DISSIPATION AND DETERMINATION OF Spiromesifen 240SCRESIDUES IN CUCUMBER AND EFFECT OF FOOD PROCESSING ONRESIDUE

Abstract

Laboratory and field studies were carried out at College of Agriculture-
University of Baghdad and State Board for Plant Protection– Ministry of
Agriculture to study the dissipation of insecticide, [Spiromesifen] 240SC which used
to control insects on Cucumber [plastic houses] by using High Performance Liquid
Chromatography [HPLC] technique, besides evaluate the efficacy of some
treatments on cucumber fruits [ washing in water and soap, peeling, immersion in
saline solution and pickling] to reduce the amount of insecticide residue in cucumber fruits. Results of Spiromesifen revealed that in first spray the residue in
leaves was 23.65 mg/kg directly after treatment then dropped to 0.09 mg/kg after 28
days. However the residue dissipated faster in second spray. In fruits, the residue in
first spray was 11.63 mg/kg directly after treatment reduced to MRL [Maximum
residue limit] in 7 days 0.19 mg/kg, however the dissipation was faster in second
spray, the residue reached MRL after 4 days 0.21 mg/kg. Regarding treatment of
washing the fruit, Oberon residue was dissipated in first and second spray after 3
days 0.21 mg/kg and 4 days 0.2 mg/kg respectively. Residue of Oberon reduced to
0.04 and 0.06 mg/kg after 21 days respectively. Also, treatment of peeling, saline
solution and pickling reduced Spiromesifen residue in first spray to MRL after 2
days [0.21, 0.23 and 0.22] mg/kg respectively, while in second spray, Spiromesifen
reduced dropped to MRL after 2 days [0.2, 0.17 and 0.18] mg/kg respectively for
previous treatment.