Dichlorvos and dimethoate residues in betelvine (Piper betle) foliage

Abstract

Separate field trials were conducted to study the magnitude of dicblorvos and dimethoate residues in betel leaves
(Piper betel C). Betel leaves were sprayed thrice at fortnightly intervals with the insecticides at a concentration of 0.0S
and 0.10%. The amount of initial residues of dichlorvos aod dimethoate was 12.54-12.59 and 11.69-11.89 ppm
respectively at 0.05% dose, aod 24.82-24.88 and 21.06-21.88 ppm at 0:10%, For both the insecticides residues fell
well below the tolerance limit during the first 14 days, after which the betel leaves cao be harvested.