MepPlus is a premix of Mepiquat Chloride and Bacillus cereus (BP01). It gained full EPA registration in 1997 for use on cotton. The B. cereus component has a tolerance exemption on all crops. MepPlus was extensively tested by university researchers across the US cotton belt in 1996 and 1997. It provides both significantly higher lint yield and more consistent yield increases than Mepiquat Chloride alone while producing the same degree of earliness and growth control. It was introduced in the US commercially late in the 1997 season. Yield results and preliminary information on the possible mode of action are provided.