Efficacy of some Insecticides against the Larvae of Khasi Pine Shoot Borer, <I>Dioryctria castanea</I> Bradley (Lepidoptera : Pyralidae)

Abstract

There was an epidemic of Khasi pine shoot borer,Dioryctria castanea in 1982 in Yachuli Khasi pine plantations in Arunachal Pradesh. All age groups were attacked. Two field trials were conducted at Yachuli to find out the efficacy of phosphamidon, dimethoate,monocrotophos, methyl-demeton, formothion and thiometon against the shoot borer. Spraying of 0.03% phosphamidon/0.03% dimethoate/0.04% monocrotophos/0.03% formothion/O.03% thiometon in the last week of February was highly effective in reducing the incidence of the shoot borer.