• B V David

      Articles written in Proceedings – Animal Sciences

    • Influence of biochemical parameters of different hosts on the biology ofEarias vittella (Fab.) (Noctuidae: Lepidoptera)

      R Sundararaj B V David

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      The present study aims to understand the influence of biochemical parameters of the host plants vizAbelmoschus esculentus L.,Gossypium hirsutum L. andAbutilon indicum G. Den. on the reproductive biology ofEarias vittella. The results indicate remarkable variation in the biochemical parameters of host plants which affected significantly the growth index and reproductive potential of the insect species. Decrease in body weight, fecundity, prolongation of larval period, percentage of larva becoming adult and adult longevity of both male and female was observed when reared onAbutilon indicum which had less amount of reducing sugars, protein and free amino acids but had high amount of non reducing sugars. Decreased larval period, increased fecundity and adult longevity were observed when reared on cotton and okra which had high amount of reducing sugars, free amino acids and protein. There was no significant difference in the amount of total soluble sugars among the 3 hosts tested. The growth index and fecundity ofEarias vittella are apparently high on okra than on cotton. It is observed that high amount of reducing sugars, free amino acids and protein seems to be favourable for increase in fecundity ofEarias vittella.

    • Biosystematics of Aleyrodidae (Homoptera: Insecta)

      B V David

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      The sarcity of positively associated stages of adults of both sexes and the remarkably little variation shown by the adults of a very few species studied have naturally led to the recognition of the so-called pupal cases, the exuviae of the IV instar nymphs in the matter of generic and specific classification of the aleyrodids—a rather unusual procedure in the taxonomic study of these insects. This stage is the one most often collected and known in the species world over and also possesses a multitude of diagnostic features than in any other stage.

    • Biology ofAphanogmus fijiensis (Fernere) (Hymenoptera: Ceraphronidae) a hyperparasite ofDiaphania indica (Saunders) (Lepidoptera: Pyralidae) throughApanteles taragamae Viereck (Hymenoptera: Braconidae)

      Clement Peter B V David

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      Studies were conducted on the hyperparasiteAphanogmus fijiensis (Fernere) (Hymenoptera: Ceraphronidae) to determine its biology throughApanteles taragamae Viereck (Hymenoptera: Braconidae).Aphanogmus fijiensis is a gregarious ectoparasite and developed on the prepupal and pupal stages of Apanteles taragamae present inside the host cocoon. Mean development time from egg to adult was 12–28 days at 26·43±2·53°C. There is no preoviposition period; the host is paralysed before oviposition, freshly formed to 3-day old cocoons are preferred for oviposition and mean longevity for both sexes was 4·86 days.

    • Influence of biochemical parameters of host plants on the biology ofDialeurodes vulgaris Singh (Aleyrodidae: Homoptera)

      R Sundararaj B V David

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      The influence of biochemical parameters of the host plants viz.Jasminum multiflorum Andr.,Jasminum sambac Ait.,Jasminum grandiflorum Linn.,Jasminum auriculatum Vahl.,Jasminum pubescens Willd. andJasminum flexile Vahl. on the biology of Dialeurodes vulgaris was studied. The results indicate remarkable variation in the biochemical parameters of host plants which affected significantly the biology of the insect. The per cent survival and growth index have been considerably low inJasminum pubescens, Jasminum auriculatum andJasminum grandiflorum and the same trend has been noticed with regard to fecundity and longevity also. The most preferred hosts have beenJasminum sambac andJasminum multiflorum. It is observed that high amount of phenol and excessive accumulation of sugars in host plants make them nonpreferred while high amount of amino acids makes the plants more preferred byDialeurodes vulgaris.

    • Biology ofApanteles machaeralis Wilkinson (Hymenoptera: Braconidae) a parasite ofDiaphania indica (Saunders) (Lepidoptera: Pyralidae)

      Clement Peter B V David

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      Studies were conducted on the endoparasiteApanteles machaeralis Wilkinson (Hymenoptera: Braconidae) to determine its biology whenDiaphania indica (Lepidoptera: Pyralidae) is its host. Eggs were deposited in host larvae and increased greatly in size before hatching. The first instar larva was very active with functional mandibles, whereas the second stage larva was quiescent. The third instar larva spins its cocoon outside the body of the dead host. Mean development time from egg to adult was 12·63 days at 29·25 ± 1·82°C and 59-66% RH. There is no preoviposition period. The sex ratio was 1:1·22 (males/females). Mean adult longevity was not significantly different for males (9·31 days) and females (11·68 days).

    • Biology ofTetrastichus pantnagarensis (Hymenoptera: Eulophidae) a hyperparasite ofDiaphania indica (Lepidoptera: Pyralidae) throughApanteles taragamae (Hymenoptera: Braconidae)

      Clement Peter B V David

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      Tetrastichus pantnagarensis Khan (Hymenoptera: Eulophidae) was recorded as a hyperparasite ofDiaphania indica (Saunders) (Lepidoptera: Pyralidae) throughApanteles taragamae Viereck (Hymenoptera: Braconidae). Studies were conducted on its biology. This solitary endoparasite oviposited in the host pupa within the host cocoon and the larva passes through 3 instars. Mean development time from egg to adult is 12–18 days at 26–43±2–53°C. After a preoviposition period of 1–2 days oviposition continued for 7–10 days. Mean adult longevity for males was 8·51 days and for females 11·41 days.

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