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Theses

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1945 - 194911960 - 19658
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Subject: Entomology × Author: KAU × End date: 1966 ×
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Now showing 1 - 9 of 9
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    ThesisItemOpen 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 Nair
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    ThesisItemOpen 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 R
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    ThesisItemOpen 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 V
    Literature 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.
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    ThesisItemOpen Access
    Studies on the relative toxicity of some insecticides to adults of Dacus cucurbitae (Coquillett) when used in bait sprays
    (Division of Entomology, Agricultural College and Research Institute, Vellayani, 1965) Dale, D; KAU; Nair, M R G K
    The relative toxicity of six new synthetic insecticides namely DDT, BMC, parathion , malathion, dipterex and sevin to adults of D.cucurbitae was ascertained by exposing the files : (a) to snake gourd leaves sprayed with the bait fluid and : (b) to droplets applied on glass surface. The order of relative toxicity of the different insecticides was Parathion= Dipterex > Malathion > Sevin = BMC > DDT. Coarso spray droplets of the baits were found to be more effective in killing the files than the fine sprays. An explanation for this phenomenon is given. It is concluded that field conditions for practical control, coarser will be better than fine sprays of the liquid bait.
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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.
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    ThesisItemOpen Access
    Studies on the effect of host nutrition on the larval parasite, Microbracon brevicornis Wesmael (Braconidae: Hymenoptera)
    (Division of Entomology, Agricultural College and Research Institute, Vellayani, 1965) Susamma Mathai; KAU; Renga Ayyar, G
    Literature on effect of nutrition on fecundity, development and longevity of insects with special reference to entomophagous forms has been reviewed. Comparative studies of eleven different nutrient media were made to ascertain their effect on the development and growth of the larvae of Corcyra cephalonica (Stainton) using coarsely ground wheat flour as a medium of basic diet. The larval duration was considerably reduced,by 10-14 days when the larvae were reared in a medium of basic diet containing coarsely ground wheat flour to which either fructose , or a combination of black gram powder and glucose fortified with yeast were added. The pupal duration of Corcyra cephalonica was not much affected by various nutrient media , through addition of bengal gram powder to basic diet in the larval nutrition shortened the pupal period by two days.
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    ThesisItemOpen Access
    Studies on the susceptibility of the common caterpillar pests to infection by Bacillus thuringiensis Berliner
    (Division of Entomology, Agricultural College and Research Institute, Vellayani, 1964) Thomas, M J; KAU; Renga Ayyar, G
    Literature on Bacillus thurimgiensis Berlinerin relation to insect pest control has been reviewed. Susceptibility of twentysix diferent species of caterpillar pests, commonly occuring in Kerala, to infection by B. thuringiensis spores has been ascertained. Susceptibilityof seventeen of these caterpillars to the bacterium has been tested for the first time. In a screening experiment all the twentysix species of caterpillars have been infected by feeding them with food materials dipped in the spore suspension of B. thuringiensis containing 12.5 x 10 spores per 100 cc.
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    ThesisItemOpen Access
    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; KAU; Joseph, K V
    The 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.
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    ThesisItemOpen Access
    Studies on the insect pests of cardamom in Travancore
    (The University of Travancore, Trivandrum, 1945) Ronga, Aiyar, G; KAU