A BSTRA CTThe pyrethroid insecticide bifenthrin was used for control of the squash bug Anasa tristis Deg. on pumpkins. An analytical method has been developed for analysis of bifenthrin residues in pumpkins. The maximum bifenthrin residue found was 0.007 mg kg -'. The bifenthrin residue was also examined by combined gas chromatographylmass spectrometry in the electron impact mode with selected ion-monitoring for detection, 141 Pestic. Sci. 0031-613X/91/$03.50 0 1991 SCI. Printed in Great Britain