period required for several postemergence herbicides currently used in crop production.  This information allows farmers to maximize herbicide efficacy by using weather predictions and to minimize off-target movement of herbicides.

Dr. Bryson is an authority on the identification, ecology, and biology of the family Cyperaceae and the prickly nightshades (Solanaceae) in the southern United States.  He is the curator of the Southern Weed Science Research Unit's herbarium, which serves as a repository for vouchers for research projects and floristic studies.