International Research Journal of Insect Sciences

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No. 1

Olfactory Response of an Assassin Bug, Rhynocoris Longifrons (Insecta: Hemiptera: Reduviidae) To the Hexane Extracts of Different Agricultural Insect Pests

Pages: 12-19
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Olfactory Response of an Assassin Bug, Rhynocoris Longifrons (Insecta: Hemiptera: Reduviidae) To the Hexane Extracts of Different Agricultural Insect Pests

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A. Ganesh Kumar , Dunston P. Ambrose

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A. Ganesh Kumar , Dunston P. Ambrose (2014). Olfactory Response of an Assassin Bug, Rhynocoris Longifrons (Insecta: Hemiptera: Reduviidae) To the Hexane Extracts of Different Agricultural Insect Pests. International Research Journal of Insect Sciences, 1(1): 12-19. DOI:
The predator-prey interaction of five prey species with the assassin bug, Rhynocoris longifrons (Stål) (Hemiptera: Reduviidae) was assessed in a Y-shaped olfactometer and the prey preference was assessed in six-arm olfactometer provided with the bodyextracts in hexane. Although R. longifrons responded to all the hexane extracts of testedinsect pests, R. longifrons showed maximum response to the lepidopterans Spodoptera litura (F.) (6.67±1.18 min), Helicoverpa armigera (Hübner) (5.17±0.89 min) and Achaea janata (L.) (4.42±1.04 min) followed by the coleopteran Mylabris indica (Thunberg) (3.00±0.82 min) and the least response to the hemipteran Dysdercus cingulatus (F.) (2.42±0.76 min).Thus, the present study clearly reveals the order of the host preference of R. longifrons to the tested hexane extracts of the taxonomically diverse insect pests.
Contribution/ Originality
This paper contributes the first hand information on the allelochemical interaction of Rhynocoris longifrons with its prey species Spodoptera litura, Helicoverpa armigera, Achea janata, Dysdercus cingulatus and Mylabris indica and reveals its prey preference. It also enables one to employ R. longifrons as a biocontrol agent against these insect pests.

Mechanisms of the Decline in Reproductive Fitness with Age in the Moth Spodoptera Litura

Pages: 1-11
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Mechanisms of the Decline in Reproductive Fitness with Age in the Moth Spodoptera Litura

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Jin-Feng Yu , Qin Lu , Yan-Ying Li , Jin Xu , Hui Ye

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Jin-Feng Yu , Qin Lu , Yan-Ying Li , Jin Xu , Hui Ye (2014). Mechanisms of the Decline in Reproductive Fitness with Age in the Moth Spodoptera Litura. International Research Journal of Insect Sciences, 1(1): 1-11. DOI:
 Although several hypotheses have been proposed, the mechanisms underlying the decline in reproduction of insects with age remain unclear. In this study, the effect of aging on the reproductive performance of both sexes was studied in Spodoptera litura. Aging in both sexes significantly reduced reproductive fitness. Female aging had a significantly stronger effect than male aging on fecundity and fertility. This study clearly demonstrates that oviposition by virgin females is an important contributor to the decline in female fecundity with delayed mating. However, the reduction in fecundity in females mated late relative to females mated early was much greater than (almost three times) the number of eggs laid by virgin females before mating. What accounts for this additional loss in fecundity? To answer this question, egg production, oosorption, mating frequency and longevity in both sexes were analysed. The results suggest that S. litura females may emerge with extra nutrient reserves that can be allocated to adult survival and egg production; delayed mating may cause females to allocate more resources towards survival, leaving less for egg production after mating relative to females mated young. This mechanism is likely the key cause of the decline in fecundity due to aging. In addition, the fertility rate was significantly influenced by female, but not male, age at mating, suggesting that senescence degraded egg quality but not sperm quality. The results of this study also showed that the mating frequency of moth pairs was negatively correlated with male age at mating, which is likely the primary mechanism underlying the negative effects of male aging on female reproductive success.


Contribution/ Originality