Virginia Cooperative ExtensionCross, Gerald H.Chappell, William E.Kates, Allan H.Swader, Jeff2013-12-142013-12-141980http://hdl.handle.net/10919/24640viii, 28 leavesapplication/pdfen-USVirginia Cooperative Extension materials are available for public use, re-print, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.LD5655 .A762Aquatic pests -- ControlExtension publication7690453