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Background The greater wax moth,  Galleria mellonella  (L.) (Lepidoptera: Pyralidae), is the major devastating insect pest of beekeeping industry all over the world; however their larvae were valuable to be the most favorable alternative invertebrate model. For this purpose, new-hatched larvae were reared on five different nutritional diets based on: old wax-comb (natural food); wheat flour diet ( Triticum aestivum  L.); soybean diet ( Glycine max ); wheat germ diet; and date syrup diet ( Phoenix dactylifera  L.) till reaching the fully grown 6 th  instars to evaluate their fitness and hemocytic responses. Results Fully grown larvae from soybean diet had the highest rates of fresh (280 mg) and dry weights (104 mg), water contents (175.6 mg), carbohydrates (1.97%), total hemocyte count (THC) (4746/mm 3 ), total soluble solid (TSS) (21.7%), hemolymph protein concentration (HPC) (1662.5 mg/100 ml), and hemolymph content (density 3.82 mg/µl and volume 70.35 µl/larva), followed by wheat germ diet in comparable to the natural food. All suggested diets considered as rich protein-materials; recording high protein rates on their larvae (39.51–41.87%), with only the exception of old wax-comb had the lowest one (36.63%). Moreover, five types of hemocytes were classified in the larval hemolymph as (prohemocytes (PR), plasmatocytes (PL), granulocytes (GR), oenocytoids (OE) and spherulocytes (SP)), but with different rates related to different diets. Regardless the rearing diets, PR type was the most frequently recorded cell type (73.31%) in hemolymph, followed by PL (8.37%), and the lowest one was OE cells (5.82%). Conclusions The suggested diets of soybean and wheat germ recorded the best results than the other diets used almost, and could be recommended as standard diets to mass-produce healthy and high-quality  G. mellonella  for in vivo experimentation and/or microbiological studies.

journal of basic and applied zoology /journal of basic and applied zoology

Impact of different diets' nutrition on the fitness and hemocytic responses of the greater wax moth larvae, Galleria mellonella (Linnaeus) (Lepidoptera: Pyralidae)