The greater wax moth, Galleria mellonella (Linnaeus) (Lepidoptera: Pyralidae) is the most destructive pest of honey bee, Apis mellifera Linnaeus (Hymenoptera: Apidae), throughout the world. The present study was conducted to determine the quantitative and qualitative impairing effects of the arthropod venoms, viz., death stalker scorpion Leiurus quinquestriatus (Hemprich & Ehrenberg) venom (SV), oriental Hornet (wasp) Vespa orientalis Linnaeus venom (WV) and Apitoxin of A. mellifera (AP) on the larval haemogram. For this purpose, the 3rd instar larvae were treated with LC50 of each of these venoms (3428.9, 2412.6, and 956.16 ppm, respectively). The haematological investigation was conducted in haemolymph of the 5th and 7th (last) instar larvae. The important results could be summarized as follows. Five basic types of the freely circulating haemocytes in the haemolymph of last instar (7th) larvae of G. mellonella had been identified: Prohemocytes (PRs), Plasmatocytes (PLs), Granulocytes (GRs), Spherulocytes (SPs) and Oenocytoids (OEs). All venoms unexceptionally prohibited the larvae to produce normal hemocyte population (count). No certain trend of disturbance in the differential hemocyte counts of circulating hemocytes in larvae of G. mellonella after treatment with the arthropod venoms. Increasing or decreasing population of the circulating hemocytes seemed to depend on the potency of the venom, hemocyte type and the larval instar.  In PRs of last instar larvae, some cytopathological features had been observed after treatment with AP or WV, but SV failed to cause cytopathological features. With regard to PLs, some cytopathological features had been observed after treatment with AP while both SV and WV failed to cause cytopathological features in this hemocyte type. No venom exhibited cytopathological effects on GRs, SPs or OEs.

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Background The larvicidal and biochemical effects of chitin synthesis inhibitors (CSIs), namely lufenuron, flufenoxuron and hexaflumuron against the newly molted penultimate instar larvae of the house fly Musca domestica, were investigated. Methods Different concentrations from each tested compound were applied on forty individuals of M. domestica 2nd instar larvae. Four replicates were used for each concentration. Results The recorded LC25 and LC75 values were (166.11, 68.33 and 56.43 ppm) and (732.33, 283.02 and 248.45 ppm) for lufenuron, flufenoxuron and hexaflumuron, respectively. The results showed significant (P < 0.05) increase of mortality in larvae treated with different tested CSIs compounds. Mortality was greater in larvae treated by hexaflumuron than lufenuron and flufenoxuron. The main metabolites were tested in the larval whole-body tissue homogenate and findings could be summarized as follows: tested concentrations of CSIs (a) predominantly reduced the total carbohydrate, protein, lipid and cholesterol content at certain ages tested. (b) Disturbed the total carbohydrate content particularly for larvae treated with LC75 concentration of hexaflumuron. (c) Exerted the protein and lipid profiles and this effect was much more pronounced in larvae treated with hexaflumuron. (d) Reduced the quantitative cholesterol content and this reduction was found to be increased with development. Conclusions Tested CSIs in particular hexaflumuron showed remarkable larval toxicity and reduced the main metabolites content in the larval whole-body tissue homogenate of the house fly, M. domestica.