The fate of synthetic pyrethroid (permethrin) on the surface and internal parts of the stored wheat grains [Egypt].
1988
Abdel Samed A.A. | Khalil F.A. | Soliman N.Z. | Samaan M.A.
Gas liquid chromatographic analysis indicated that the synthetic "permethrin" degraded 61 stored on the surface of Giza157 aqnd sakha 61 stored wheat. Permethrin disappearance behaviour followed two phases, slower degration which occurred shortly after treatment and rapid degradation which occurred within longer periods. It was found out that, the amounts of external residues decreased slowly at the first intervals and then gradually to approach their minimum amounts after six months. The average half life of permethrin on wheat surface averaged between 60-75 days and was affected by both varieties of wheat and the insecticide application rate. Permethrin is recommended to be used in protecting wheat grains against infestation and reinfestation along 90 days, after application. GC/MS analysis pointed out that the 2 major degradation products of permethrin 2,2-dimethy-3 (2,2 dichlorovinyl) cyclopropane carboxylic acid and 3-phenoxy benzyl alcohol. Thin layer chromatograms showed that both cis, trans-3 (2,2-dichlorovinyl)-2,2-depimethylcyclopropane carboxylic acid, Rf 0.58 were detected on the surface of all samples analysed after two months of insecticide application. Storage for more than four months helled permethrin to penetrate through the inner parts of the grains.
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