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Amylase/proteinase ratios in larval midguts of ten stored‐product insects

Amylase/proteinase ratios in homogenates of isolated midguts of 4 granivorous beetles, Sitophilus oryzae (L.), Sitophilus granarius (L.), Tenebrio molitor L., and Tribolium castaneum (Herbst), which feed primarily on cereals or cereal products, were extremely high relative to those of Dermestes maculatus DeGeer, Attagenus unicolor (Brahm) (= A. megatoma (F.)), Anthrenus flavipes LeConte, and Tineola bisselliella (Hummel). The latter 4 species, which can feed and develop on diets of animal products or foods with relatively high protein content, had higher general proteinase (caseinolytic activity) and aminopeptidase activity and much higher proteinase/amylase ratios than the granivorous coleopterans. Larvae of the moths Anagasta kuehniella (Zeller) and Plodia interpunctella (Hubner) had much lower amylase levels and higher proteinase levels than S. oryzae, S. granarius, T. molitor, or T. castaneum. These moth larvae also feed on cereals and cereal products but have more varied feeding habits than the Coleoptera. The enzymology related to initial stages of digestion of large food polymers reflects the biochemical adaptation of these stored‐product insects to their preferred foods.