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Item On the effect of application of some pesticides on grain setting in rice(Kerala Agricultural University, 1976) Visalakshi, A; Rema Devi, L; Nair, M R G KItem Effect of phorate on growth characteristics and nitrogen contents of cowpea plants(Kerala Agricultural University, 1980) Visalakshi, A; Nair, M R G KStudies were made on the effect of phorale applied as granule with seeds treated/untreeted with Rhizobium on growth characterstics and total nitrogen contents of cowpea. In rhizobium treated plants, plant height and root length were significantly increased due to phorate treatment while the other factors such as fresh and dry weights of plants and TNC were increased only at 2 kg ai/ha level. In cowpea plants not treated with Rhizobium the height of the plant and TNC were significantly increased in general by phorate application.Item Effect of phorate on rhizobial nodulation in cowpea(Kerala Agricultural University, 1981) Visalakshi, A; Nair, M R G K; Aiyer, R SStudies were made on the effect of phorate granules applied along withs seeds at the time of sowing on nodulation in cowpea treated with Rhizobium a compared to nodulation in untreated seeds. In Rhizobium treated plants, phorate caused suppression of nodule development and increase In nodular size, fresh weight and dry weight. In plants untreated with Rhizobium, phorate suppressed nodule formation in the roots and stimulated nodule size and fresh wieght.Item Optimum spray volume requirements for rice at different stages of growth(Kerala Agricultural University, 1984) Thomas Biju Mathew; Mohan Das, N; Visalakshi, AField experiments were conducted for two seasons in 1980-'81 at the College of Agriculture, Vellayani for assessing the optimum volumes of insecticide suspension required for treating rice crop at different growth stages of the crop using a pneumatic knapsack sprayer and mist blower. The results showed that the optimum volumesof 0.2",, carbaryl suspension required to give highest deposits on leaves were 200, 300, 500 and 500 I/ha in the case of a pneumatic knapsack sprayer and 90, 1 20, 1 80 and 1 80 I/ha in the case of a mist blower at 30, 45, 60 and 75 days after sowing respectively. The optimum volumes thus obtained were correlated with the leaf area indices of the respective stages of growth and relevant statistical models were fitted for both the type of sprayers.Item Persistence of residues of phorate in rice grain and straw when applied at different growth stages of the plant(Kerala Agricultural University, 1992) Naseema Beevi, S; Visalakshi, AStudies on the persistence of phorate in the rice grain and straw when applied at different intervals after planting in different soil types of Kerala showed that no detectable residues persist in grains or straw at harvest when the crop was treated at 20 days after planting. Detectable residues were present in grains and straw at the higher two doses of 1.25 and 1.50 kg ai/ha applied at 40 days after planting and at all the doses of 1.0, 1.25 and 1.50 kg ai/ha applied at 60 days after planting and these residues exceeded the tolerance limit also.Item Field evaluation of insecticides on the control of rice bug (Leptocorisaacuta thunb.) in epidemic outbreaks(Kerala Agricultural University, 1995) Krishnakumar, K; Visalakshi, ATwo field experiments were conducted to assess the efficacy of different insecticides for controlling Leplocorisa acula Thunb. at different population levels. In the first experiment, where there was more of a population stress, the insecticides malathion, methyl parathion and fenthion were found to he more effective in controlling the hug, the percentage reduction heing 75.72 to 97.15, 72.71 to 94.76 and 69.92 to 91.85 per cent respectively. In the second experiment with lesser population stress also, the same insecticides showed the maximum effect in control! ing Leplocorisa acula in the field. The effect of these insecticides was indicated by the higher grain/chaff ratio in all these treatments.Item Degradation of mancozeb residues in pepper and the effect of processing on the removal of residues(Kerala Agricultural University, 1997) Naseema Beevi, S; Thomas Biju Mathew; Visalakshi, A; Nalina Kumari, TItem Dissipation of endosulfan in cowpea(Kerala Agricultural University, 1997) Naseema Beevi, S; Thomas Biju Mathew; Visalakshi, AIn an experiment to study the dissipation of endosulfan in cowpea pods following application @ 0.07 and 0.14 per cent at flowering and paid formation stage, the residues dissipated below detectable level on 15th day in the lower dose while 0.3 mg kg'1 could be detected in the higher dose. A waiting period of 2.85 and 5.21 days are fixed for the lower and higher dose respectively. Washing of green pods removed 39.78% of the initial deposit while washing followed by cooking removed up to 67.93% in the lower dose.Item Control of major pests of copra with phosphine fumigation(Kerala Agricultural University, 1998) Nalinakuinari, T; Visalakshi, A; Mammen, K VItem Dissipation ok quinalphos and monocrotophos residues in cardamom Capsules(Kerala Agricultural University, 1998) Thomas Biju Mathew; Visalakshi, A; Naseema Beevi, S; Rajan Asari, P A; Rajagopal, BThe paper describes the results of a field experiment conducted in the Cardamom Research Station, Pampadumpara, to study the dissipation of two insecticides used for controlling cardamom thrips and to fix their waiting periods. The results showed that the residues of quinalphos reached below the tolerance limit of 0.25 ppm within 23 to 24 days in fresh cardamom and within 20 to 21 days in cured cardamom. The corresponding periods for monocrotophos did not differ between fresh and cured cardamom (22 to 23 days) because of the systemic nature of the residues.