The information in this manual applies to control of aquatic pests in recreational waters, agricultural reservoirs, ornamental ponds, coastal bays, estuaries and channels, and drinking water reservoirs. Mechanical, cultural, biological, and chemical control methods are discussed. The majority of the material is devoted to weed control in static water, large impoundments, flowing water, and limited-flow waterways. Control of vertebrates is mentioned briefly. Environmental considerations and units and conversion equivalents are also covered. (BB)