Juvenile hormone-like and anti-gonadotropic activities of Fluoromevalonate against the Egyptian cotton leaf worm Spodoptera littoralis Boisd. (Lepidoptera: Noctuidae)

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Juvenile hormone-like and anti-gonadotropic activities of Fluoromevalonate against the Egyptian cotton leaf worm Spodoptera littoralis Boisd. (Lepidoptera: Noctuidae)

Ahmad Basiouny, Karem Ghoneim
Int. J. Agron. Agri. Res.11( 4), 6-30, October 2017.
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Abstract

The cotton leaf worm, Spodoptera littoralis is destructive pest of cotton and various crops all over the year in Egypt. The present study was carried out aiming to assess the effects of the anti-JH compound, Fluoromevalonate (FMev), on survival, growth, development, metamorphosis and reproductive potential of this pest. Four doses: 100, 50, 25 and 5 µg/larva had been topically applied (once) onto newly moulted 5th (penultimate) instar larvae and newly moulted 6th (last) instar larvae. FMev exhibited a weak toxicity against larvae, pupae and adults. LD50 values were estimated in 42.03 and 629.20 µg/larva, after treatment of 5th and 6th larval instars, respectively. FMev inhibited the larval growth when applied onto 5th instar larvae but promoted it after treatment of 6th instar larvae. The larval was remarkably shortened, but the pupal duration was slightly or remarkably prolonged, depending on the treated larval instar. FMev failed to exhibit anti-JH activity but a JH-like activity against this insect. The pupation rate was regressed. Treatment of 6th instar larvae with FMev resulted in the production of morphologically abnormal pupae, at the higher three doses. FMev exhibited a blocking effect on the adult emergence. FMev exhibited potent anti-gonadotropic activity against S. littoralis, since complete sterilization was recorded.

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