Buildup of insecticide residues in/on fruits and their safety evaluations.
Prasad V. G., Awasthi M. D.
Author Affiliation: Indian Inst. Hort. Res., Bangalore 560?080, India.
Proceedings of a national symposium on pesticide residues and environmental pollution, Muzaffarnagar, India, 2-4 October, 1985. : 59-63
Abstract : The persistence of insecticide residues on fruits was evaluated in Karnataka, India. Mango trees were treated with carbaryl (0.1 and 0.2%) at fruit setting and fenthion (0.05%) and quinalphos (0.05%) at stone formation, grapes were treated with dichlorvos (0.1 and 0.2%), monocrotophos (0.05 and 0.1%) and fenvalerate (0.01 and 0.02%) at berry development and lemons and limes were sprayed with monocrotophos and quinalphos at fruit development, both at 0.05 and 0.1%. Residues of carbaryl could not be detected on mangos harvested 55 days after foliar application. Fenthion and quinalphos persisted for over 10 days, but the residues were less than their respective tolerance limits within 7 and 10 days. On grapes residues of dichlorvos, monocrotophos, carbaryl and quinalphos persisted for 7, 7-10, 15-21 and 10-15 days, respectively. Waiting periods of 3-7 days for dichlorvos and carbaryl, 7-10 days for monocrotophos and 10-15 days for quinalphos were recommended. Lemon fruits accumulated larger initial deposits of monocrotophos and quinalphos than lime fruits probably because of the larger surface area of the lemons. Waiting periods of 3 weeks for monocrotophos and 3-4 weeks for quinalphos were necessary for lemons but these periods were 10 and 21 days, respectively, for limes.