Action of a novel insect growth regulator tebufenozide against different developmental stages of four stored product insects
1996
Smagghe, G. (Gent Univ. (Belgium). Faculty of Agricultural and Applied Biological Sciences) | Salem, H. | Tirry, L. | Degheele, D.
Tebufenozide, representing a new group of insect growth regulators with a new and selective mode of action, i.e. the nonsteroidal ecdysteroid agonists, was tested for efficacy against different stages of four important stored product pests. Administration via larval diet was an effective way to kill last-instar larvae of the Indeanmeal moth, Plodia interpunctella and Mediterranean flour moth, Ephestia kuehniella; LC50 was calculated to be about 0.3-0.6 mg active ingredient per kg diet. Treated larvae underwent head capsule apolysis leading to double head capsule formation, lost weight and died without splitting off the old cuticle. The salient effects of moult induction and growth inhibition agree with the specific activity of tebufenozide and confirm its (hyper) ecdysteroid-mimicking action. After single topical application on adults of P. interpunctella, egg-laying was halted in a dose-dependent manner. In addition, the egg-to-adult development of P. interpunctella in treated diet was strongly affected. A concentration of 1 mg active ingredient per kg diet resulted in a mortality of 50 per cent, while 10 mg a.i. per kg diet caused 100 per cent death. In great contrast, continuous exposure to tebufenozide over two months in treated diet had no effects on the development and performance in two coleopteran pests, the red flour beetle, Tribolium castaneum and the broadhorned flour beetle, Gnathocerus cornutus. Taken together, the obtained data suggest that tebufenozide has potential for use as a selective insecticide in stored product industry, especially against Lepidoptera.
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