Browsing by Author "Abraham Jacob"
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Item Biology of Euchromia polymena (Amatidae: Lepidoptera) a pest of sweet potato(Kerala Agricultural University, 1973) Thomas, M J; Abraham JacobItem Changes in haemocyte counts in larvae of Spodoptera Mauritia (Boisduval) infected with a nuclear polyhedrosis virus(Kerala Agricultural University, 1974) Lathika, P; Abraham JacobItem Comparative susceptibility of nymphs and adults of Nilaparvata lugens stal to Fusarium Oxysporum Schlect and its use in microbial control(Kerala Agricultural University, 1979) Suma Kuruvilla; Abraham JacobItem Effect of a nuclear polyhedrosis on some mineral contents of Spodoptera Litura F.(Kerala Agricultural University, 1974) Abraham Jacob; Subramaniam, T RThe change in the levels of calcium, magnesium, sodium and potassium in the larvae of Spodoptera litura during the course of a nuclear polyhedrosis were studied. Calcium and potassium contents decreased in the diseased larvae especially towards the later stages of infection while the levels of magnesium and sodium were not affected.Item Effect of larval age and dosage of virus on the susceptibility of Spodoptera litura F. To a nuclear polyhedrosis(Kerala Agricultural University, 1972) Abraham Jacob; Subramaniam, T RItem Effect of some pesticides on the growth and sporulation of Fusarium Oxylporum Schlect palhogenic to brown plant hopper Nilaparvata Lugens Stal(Kerala Agricultural University, 1981) Suma Kuruvilla; Abraham JacobItem Fusarium Moniliforme var Subglutinans Wollenw. & Reink., pathogenic to the spotted beetle Epilachna Vigintioctopunctata F(Kerala Agricultural University, 1978) Abraham Jacob; Suma Kuruvilla; Babu P Philip; Rajan Asari, P AItem Histopathology of a granulosis virus of Pericallia Ricini F. (Arctiidae:Lepidoptera)(Kerala Agricultural University, 1980) Babu M Philip; Abraham JacobHistopathology of a granuiosis of the larvae of Pericallia ricini F,, is described. Adipose tissues were the major sites of virus infection. Moderate infection was observed in hypodermis and tracheal matrix cells Capsules were first observed in many fat body cells and in a few cells of the trachea! matrix and hypodermis in 96 hours after infection. By 192 hours after treatment, infection had spread to the entire adipose tissues.Item Histopathology of tobacco caterpillar Spodoptera litura F. infected with a nuclear polyhedrosis virus(Kerala Agricultural University, 1973) Abraham Jacob; Subramaniam, T RItem Influence of nuclear polyhedrosis on moulting in the larvae of Pericallia Ricini F.(Kerala Agricultural University, 1980) Vasudevan Nair, K P; Abraham JacobItem Investigations on a nuclear polyhedrosis of Spodoptera mauritia (Boisduval) (Noctuidae, Lepidoptera)(Kerala Agricultural University, 1974) Lathika, P; Abraham JacobItem Investigations on nuclear polyhedrosis of black hairy caterpillar, Pericallia Ricini fabricius (Arctiidae: Lepidoptera)(Division of Entomology, College of Agriculture, Vellayani, 1975) Vasudevan Nair, K P; Abraham JacobDetailed investigations were carried out on the nuclear polyhedrosis of the black hairy caterpillar,Pericallia ricini (Arotiidae) covering symptomatology, larval susceptibility, effect of the virus on the larval moulting, changes in the number of circulating haemocytes in the infected larvae, nature of causative agent, effect of temperature and sunlight on the infectivity of the virus and the cross infectivity of the virus to other species of lepidoptera. The virus infected larvae exhibited a ll the typical symptoms of nuclear polyhedrosis infection as reported from other lepidopterous larvae. The larvae infected in the early instars appeared paler and thinner. The infected larvae showed loss of appetite and became sluggish. The dead or dying larvae showed the characteristic symptom of hanging head downwards from the top o f the containers with the aid of prolegs. In the advanced stages of infection the cuticle became fragile and it ruptured liberating the liquefied body contents. The susceptibility of the larvae to virus infection decreased with increase in the age of the larvae. The averageincubation period varied from 5*24 days for the second instar to 8 days for the sixth instar larvae. The virus infection inhibited moulting in the later stages of the disease. No significant difference was observed in the THC of healthy larvae and virus infected larvae up to 24 hours after inoculation; there was significant reduction in the THC of diseased larvae after 24 hours of inoculation.Item Mass culturing of Fusarium Oxysporum Schlect, an entomogeous fungus of brown plant hopper Nilaparvata Lugens stal(Kerala Agricultural University, 1981) Suma Kuruvilla; Abraham JacobStudies were conducted to evolve suitable techniques of mass culture of Fusarium oxysporum Schlect infecting the rice brown plant hopper. The results showed that green gram, wheat or sorghum could be used as substrates for eosy mass production of the fungus as they produced maximum spores with high virulence. Further, for better growth and sporulaticn, a combination of 30 g of material +25 ml of water was found to be the optimum.Item Morphological and ecological studies on the lady bird beetle, Cheilotnenes sexmaculata Fabr. ( coccinellidae-coleoptera)(Faculty of entomology, Regional post-graduate training centre, Agricultural college and research institute Coimbatore, 1963) Abraham JacobItem Nature of inclusion bodies of a nuclear polyhedrosis virus of Diacrisia obliqua (Walker)(Kerala Agricultural University, 1974) Abraham Jacob; Thomas, M JItem New disease of the Indian honey bee, Apis Cerana Indica F., in Kerala(Kerala Agricultural University, 1992) Abraham Jacob; Rajan Asari, P A; Mohandas, NItem Nuclear-polyhedrosis virus of Diacrisia obliqua (Wlk) (Arctiidae, Lepidoptera)(Kerala Agricultural University, 1972) Abraham Jacob; Thomas, M JItem Pathogenesity of thai sacbrood virus to the ecotypes of Apis cerana indica Fab. in Kerala(Department of Agricultural Entomology, College of Agriculture, Vellayani, 1998) Devanesan, S; Abraham JacobItem Relative toxicity of the nuclear polyhedrosis virus of Spodoptera mauritia (Biosduval) to different larval instars of the host(Kerala Agricultural University, 1987) Vasudevan Nair, K P; Abraham JacobBioassay of the NPV of Spodoptera mauritia (Biosduval) showed that LC50 increased with larval age. The LC50 ranged from 3558 PIBS/ml for the second instar to 808700/ml for sixth instar. An inverse relationship between LTSO and concentration of the virus was observed.Item Studies on Fusarium Oxysporum Schlect infecting rice brown plant hopper Nilaparvata Lugens Stal(Kerala Agricultural University, 1980) Suma Kuruvilla; Abraham JacobGrowth and sporulation of Fusarium oxysporum Schlect, an entomogenous fungus of the rice plant hopper Nilaparvata lugens Stal were superior in oat meal agar closely followed by potato dextrose agar. Czapeck's and Richards' agar media were lesssuitable. In all these media, only microconidia were produced. Maximum number of spores were produced on the fifth day, after which the spore production decreased. Virulence was highest in spores of four and five-day-old cultures and spores of cultures more than five day old showed decreasing virulence.