Residues of Some Synthetic Pyrethroid Insecticides on Cabbage

Following the application of cypermethrin, fenvalerate, and deltamethrin to cabbage crop at rates of 50, 50 and 12 g a.i./ha, the maximum initial deposits of these insecticides on heads and leaves were 0.34 and 0.96, 0.25 and 1.34, and 0.08 and 0.30 mg/kg, respectively. These residue values were less than the maximum residue limit (MRU) values of 2 mg/kg for cypermethrin and fenvalerate on head of lettuce and 0.5 mg/kg for deltamethrin prescribed for leafy vegetables. Most of the insecticide residue on head were present on outer leaves. Thus normal use of these insecticides does not constitute any residue hazards to the consumers.