Browsing by Author "Joseph, K V"
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Item Biology of the pea leaf roller, Nacoleia vulgalis Guence. (Lepidoptera :Pyralidae)(Kerala Agricultural University, Vellanikara, 1964) Mammen, K V; Joseph, K VItem Biology of the pepper top shoot borer Laspeyresia hemidoxa Meyr. (Eucosmidae:Lepidoptera)(Kerala Agricultural University, Vellanikara, 1964) Visalakshi, A; Joseph, K VItem Insect pests of stored tapioca (Manihot utilissima Pohl) in Kerala : notes on the biology of a new pest, Pyralis Manihotalis Guen. (PYRALIDAE)(Kerala Agricultural University, Vellanikara, 1963) Joseph, K VItem Review of the insect pests of pulsecrops and studies on the biology of the pea leaf roller Nacoleia vulgalis Guence (Pyralidae)(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1963) Mammen, K V; Joseph, K VLiterature on the insect pests of the important pilse crops, with special reference to the work done in India has been reviewed. The biology and bionomics of the pea leaf roller Nacoleia vulgalis Gn. (Pyralidae) have been worked out in detail. The moths mate a day after emergence. The female moth lays creamy yellow, oval, scale like eggs during night in rows, generally on tender leaves . On an average , about 542 eggs are laid by one female. Incubation period is 4 days. Larval period lasts 13 to 15 days, the larva undergoing five instars. Durations of the different instars are 3 to 4 , 2 to 3, 2 to 3, 2 to 3 and 4 to 6 days respectively. The first instar caterpillars nibble and feed on the green matter on the undersurface at the base of the leaves and the later stage caterpillars web the leaves together and feed from inside skeletonising the leaves.Item Studies on the influence of host and induced superparasitism on the pupal parasite Trichospilus pupivora Ferriere (Eulophidae)(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1963) Jayarathnam, K; Joseph, K VThe literature on the effect of host on parasites and that on Trichospilus pupivora has been reviewed. The total number of adults produced, sex ratio, developmental period, longevity and size of T. pupivora were accertained when bred on eight different speciesof host pupae, namely (1) Phytometra peponis (2) Prodenia litura, (3)Orthaga exvinacea, (4) Sylepta derogata, (5) Lampides boeticus, (6) Margaronia indica, (7) Nephantis serinopa, and (8) Gracillaria soyella. Correlation and regression studies show that there exist, a highly significant and positive linear correlation between the weight of the host pupa on the one hand and the number of parasites emerged, the proportion of females , the developmental period and the size of the parasites emerged, the proportion of females, the developmental period and the size of the parasites on the other. There does not appear to be any correlation between longevity of parasites and weight of host pupa.Item Two caterpillars destructive to stored products in Kerala(1961) Ommen, C N; Joseph, K V