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Theses

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1981 - 19874
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Subject: Agricultural Entomology × Author: KAU × End date: 1987 × Start date: 1981 × Type: Thesis × Thesis Type: Ph.D ×
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Now showing 1 - 4 of 4
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    ThesisItemOpen Access
    Persistence and metabolism of phorate in rice plants and in different soil types of Kerala and its effect on non target organisms
    (Division of Agricultural Entomology, College of Agriculture, Vellayani, 1987) Naseema Beevi, S; KAU; Visalakshi, A
    The uptake, persistence and metabolism of phorate in rice plants and in different types of soil, viz., alluvial, sandy and lateritic loam when applied at 3 doses and 3 growth stages of the crop were studied by conducting field experiments. In these studies, the insecticides was applied as granules at 3 doses of 1.0, 1.25 and 1.5 kg ai/ha at 20, 40 and 60 days after planting. The residues were estimated colorimetrically and by bioassay. The metabolites in plants and soil were separated by T.L.C and further estimated colorimetrically at intervals of 2,7 and 14 days after application. The ultimate residues of the insecticide in grain and straw also were determined.
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    ThesisItemOpen Access
    Nuclear polyhedrosis of Opisina arenosella WLK. (= Nephantis serinopa Meyr;) (Cryptophasidae: Lepidoptera) and its utility for the control of the pest
    (Department of Agricultural Entomology, College of Agriculture, Vellayani, 1985) Babu, M Philip; KAU; Mohandas, N
    The black headed caterpillar, Opising arenosella Hlk. (= Nephantis serinopa Meyrick) is a serious pest of coconut. The slender caterpillars found under the leaves in galleries made of silk and foreign matter feed on the chlorophyll tissues . Philip et al., (1982) reported the occurrence of a nuclear polyhedrosis virus in the larvae of O. arenosella. Basic information for judging the suitability of this pathogen for the control of the pest were lacking. Hence detailed studies were made on the symptamatology, morphology of the pathogen, histopathology, mode of transmission of the virus to the progeny, cross infectivity to other species of lepidoptera, bioassay of the virus , persistence of the virus on coconut foliage , effect of physical factors on the persistence of the virus, safety of the pathogen to non target organisms and the efficacy of the virusin controlling the pest in field.
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    ThesisItemOpen Access
    Biology, Bionomics and control of coconut cockchafer Leucopholis coneophora Burm.
    (Division of Agricultural Entomology, College of Agriculture, Vellayani, 1983) Abraham, V A; KAU; Mohan Das, M
    The biology of the coconut cockchafer Leucopholic coneophora Burm. was studied in detail for the first time. Techniques for rearing the pests from egg to adult in potted palnts kept in field were standardized. The egg laying behaviour of adults was observed. The morphological changes off eggs, different instars of grubs and pupae during development were studied in detail. The changes in immature stages of male and female insects were traced separately. The general morphology of different instars of the grubs was studied in full with a view to finding distinct identifying characters for each.
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    ThesisItemOpen Access
    Use of insecticides as granules for protecting paddy crop against pests
    (Division of Agricultural Entomology, College of Agriculture, Vellayani, 1981) Sasidharan, Pillai K; KAU; Gopalakrishnan, Nair N R