Evaluation of insecticides against aphids (Myzus persicae Sulzer) and caterpillars (spodoptera litura [f.]) on tobacco in Karnataka State (India)

0.02% a.i. dicrotophos and dimethoate, 0.025% a.i. demeton-S-methyl, thiometon, chlorfenvinphos and methomyl, and 0.03% a.i. phosphamidon were evaluated in the field for control of aphids (Myzus persicae Sulzer) infesting tobacco. All the insecticides were effective but chlorfenvinphos and methomyl were inferior to the rest. 0.03% and 0.06% a.i. endosulfan and trichlorfon, 0.05% and 0.1% a.i. carbaryl, and 0.025% and 0.05% a.i. methomyl were evaluated in the field for control of caterpillars ofSpodoptera litura (F.) defoliating tobacco. Nearly all the insecticides were effective and carbaryl and trichlorfon gave satisfactory control even at the lower concentrations tested.