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ThesisItem Open Access Studies on the parasitic nematodes associated with vegetables in kerala(Division of entomology ,Agricultural college and research institute ,Vellayani., 1968) Ramakrishnan Nair, N; KAU; Mohan Das, NThesisItem Open Access Studies on the rice swarming caterpillar , Spodoptera mauritia boisduval in Kerala(Division of entomology ,Agricultural college and research institute ,Vellayani., 1967) Thomas, B; KAU; M R G K NairThesisItem Open Access Studies on the effect of plant nutrient on insect infestation on Abelmoschus esculentus monech(Division of entomology ,Agricultural college and research institute ,Vellayani.Trivandrum, 1967) Viswanath, B N; KAU; M R G K NairThesisItem Open Access Studies on the toxtcity of insecticide to residues on brinjal to Epilachna vigintioctopunctata fabricius(Division of entomology, Agricultural college and research institute, Vellayani, Trivandrum., 1965) Kunjamma Mathew, P; KAU; M R G K NairThesisItem Open Access Studies on the effect of refrigeration on the deveolopment of Trichospilus pupivora ferriere (Eulophidae)(Division of entomology ,Agricultural college and research institute ,Vellayani., 1964) Narayanan, N J; KAU; Gopalakrishnan Nair, M RThesisItem Open Access 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; KAU; 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.ThesisItem Open Access Studies on the population of soil nematodes in relation to certain chemical and biotic factors of soil(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1969) Ravindran Nair, K K; KAU; Mohan Das, NA total of 40 soil samples were collected and analysed to study the variations in the population of plant parasitic and non parasitic soil nematodes with reference to the chemical and biotic environments existing in soil. The total population of soil nematodes and the population of non-parasitic forms show a positive correlation with the pH of the soil within a range of 4.5-7.4. The parasite population is not correlated with the pH of the soil. There exists no correlation between the soil nematode population on the one hand and organic matter content , total soluble salts, and fungus and bacterial population of the soil on the other.ThesisItem Open Access Studies on the effect of sublethal doses of insecticides on Tribolium castaneum Herbst(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1968) Madhavan, O T; KAU; Nair, M R G KThe effect of sublethal doses of DDT, endrin, sevin, thiodan and parathion on the larval duration growth and survival, pupal duration and survival, adult fecundity and sex ratio and viability of the eggs, of Tribolium castanaum has been ascertained by rearing it in wheat flour media containing 4 to 5 graded sublethal concentrations of each insecticide. The developmental period of the larvae of T. castansum is prolonged as a result of the pressure of sublethal doses of the insecticides contained in the medium this prolongation is directly proportional to the increase in the concentration of the toxicant within the sublethal range and it is more pronounced in the case of DDT, endrin sevin and parathion, than thiodan.ThesisItem Open Access Studies on the nematodes associated with banana in Kerala(Division of Entomology, Agricultural College and Research Institute, Vellayani, 1967) Varghese, K C; KAU; Nair, M R G KA total of 120 samples of soil and 120 samples of roots of banana were collected from 15 localities between Vellayani in the south and Trichur in the north and their nematode fauna extracted and examined to asertain:- a) The genera of parasitic nematodes associated with banana and their distribution. b) Population of the nematodes (parasitic and non- parasitic) in the roots and soil of banana in relation to whether the plant is healthy or diseased, the type of soil and rainy or rain less seasons. The population of both parasitic and non-parasitic forms present in the soil is high during rainy season than during rainless season , irrespective of the soil type and whether the plant is diseased or healthy. The soil population of parasitic forms is high in association with diseased plants in both the seasons and in all the five soil tracts surveyed. The population of non-parasitic fauna in the soil does not show much variation with respect to the condition of the plant.
