• S Murugesan

      Articles written in Proceedings – Animal Sciences

    • Antibiotic effects of resorcinol, gallic acid and phloroglucinol onHeliothis armigera Hubner (Insecta: Noctuidae)

      T N Ananthakrishnan R Senrayan R S Annadurai S Murugesan

      More Details Abstract Fulltext PDF

      The antibiotic effects of 3 phenolic substances viz. resorcinol, gallic acid and phloroglucinol on the cotton bollwormHeliothis armigera Hubner were evaluated with particular reference to the feeding regimes, survival and pupation. Some of the characteristic antibiotic effects observed for resorcinol and phloroglucinol include reduction in consumption index and approximate digestability, increased efficiency of conversion of ingested food and efficiency of conversion of digested food, extended larval duration and high mortality. However, there was no alteration in the various food utilization efficiencies in the case of gallic acid treated individuals. The defensive response of the larvae to these toxic substances seems to be excessive defaecation. Frass analysis through thin-layer chromatography and ultraviolet characterisation indicated the presence of the ingested antibiotics, opening further avenues of investigation on the possible role of these antibiotics present in the frass in biological control.

    • Age-correlated tissue preferences ofHeliothis armigera (Hubner) andSpodoptera litura (F) with special reference to phenolic substances

      R S Annadurai S Murugesan R Senrayan

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      Age correlated tissue preferences ofHeliothis armigera (Hubner) andSpodoptera litura (F) were investigated onGossypium hirsutum, Abelmoschus esculentus, Ricinus communis and Cajanus cajan. The food utilization and reproductive potential of these two noctuids are correlated with the host plant nutritional and non-nutritional phenolic substances, separated and characterised through thin-layer chromatography and UV spectra. The non-nutritional phenolic substances such as phloroglucinol, resorcinol, protocatechuic acid, gallic acid, pyrogallol and vanillic acid tend to vary within the host plant parts as well as in different host plant species. Keywords.Spodoptera litura; Heliothis armigera; age-correlated tissue preferences; nonnutritional phenolic substances.

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