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Heavy metals stress on the growth parameters of the cotton leaf worm, Spodoptera Littoralis (Boisd.), (Lepidoptera: Noctuidae)

S.A. Abu Elela, W.M. Elsayed

Entomology Department, Faculty of Science, Cairo University, Giza, Egypt

Key words: Cotton leaf worm, Spodoptera littoralis, Heavy metals, Growth parameters.

Abstract

egyptian-cotton-leafworm-2_bigA Large number of insects are influenced easily by a number of pollutants; such as cadmium (Cd) and lead (Pb). Cadmium has an increasing international concern because its toxicity is generally considered to be much higher than those of other heavy metals. In this research, we tried to evaluate the effects of both cadmium and lead on the larval and pupal durations together with adult longevity. From the obtained results, we found that cadmium (Cd) treatment disturbed larval development, metamorphosis and decreased the survival of both larvae and pupae. The mean total percentage survival of the larvae fed castor bean leaves treated with cadmium was significantly lower than that of the control and the lead treatments. It was observed that, percentage pupation was successful under lead treatment (93% percentage pupation) and the percentage larval survival recorded the highest value (94%) compared with those of the control and cadmium treatments. Our research assumed that lead does not affect the growth parameters of the insect.

Get the original articles in English: http://www.innspub.net/volume-6-number-4-april-2015-jbes/

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