Residue and dissipation of two formulations of emamectin benzoate in tender cowpea and old cowpea and a risk assessment of dietary intake

•Dissipation and terminal residues of emamectin benzoate EC and ME in cowpea were studied.•The dietary intake risk of emamectin benzoate in tender cowpea and old cowpea was evaluated.•Half-lives of emamectin benzoate EC and ME in tender cowpea and old cowpea are less than 3 d.•Terminal residues in tender cowpea and old cowpea are lower than the MRLs issued by China after 7 d.