Field evaluation of insecticides on the control of rice bug (Leptocorisaacuta thunb.) in epidemic outbreaks

Abstract

Two field experiments were conducted to assess the efficacy of different insecticides for controlling Leplocorisa acula Thunb. at different population levels. In the first experiment, where there was more of a population stress, the insecticides malathion, methyl parathion and fenthion were found to he more effective in controlling the hug, the percentage reduction heing 75.72 to 97.15, 72.71 to 94.76 and 69.92 to 91.85 per cent respectively. In the second experiment with lesser population stress also, the same insecticides showed the maximum effect in control! ing Leplocorisa acula in the field. The effect of these insecticides was indicated by the higher grain/chaff ratio in all these treatments.