Larval Nutrition in Agrotis orthogonia (Lepidoptera: Phalaenidae) : Digestive Enzymes

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Abstract
The structure of the alimentary system in the larva of Agrotis orthogonia Morr. is described in comparison with published descriptions of related species. A very weak amylase was found in extracts of the ground mandibular glands; a sucrase and a surface active agent were found in extracts of the labial glands; a sucrase, a lipase, and a very weak amylase were found in extracts of the gut. No proteolytic enzymes were found. The results of chemical and microscopical examination of food materials and excreta agreed with these findings. The significance of these results in relation to larval habits is discussed and it is concluded that the insect takes advantage of the breakdown of protein by enzymes in the growing plant.

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