EFFECT OF IGRS ON PUPAL AND ADULT SUPPRESSION OF Tribolium Castaneum (Herbst, 1797) AND Trogoderma Granarium (Everts, 1898).

The herein reported studies were conducted to investigate the insecticidal effect of seven insect growth regulators, viz., lufenuron 50 EC, flufenoxuron 10 DC, pyriproxyfen 10.8 EC, tebufenozide 20 SC, methoxyfenozide 240 SC, triflumuron 20 SC, and buprofezin 25% WP against pupal and adult suppression of Trogoderma granarium (Everts) and Tribolium castaneum (Herbst). The results about the effect of IGRs on subsequent stages after larvae indicated that all the treatments had significant impact on pupation, which escalated with an increase in concentration and exposure period. Results revealed that adult suppression was highest due to the flufenoxuron and lowest in triflumuron. Results revealed that after 7 days the lowest pupation suppression (38.18%) was observed at 2.5 ppm followed by 44.92% at 5 ppm concentrations and the pupation inhibition was highest 55.88% at 10 ppm against T. granarium. The pupation inhibition percentage in T. castaneum was highest 65.70% at 10 ppm and lowest at 2.5 ppm with value 47.85% after 7 days of treatment application. Results revealed that after 7 days the lowest adult suppression (44.63%) was observed at 2.5ppm followed by 51.42% at 5 ppm concentrations and the adult suppression was highest 62.42% at 10 ppm against T. granarium. The adult suppression percentage in T. castaneum was highest 75.61 % at 10 ppm and lowest at 2.5 ppm with value 57.91%after7 days of treatment application. Bioactivities of all the tested IGRs were found to be dose and exposure period dependent. All the IGRs are more persistence and effective when applied on wheat, than on rice and maize. From these results, it is concluded that the applications of IGRs have proved to be very effective against both species examined in the present study. These compounds particularly CSis (flufenoxuron, lufenuron and triflumuron) should be considered as potential components in IPM of stored grains insects pests. [ABSTRACT FROM AUTHOR]