Uptake and distribution of three insect growth regulators — diflubenzuron, flucycloxuron and halofenozide — in pupae and adults ofTenebrio molitor |
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| Authors: | Souad Chebira Noureddine Soltani Sarah Muylle Guy Smagghe |
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| Institution: | 1. Laboratoire de Biologie Animale Appliquée, Département de Biologie, Faculté des Sciences, Université d’Annaba, 23000, Annaba, Algérie
2. Laboratory of Agrozoology, Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, B-9000, Ghent, Belgium
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| Abstract: | In a topical bioassay with pupae and adults of the mealwormTenebrio molitor (Coleoptera: Tenebrionidae), an important pest in stored products worldwide, three insect growth inhibitors (IGRs) were tested:
the two chitin synthesis inhibitors diflubenzuron and flucycloxuron, and the ecdysone agonist halofenozide (RH-0345). To address
differences in toxicity, we determined with the use of a14C-labeled isotope, the pattern of absorption through the cuticle and then the distribution in the different body tissues of
gut, hemolymph, integument and reproductive organs (ovaries, testis). The rate of absorption through the cuticle was highest
for flucycloxuron, and this concurred with its high toxicity. In general, the patterns of absorption followed a similar trend
in young and old pupae and in the adult stage. Accumulation in the reproductive system of females and males was relatively
high, which may explain the strong reproductive effects of the IGRs tested. In addition, we recorded large differences in
the clearance of insecticide from the insect bodyvia the excrements, with the chitin synthesis inhibitors exhibiting higher rates than halofenozide. |
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