Nutritional Indices and Midgut Enzymatic Activity of Phthorimaea operculella (Lepidoptera: Gelechiidae) Larvae Fed Different Potato Germplasms

Authors: Mansouri, S. M.; Ganbalani, G. Nouri; Fathi, S. A. A.; Naseri, B.; Razmjou, J.

Source: Journal of Economic Entomology, Volume 106, Number 2, Pages 525-1074 , pp. 1018-1024(7)

Publisher: Entomological Society of America

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The effect of 10 potato cultivars and clones on the feeding and digestion of Phthorimaea operculella (Zeller) larvae was evaluated using larval nutritional indices and enzymatic activities. Studies were based on nutritional indices from larvae reared at 25 ± 1°C, 65 ± 5% relative humidity, and in complete darkness. The results of nutritional indices showed that conversion efficiency of ingested and digested food in the larvae at the fourth instar was the highest in Savalan cultivar at rates of 22.30 ± 0.39 and 32.87 ± 0.69%, respectively, and the lowest were recorded on Morene at rates of 15.83 ± 0.35 and 21.99 ± 0.58%, respectively. Among the different potato germplasms tested in the study, the highest proteolytic and amylolytic activities of the larvae, at optimal pH were in Morene with records of 8.204 ± 0.296 U/mg and 0.071 ± 0.0004 mU/mg, respectively; and the lowest were recorded in larvae fed on Savalan at 2.740 ± 0.131 U/mg and 0.028 ± 0.0001 mU/mg, respectively. It is concluded that Morene was the most unsuitable host for P. operculella.

Keywords: Phthorimaea operculella; digestive enzymes; nutritional indices; potato germplasms

Document Type: Research Article


Publication date: April 1, 2013

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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