RESIDUE RISK ASSESSMENT OF SOME ORGANO-PHOSPHORUS INSECTICIDES IN CAPSICUM
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Date
2013
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ABSTRACT
The present investigation entitled ���������Residue risk assessment of some organo-phosphorus insecticides in capsicum��������� was carried out in the Department of Entomology, Dr. Y S Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during the year 2013. The objectives of the study were to evaluate the persistence of acephate, profenofos, quinalphos and triazophos in capsicum fruits, accumulation of these insecticides in soil and to study the effect of culinary processes on insecticide residues. The persistence study on capsicum fruits recorded initial deposits due to single dose each of acephate, profenofos, quinalphos and triazophos as 0.540, 1.403, 0.656 and 1.870 mgkg-1, respectively. However, at double dose the deposits were 1.036, 2.720, 1.873 and 3.076 mgkg-1 for respective insecticides. The initial deposits of 0.253, 0.913, 0.356 and 0.816 mgkg-1 at single dose and 0.483, 1.796, 0.800 and 1.600 mgkg-1 at double dose were observed for arespectively, in capsicum cropped soil. The residues of acephate, quinalphos and triazophos reduced to half in less than 2 days, whereas in profenofos it took 2-2.6 days. The waiting periods for the respective insecticides were worked out at their limit of determination (0.05 mgkg-1) due to lack of MRL value in India. The tap water washing, saline water washing and lukewarm water washing of capsicum fruits were effective in removing residues upto 45.9, 54.09 and 61.29 percent, respectively. However, cooking (open pan and microwave) was found most effective (upto 73.77%) in dislodging insecticide residues. The study concluded that profenofos was the most persistent and triazophos as least among test insecticides applied on capsicum fruits. The safe waiting period on capsicum was suggested as 6.8, 9.6, 7.2 and 3.6 for acephate, profenofos, quinalphos and triazophos, respectively at 0.05 mgkg-1. Cooking (open pan and microwave) was found as the most effective decontamination process.