Suppression of population of tribolium castaneum by igrs in presence of a predator, xylocoris flavipes

Abstract

Insect growth regulators (IGRs), triflumuron at concentrations of 0.001, 0.05 and 0.1ppm, and diflubenzuron at concentrations of 0.005, 0.05 and 0.01ppm in presence of 2-, 4- and 8 pairs of a preda tor Xylocoris flavipes Reuter, significantly(p<0.001) reduced the population of Tribolium castaneum (Herbst) in 60 days exposure period. The PRC values ranged from 55.3 (0.005ppm of diflubenzuron with 2 pairs of X. flavipes) to 84.3 (0.1ppm of triflumuron with 8 pairs of X. flavipes). IGRs have re duced the predator’s population up to maximum as 56.6% compared to the control at 0.1ppm of tri flumuron when 2 pairs of predators were introduced during the same exposure tim