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ThesisItem Open Access Evaluation of the toxicity of O,O-diethyl-thiono phosphoric acid O (quinoxalyl (2) ester (sandoz insecticide-6538)to insect pests(Division of entomology ,Agricultural college and research institute ,Vellayani., 1970) Gopinathan Nair, P; KAU; Nair, M R G KThesisItem Open Access Control of nematode parasites of brinjal with insecticide and nematicide granules(Division of entomology ,Agricultural college and research institute ,Vellayani., 1970) Vergis, P C; KAU; Mohas Das, NThesisItem 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 Effect of organic amendments on plant parasitic nematodes and soil micro-organisms(Department of Entomology, College of Agriculture, Vellayani, 1992) Ajith, K; KAU; Sheela, M SField experiments conducted to evaluate the effect of neem and eupatorium leaves at two levels on plant parasitic and non-parasitic nematodes and soil micro-organisms in the rootzone of bhindi and cowpea in rainy and summer seasons revealed that neem and eupatorium leaf treatments (300g/plant or 15 t/ha) were found effective in controlling Helicotylenchus spp., R. reniformis and M. incognita in the rootzone. Lower dose (150g/plant) of neem was found sufficient to suppress the Helicotylenchus spp. In the rootzone of bhindi. Effect of these treatments persisted up to 75 D A S in rainy season and 45 DAS in summer season. The effect of lower doses also persisted up to 30 DAS. The predatory and saprophytic nematode population build up in the rootzone was enhanced by higher dose of eupatorium. The effect on predatory fauna persisted up to 75 D A S in the rootzone of two crops. But in cowpea the effect on saprophytic fauna persisted only up to 60 D A S. The microbial populations (bacteria, fungi and actinomycetes) were increased in the rootzone of bhindi and cowpea in two seasons by the application of eupatorium leaf at higher dose where as neem leaf (higher dose) reduced the microbial population. Only the fungal population increased by the application of neem leaf at higher dose during rainy season. There was seasonal variation in population build up of fungi and maximum effect was seen in rainy season. The biometric characters (number of leaves, height of plant, root weight and shoot weight) and yield of bhindi and cowpea increased significantly by the higher dose of neem and eupatorium leaf. For increasing the height, lower dose of neem, and, for yield lower dose of neem and eupatorium also were found effective. The population of nematodes in the roots at the termination of experiment was significantly reduced by the higher dose of neem and eupatorium in bhindi while lower dose was found effective protecting cowpea roots.ThesisItem Open Access Ecofriendly pest management in Brinjal (Solanum melongena L.)(Department of Entomology, College of Agriculture,Vellayani, 2000) Annie Bernice, T S; KAU; Krishnakumar, RA survey was conducted in the important brinjal growing tracts of Thiruvananthapuram district to study the population dynamics of the pests and their natural enemies in the brinjal ecosystem. Laboratory experiment and field experiments were conducted in the College of Agriculture, Vellayani to assess the deterrency and toxicity of the different treatments on aphids, epilachna and Leucinodes which were identified as important pests of brinjal from the survey and the effective treatments as identified from the laboratory experiment were carried out in the field. =<; Malathion alone or with garlic was found to be toxic to aphids. Epilachna and Leucinodes. The treatments with neem oil and Hyptis suaveolens either alone and in combination were found to have deterrent and toxic effects on aphids, Epilachna and Leucinodes in the laboratory experiment. However, the effect was much pronounced when neem oil activated with garlic was used in combination with Hyptis suaveolens. In the field, though malathion was found to contain the pests, the effect was not persistent for a long time and hence was not effective in the long run. The combination of neem oil + garlic plus Hyptis suaveolens was found to offer protection for the pest for a long period of time. On par with it were combination of nee m oil plus Hyptis suaveolens + garlic and combination of neem oil + H. suaveolens. The botanicals were also found to be safe for the natural enemies like coccinellids, staphylinids and spiders. This treatment was also found superior to other treatments in terms of net income and benefit cost ratio and the lower unit cost of the treatment with high yield was precisely the reason for its superiority.
