Comparative Efficacy of Three Synthetic Igrs (Bruce, Runner and Falcon) on the Development of Trogoderma Granarium (Everts) (Coleoptera: Dermestidae)

Abstract

In the present research three IGR's viz bruce , Falcon and Runner with different concentrations 0.03, 0.06 and 0.09 were tested against Trogoderma granarium under laboratory conditions.. Different dilutions of IGRs were prepared using distilled water and were applied on grains which were air dried before insect release. Twenty grubs (7 days old) were allowed to feed treated grains and data were recorded for larval mortality, larval weight, pupal and adult emergence. On overall basis at larval stage pyriproxifen gave best results, causing mean mortality 7.08% followed by Methoxyfenazide (Runner) with mean value 5.83% while Tebufenazide (Falcon) caused minimum mortality 3.33% at maximum concentration 0.09 ppm. Mortality and concentration showsed positive correlation while mortality and interval showed negative correlation. All the three IGR's showed good impact on the reduction of larval weight. Pyriproxifen (Bruce) caused 32.49% t larval weight reduction over control with mean value 4.27 (unit ?) followed by methoxyfenazide (Runner) which gave 29.82% larval weight reduction followed by control mean value 4.73. Tebufenazide (Falcon) gave minimum 26.40% larval weight reduction over control with mean value 2.61 (unit ?). Similarly, regarding pupal development, , pyriproxifen gave highest percent pupal reduction over control 75.26% with mean value 5.34 while Tebufenazide gave minimum pupal percent reduction over control 63.22% with mean value 6.64.

Sublethal phosphine fumigation induces transgenerational hormesis in a factitious host, Corcyra cephalonica

“…96 To counteract the lowered energy pressure caused by pesticides, the insects may have used all body carbohydrate reserves as the principal source of energy production to deal with the stress. [97][98][99] The increased protein and lipid contents of the host can have beneficial effects in terms of parasitoid development. [100][101][102] Similar results also were obtained in the current study.…”

“…Offspring whose mothers were exposed to insecticide are expected to be heavier and to accumulate more lipids than unexposed mothers 96 . To counteract the lowered energy pressure caused by pesticides, the insects may have used all body carbohydrate reserves as the principal source of energy production to deal with the stress 97–99 . The increased protein and lipid contents of the host can have beneficial effects in terms of parasitoid development 100–102 .…”