[Dissipation of Fenitrothion (Sumithion) residues on cucumber in green houses]
1991
Al-Azawi, K.A. | Al-Adil, K.M. | Al-Samariee, A.I. (Baghdad Univ. (Iraq). Dept. of Plant Protection)
This research work was conducted in an experimental plastic house prepared and cultivated with cucumber. Cucumber plants were sprayed with fenitrothion at recommended rate of application. The residues in the leaves, fruits and soil were determined by gas chromatography. Also the importance of some food preparing methods such as washing, peeling and pickling of the fruits as a measure in decreasing the final residues were evaluated. The results showed that leaves residue dropped from 81.9 ppm to 0.02 ppm after 30 days and fruits residue dissipated from 0.32 ppm to 0.01 ppm after 10 days of the application. Based on the maximun residue limit, fruits can be consumed safely six days after the application of insecticide. The soil of the plastic house contained a residue of 5.87 ppm directly after the application, which then decreased to 0.24 ppm 10 days after the application. Results also indicated that fuit peeling was the most effective measure to reduce the final food residues less than the MRL. However, washing or pickling in reduce the residues but not to the accepted limits.
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