The lethal effects of three insect juvenile hormone analogues on the developmental stages of Ephestia cautella (Wlk.) (Lepidoptera: Phycitidae)

Shaaya, Eli; Pisarev, V. E.

doi:10.1016/0022-474x(86)90004-4

Cited by 10 publications

(4 citation statements)

References 19 publications

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“…Methoprene at a concentration of 10 and 100 µg caused 11.00 and 16.67% larval mortality respectively in the last larval instar of C. cephalonica (Deb and Chakravorty, 1985) and larvae attained extraordinary giant size without undergoing extra moult. Similar observations have also been reported by the action of different JHAs exposed to Tribolium castaneum (Ishaaya and Yablonski, 1976), Tribolium confusum (Smet et al, 1989) and Ephestia cautella (Shaaya and Pisarev, 1986). 4 th instar larvae of Tribolium castaneum exposed to 10 ppm concentration of pyriproxyfen also resulted 15.00 ± 0.49 % larval mortality (Elbarky et al, 2012).…”

Section: Effect Of Pyriproyfen On Larval Mortalitysupporting

confidence: 80%

Juvenile Hormone Analogue and Management of Rice Moth, Corcyra cephalonica Staint. (Lepidoptera: Pyralidae)

Priyanka,

Keshav,

Krishna

2024

Intern. J. Bio. Env. Invest.

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A concentration of 25 ppm of pyriproxyfen, when exposed to 1 st instar larvae, caused 100% larval mortality but the same dose level when exposed to 2 nd , 3 rd and 4 th instar larvae it resulted comparatively poor larval mortality i.e. 96. 00 ± 2.83, 86.40 ± 5.58 and 46.40 ± 3.19%, respectively. In case of 1 st instar larval treatment 20 ppm concentration of pyriproxyfen caused 5.60 ± 0.44% pupation but all of them get perished. At a concentration of 15 ppm of pyriproxyfen 20.00 ± 1.18% adult emergence did occur in case of 1 st instar treated larvae whereas it resulted into gradually enhanced adult emergence i.e. 42.40 ± 2.19, 64.00 ± 1.21 and 73.60 ± 2.19 % in case of 2 nd , 3 rd and 4 th instar treated larvae, respectively. It is obvious that exposure of pyriproxyfen for longer duration severely affects the growth and development of the larva in comparison to short tenure exposure of JHA. In addition, longer duration exposure of pyriproxyfen resulted in abnormal metamorphosis that produced larval-pupal and pupal-adult intermediates.

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Section: Effect Of Pyriproyfen On Larval Mortalitysupporting

confidence: 80%

Juvenile Hormone Analogue and Management of Rice Moth, Corcyra cephalonica Staint. (Lepidoptera: Pyralidae)

Priyanka,

Keshav,

Krishna

2024

Intern. J. Bio. Env. Invest.

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“…JHAs at the mature larval stage induce juvenilization of the treated larva when the natural hormone is absent in the body. Hence, these compounds inhibit pupation of the treated larvae, which continue to moult and produce "giant" or "supernumerary larvae", as reported in Tribolium beetles (PALLOS et al 1971, ISHAAYA & YABLONSKI 1976, RAO 1977, EL-SAYED 1987, SHAAYA & PISAREV 1988, SMET et al 1989, Plodia interpunctella HÜBNER, 1816(KRAMER & MCGREGOR 1979 and in Ephestia cautella WALKER, 1863(SHRIVASTAVA 1983, SHAAYA & PISAREV 1986, 1988. Concentrations from 1 to 100 ppm of different JHs have been reported to produce such giant larvae in Tribolium beetles.…”

Section: Discussionmentioning

confidence: 86%

Potential of an Insect Growth Regulator in the Management of the Rice Moth Corcyra Cephalonica Stainton, 1866 (Lepidoptera: Pyralidae)

Tripathi¹,

Tiwari²

2014

Polish Journal of Entomology / Polskie Pismo Entomologiczne

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The present investigation reveals the influence of methoprene, an IGR, on the ontogeny, growth duration and adult longevity of the rice moth Corcyra cephalonica. Twenty-five larvae of different instars (1st, 2nd, 3rd and 4th) of C. cephalonica were exposed to the juvenile hormone analogue methoprene in order to evaluate its potential effect on larval mortality, pupation, pupal mortality, adult emergence, growth duration and adult longevity. These different instars larvae were treated with 2, 4, 8 and 12 ppm of methoprene in an artificial diet (coarsely ground jowar mixed with 5% yeast powder) where the control received acetone alone. The results reveal significant differences in all the parameters mentioned above as compared to the control.

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“…Diapause cannot be achieved without careful timing and balance of hormonal transitions. This is best demonstrated through the well-documented developmental lethality of topical JH, or the many partial diapause phenotypes achievable through piecewise interventions in endocrine signaling ( Spielman and Williams, 1966 ; Shaaya and Pisarev, 1986 ). Evolution has arrived at this balance on many occasions, given the different—and sometimes opposing—ways that different species initiate diapause.…”

Section: Future Directions and Conclusionmentioning

confidence: 99%

Endocrine Regulation of Lifespan in Insect Diapause

Hutfilz

2022

Front. Physiol.

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Diapause is a physiological adaptation to conditions that are unfavorable for growth or reproduction. During diapause, animals become long-lived, stress-resistant, developmentally static, and non-reproductive, in the case of diapausing adults. Diapause has been observed at all developmental stages in both vertebrates and invertebrates. In adults, diapause traits weaken into adaptations such as hibernation, estivation, dormancy, or torpor, which represent evolutionarily diverse versions of the traditional diapause traits. These traits are regulated through modifications of the endocrine program guiding development. In insects, this typically includes changes in molting hormones, as well as metabolic signals that limit growth while skewing the organism’s energetic demands toward conservation. While much work has been done to characterize these modifications, the interactions between hormones and their downstream consequences are incompletely understood. The current state of diapause endocrinology is reviewed here to highlight the relevance of diapause beyond its use as a model to study seasonality and development. Specifically, insect diapause is an emerging model to study mechanisms that determine lifespan. The induction of diapause represents a dramatic change in the normal progression of age. Hormones such as juvenile hormone, 20-hydroxyecdysone, and prothoracicotropic hormone are well-known to modulate this plasticity. The induction of diapause—and by extension, the cessation of normal aging—is coordinated by interactions between these pathways. However, research directly connecting diapause endocrinology to the biology of aging is lacking. This review explores connections between diapause and aging through the perspective of endocrine signaling. The current state of research in both fields suggests appreciable overlap that will greatly contribute to our understanding of diapause and lifespan determination.

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The lethal effects of three insect juvenile hormone analogues on the developmental stages of Ephestia cautella (Wlk.) (Lepidoptera: Phycitidae)

Cited by 10 publications

References 19 publications

Juvenile Hormone Analogue and Management of Rice Moth, Corcyra cephalonica Staint. (Lepidoptera: Pyralidae)

Juvenile Hormone Analogue and Management of Rice Moth, Corcyra cephalonica Staint. (Lepidoptera: Pyralidae)

Potential of an Insect Growth Regulator in the Management of the Rice Moth Corcyra Cephalonica Stainton, 1866 (Lepidoptera: Pyralidae)

Endocrine Regulation of Lifespan in Insect Diapause

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