2. Institutional Publications
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Item Effect of granular insecticides on nodulation, rhizosphere microflora and growth characteristics of cowpea(Kerala Agricultural University, 1978) Visalakshy, A; Santhakumari, K; George Koshy; Nair, M R G KStudies conducted to assess the effect of ten insecticide granules on nodulation, rhizosphere microflora and growth characteristics of cowpea showed that carbofuran, carbaryl and quinalphos increased the nodules significantly. An increase in size of nodules was also observed by all the insecticides except quinalphos. Carbofuran, carbaryl and chlorodimeiorm increased the plant height. Weight of roots was enhanced by carbofuran and MIPC. The fungal and bacterial population is influenced variously by the different insecticides both in the rhizosphere and non-rhizosphere soil, whereas the actinomycetes population was not affected.Item Effect of weathering on persistence of insecticide residues on glass surfaces(Kerala Agricultural University, 1981) George Koshy; Das, N M; Nair, M R G KItem Yellow oleander (Thevetia neriifolia juss.) a bio-antifeedant for epilachna beetle (Henosepilachna vigintioctopunctata L.)(Kerala Agricultural University, 1999) Hebsy Bai; George KoshyFresh and dried leaves and seeds of Thevetia neriifolia Juss. were evaluated for their antifeedant activity against Henosepilachna vigintioctopunctata L. using acetone, benzene, ethanol, hexane, methanol and water as extractants. Based on the percentage of leaf protection, seed extracts were found superior to the leaf extracts. Fresh and dried leaf extracts were on par. Among the solvents, ethanol and methanol gave maximum leaf protection closely followed by water. Based on larval starvation, seed extracts were superior to leaf extracts and fresh leaf extracts were significantly better than dried leaf extracts. Soaking of oowdered plant material in solvents for 48 h and filtration was found as effective as soxhlet method for extracting antifeedant components from leaves and seeds of T. neriifolia.Item Deterioration of insecticides on glass and on leaf surface(Kerala Agricultural University, 1972) George Koshy; Das, N M; Nair, M R G K