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VOL. 7, ISSUE 5 (2025)
Impact of some insect growth regulators on biochemical parameters of a fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae)
Authors
Mohamed RG Abo Elela, Ali R El Gabaly, Hayam M Saad
Abstract
The current study aimed to assess the effect
of three distinct insect growth regulators (IGRs): chitin synthesis inhibitors
(lufenuron), juvenile hormone analogs (pyriproxyfen), and ecdysone receptor
agonists (methoxyfenozide) on the biochemical parameters of Spodoptera
frugiperda larvae at the second and fourth instar stages, which were fed
leaves of castor bean treated with these compounds. According to the results,
lufenuron was the most effective compound against the S. frugiperda,
followed by pyriproxyfen, and methoxyfenozide was the least effective compound.
To assess the impact of IGRs on protein, carbohydrate, and lipid levels, as
well as the activity of chitinase, acetylcholinesterase, and
carbohydrate-hydrolyzing enzymes (amylase, invertase, and trehalase) at LC50
concentrations. In the fourth instar larvae of Spodoptera frugiperda,
all tested IGRs dramatically reduced total proteins, lipids, and carbohydrate
content, with the exception of methoxyfenozide which increased total (proteins,
carbs, and lipids) while pyriproxyfen and lufenuron which decreased total
(protein, carbs, and lipids). Lufenuron increased chitinase activity
significantly. Acetylcholinesterase activity was markedly elevated by the
tested IGRs. The tested IGRs caused a significant decrease in amylase activity,
with the exception of methoxyfenozide for fourth-instar larvae, and an increase
with all treatments for fourth-instar larvae of invertase. In contrast, all
tested IGRs treatments for fourth-instar larvae increased trehalasec activity
except lufenuron decreased the enzyme activity.
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Pages:37-41
How to cite this article:
Mohamed RG Abo Elela, Ali R El Gabaly, Hayam M Saad "Impact of some insect growth regulators on biochemical parameters of a fall armyworm, <i>Spodoptera frugiperda</i> (J. E. Smith) (Lepidoptera: Noctuidae)". International Journal of Agriculture and Plant Science, Vol 7, Issue 5, 2025, Pages 37-41
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