The AICRP-Weed Control was started under USDA programme for a period of six years from April, 1978. The Ist phase centres as given below remained for six years from April, 1978 to March, 1984. The IInd phase centres -were for five years from April, 1982 to March 1987, while the IIIrd phase centres remained for four years from April, 1986 to March, 1990 under USDA finance. After the termination of USDA assistance, the centres received full fledged financial support by the ICAR as All India Coordinated Research Programme on Weed Control.