Weed control is by far the most pervasive and costly need in agriculture, both in underdevel oped as well as in technologically advanced production systems. In 1994, losses due to weeds in U.S. agriculture—including herbi cide costs and yield losses—amounted to over $ 15 billion, and about 96% of the more than 21 million acres of row crops grown in Iowa received at least one chemical herbicide appli cation. Pesticide use statistics reveal that more herbicides are used than any other class of pesticide. Despite the extensive use of herbi cides, certain weed species continue to cause problems in agriculture, and current control strategies for some of these are inadequate. Among these weeds are johnsongrass (Sor ghum halapense), the morning glorys (Ipomoea spp.), nutsedges (Cyperus esculentus), shattercane (Sorghum bicolor), and velvetleaf (Abutillon theophrasti).
A. H. Epstein
Micheal D. K. Owen, L. H. Tiffany
Year of Grant Completion
Epstein, Abraham H.; Owen, Micheal D.; and Tiffany, L. H., "Plant pathogens as biological agents for the control of weeds" (1995). Leopold Center Completed Grant Reports. 63.