Evaluation of the toxic and physiological activities of Precocene I (Anti-juvenile hormone agent) against Spodoptera littoralis Boisd. (Lepidoptera: Noctuidae)

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Evaluation of the toxic and physiological activities of Precocene I (Anti-juvenile hormone agent) against Spodoptera littoralis Boisd. (Lepidoptera: Noctuidae)

Khalid Hamadah, Karem Ghoneim
Int. J. Biosci.13( 1), 86-104, July 2018.
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Abstract

The cotton leafworm, Spodoptera littoralis is a destructive pest of cotton and various crops all over the year in Egypt as well as in some countries. Objective of the present study was to assess the effects of Precocene I (PI) on survival, growth, development and metamorphosis of this pest. Five doses: 150, 120, 90, 30 and 15 µg/larva had been topically applied (once) onto 1-day old penultimate instar larvae or 1-day old last instar larvae. Various mortality percentages were recorded among the larvae, pupae and adults. LD50 values were calculated in 70.48 and 234.96 µg/larva, after treatment of 5th and 6th larval instars, respectively. PI exerted a diverse action on the maximal body weight (max. wt) of treated larvae, depending on the dose. The larval growth was considerably inhibited. The larval duration was conspicuously shortened while the pupal duration was slightly or significantly prolonged, depending on the dose. Regardless the larval instar under treatment, the developmental rate of pupae was generally regressed. PI failed to induce the precocious pupation, regardless the applied dose. PI exerted a strong inhibitory action on the pupation, regardless the larval instar under treatment. The adult emergence was partially blocked. Some morphologically abnormal pupae were produced after treatment of 6th instar larvae with the higher two doses.

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