NOTE: U.S. SHIPPING ONLY. Weeds threaten the safe, efficient, and sustainable production of food, feed, fiber, and biofuel throughout the world. Featuring more than fifteen hundred full-color photographs, this handy guide provides essential information on four hundred of the most troublesome weedy and invasive plants found in the southern United States. Charles T. Bryson is a research botanist for the United States Department of Agriculture-Agricultural Research Service (USDA-ARS) at the Southern Weed Science Research Unit in Stoneville, Mississippi. Michael S. DeFelice is a senior manager at Pioneer Hi-Bred International, Inc.