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Theses

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1965 - 19672
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Subject: Entomology × Author: KAU × Author: Varghese, K C ×
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    ThesisItemOpen 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 K
    A 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.
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    ThesisItemOpen Access
    Studies on the effect of pre-storage insecticidal treatments on insect infestations in stored paddy
    (Division of Entomology, Agricultural College and Research Institute, Vellayani, 1965) Varghese, K C; KAU; Nair, M R G K
    An experiment was conducted under godown conditions to find out the effect of pre-storage treatment of paddy grains (PTB 10) with three doses each of malathion, pyrethrin and lindane in controlling insect infestations in stored paddy. The different doses of the three insecticides used were malathion 8, 16 and 24 ppm., pyrethrins 1, 2 and 4 ppm., and lindane 4, 8 and 12 ppm. The grains were sprayed with the insecticide emulsions, dried and exposed to infestation in an infested godown. Effect of treating the bags with the insecticides in preventing insect infestations in paddy stored within the bags, was also ascertained in paddy stored within the bags, was also ascertained by spraying the bag with each of these insecticides so as to give deposits of 7.8 mg. of lindane and malathion and 0.28 mg. of pyrethrin per 1120 sq.cm. of bag surface.