Persistence and Dissipation of Hexaconazole Residues in/on French Beans

Persistence and dissipation of hexaconazole on French bean pods were studied following foliar spray application of contaf 5C at the rate of 525 and 1050-g a.i. ha⁻¹ at pod formation stage. An initial build-up of 0.197 and 0.485 mg kg⁻¹ of hexaconazole was resulted from the effective and higher rates of application. The dissipation of residues showed half-llives of 2.59 and 4.21d and required pre-harvest waiting periods of 6.5 and 13.0d for safe consumption of bean pods.