Document Type : Original Article
Authors
1
Central Agricultural Pesticides Laboratory, Agricultural Research Centre, Dokki, Giza, Egypt
2
Faculty of Agriculture, Kafr El-Sheikh, Tanta University, Egypt
Abstract
This investigation was carried out to study the fate of fenitrothion insecticide residues on moloukhia, green bean pods and cucumber vegetable crops. Fenitrothion is widely used in Egypt to control economic pests on vegetables. The plan of study included the followsing: persistence, half life and safe period for consumed moloukhia leaves, green beans pods and cucumber fruits. Also, the effect of washing, blanching, peeling, salting, and drying processes in removing the insecticide residues from the above mentioned vegetable crops. The results obtained indicated that fenitrothion residues after one hour from application were 107.1649, 18.0787, and 4.4088 ppm on moloukhia leaves, green bean pods and cucumber fruits, respectively. These amounts decreased to 22.3142, 9.5642 and 0.5749 ppm following one day from application, respectivley. After 155 days from treatment the residues became 0.0148, 0.0657 and 0.0057 ppm, respectivley. The half lives values were 10.6, 26.01 and 8.2 hours on moloukhia leaves, green beans pods and cucumber fruits, respectively, while the safe periods for consumption were 5.5, 13.6 2.9 days, respectively. Effect of different processes in removing fenitrothion residues from moloukhia leaves, green beans pods and cucumber fruits indicated that washing process with tap water removed 85.25% fenitrothion resi-dues on moloukhia leaves, 72.25% on cucumber fruits and 37.44% on green beans pods, respectively. Blanching process removed 80.07% from fenitrothion residues on and in moloukhia leaves and 58.54% on green bean pods. Peeling process of cucumber fruits removed 86.22% from fenitrothion, while after 7 days from salting process of cucumber fruits removed 56.97% and drying process of moloukhia leaves removed 74.13% from fenitrothion residues.
)
View on SCiNiTO