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_ I _ acreage adequate Africa agrichemical agricultural research Applied weed areas atrazine become Brazil Central America cereals conducted control weeds Costa Rica cotton course in weed crop loss crop yields developing countries economic loss Ecuador engaged in weed equipment experiments extension farm farmers hand labor hand weeding herbicide testing programs herbicides Imperata cylindrica included increased INIAP IPPC IPPC program lack limited major weed problems methods of weed Ministry of Agriculture Nigeria Oregon State University paraquat personnel pesticides plantation crops private sector public agencies recommendations Research Institute rice Rottboellia Rottboellia exaltata L.f. Sorghum SPECIFIC WEED Striga spp sugarcane technicians trained in weed trained weed scientists treated with herbicides Tunisia USAID weed competition weed control methods weed control problems weed control programs weed control research weed flora weed problems weed research weed science programs weed science research weed species wheat yield losses