In this study, residues of carbaryl were estimated in greenhouse cucumbers, from the time of application till the harvest is done. Carbaryl was applied at recommended application rate (150 g in 100 1 water) and also at double the recommended application rate (300 g in 100 1 water). Analysis was carried out by the QuEChERS method using HPLC-UV. The average initial deposits of carbaryl on cucumber fruits were found to be 2.61 and 4.87 mg/kg at single and double dosages, respectively. Carbaryl was found rapidly dissipated off the cucumbers, following first order reaction kinetics at both the application rates. Residue levels of carbaryl in samples which were collected post application of the pesticide, throughout a period of 14 days showed a gradual and significant (with P<0.05) decrease in contents for carbaryl. These residues of carbaryl dissipated were found to be at the extent of 96.93 and 95.21%, respectively, at single and double dosages in 14 days. Half-life (T1/2) for degradation of carbaryl on cucumber was observed to be 3.14 and 3.51 at single and double dosages, respectively. A waiting period more than of 14 days was suggested for safe consumption of cucumber. Also, results showed that the dissipation was dependent on initial doses and followed first order rate kinetics
