Sublethal effects of fenoxycarb on female reproduction in Helicoverpa armigera (Lepidoptera: Noctuidae)

The cotton bollworm, Helicoverpa armigera (Hünber) (Lepidoptera: Noctuidae), is a polyphagous pest that causes severe damage to economical crops in most parts of the world. The juvenile hormone analogues are a group of insect growth regulators that increase larval ages and disrupt larval development...

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Bibliographic Details
Published in:Canadian entomologist 2023-10, Vol.155, Article e31
Main Authors: Izadpanah, Abouzar, Mikani, Azam, Moharramipour, Saeid
Format: Article
Language:English
Subjects:
Agrochemicals
Artificial diets
Cotton
Crop damage
Developmental stages
Ecdysone
Enzymes
Fecundity
Females
Fenoxycarb
Fertility
Gametocytes
Gene expression
Genes
Growth regulators
Helicoverpa armigera
Homogenization
Hormones
Insecticides
Insects
Juvenile hormones
Juveniles
Larvae
Larval development
Larval stage
Lepidoptera
Longevity
Noctuidae
Oocytes
Ovaries
Oviposition
Pesticides
Pests
Pupae
Pupation
Reagents
Receptors
Reproduction
Reproductive system
Research Paper
Ribonucleic acid
RNA
Sublethal effects
Survival
Vitellogenin
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Summary:The cotton bollworm, Helicoverpa armigera (Hünber) (Lepidoptera: Noctuidae), is a polyphagous pest that causes severe damage to economical crops in most parts of the world. The juvenile hormone analogues are a group of insect growth regulators that increase larval ages and disrupt larval development. Moreover, they affect reproductive system in adult insects. In this study, the effects of sublethal doses of fenoxycarb on fecundity, fertility, and longevity parameters, as well as on oocyte size, ecdysteroid titer in ovaries, and expression level of the ultraspiracle (USP), ecdysone receptor (EcR), hormone receptor 3 (HR3), and vitellogenin (Vg) genes in adult female H. armigera, were examined. Feeding on artificial diet containing fenoxycarb (LC10 and LC25) significantly decreased the percentage of larval survival rate, pupation rate, pupal weight, fecundity, fertility, and oviposition period. It also clearly shortened female longevity. Fenoxycarb treatment suppressed the expression of the USP, EcR, and Vg genes in H. armigera but had no effect on the HR3 gene expression level in either pupae or adults. Overall, our results show that using fenoxycarb as a juvenile hormone analogue can reduce reproduction in H. armigera and may work as an alternative to the use of insecticides for controlling this important agricultural pest.
ISSN:0008-347X
1918-3240
DOI:10.4039/tce.2023.18