Heavy metals stress on the growth parameters of the cotton leaf worm, Spodoptera Littoralis (Boisd.), (Lepidoptera: Noctuidae) – International Network for Natural Sciences
Heavy metals stress on the growth parameters of the cotton leaf worm, Spodoptera Littoralis (Boisd.), (Lepidoptera: Noctuidae) – International Network for Natural Sciences
S.A. Abu Elela*, W.M. Elsayed
S.A. Abu Elela*, W.M. Elsayed
- Entomology Department, Faculty of Science, Cairo University, Giza, Egypt
Abstract
A 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.
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.
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