Susceptibility of different larval instars of red-headed hairy caterpillar, Amsacta albistriga (Walker) (Lepidoptera: Arctiidae) to nucleopolyhedrosis virus

Different instars of A. albistriga were susceptible to AaNPV, but early instars succumbed to mortality sooner compared to the later instars with an LT50 value ranging from 5.04 to 14.60 days. Therefore the importance of susceptible stage of A. albistriga to AaNPV for suppressing its population has been highlighted.