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Total lipid, total fatty acids and fatty acid composition of Plodia interpunctella Hübner (Lepidoptera:Pyralidae) larvae and pupae fed by hazelnut, peanut, walnut, almond, and polen were investigated. Food type-related differences in the ratio of total lipid and fatty acids were observed in larvae. The ratios of total fatty acids to total lipids also differed in larvae fed with polen , almond, hazelnut, walnut and peanut and were found as 17.39, 13.65, 13.94, 20.31 and 13.48%, respectively. However, there were no differences in the ratios of total fatty acids to total lipids in pupae. Gas chromatographic investigation of the fatty acid composition of food types revealed that the highest ratios in the foods were oleic acid (C18:1) in almond and hazelnut (67.42 and 80.11%, linoleic acid (C 18:2) for walnut and peanut (61.16 and 49.78%), linolenic acid (C18:3n-3) in polen (38.19%). Larvae fed by walnut and hazelnut exhibied the highest ratio of linoleic acid whereas the ratio of oleic acid was the highest for larvae fed by almond, polen and peanut. In the case of pupae oleic acid had highest ratio when pupae were fed by polen, almond and hazelnut. However the ratio of linoleic acid exceeded others when pupae were fed by walnut and peanut. There were also differences in other fatty acid ratios related to food type. [ABSTRACT FROM AUTHOR]