Browsing by Author "Radhakrishnan Nair, R."
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Item Aspergillus flavus Link., A Fungal Parasite on the Leaf-Eating Caterpillar, Lymantria obfuscata Walk.(1974-09) Radhakrishnan Nair, R.; Prem Kumar, T.Item Carbohydrate metabolism in arecanut (Areca catechu L.) leaves affected by yellow leaf disease(2007-02-08) Yadava, R.B.R.; Radhakrishnan Nair, R.; Mathai, C.K.The reducing, non-reducing, tota! sugars and starchcontents of yellow leaf desease affected and healthy tissues of arecanut {Areca catechu L.) were analysed at bimonthly intervals for a year The carbohydrate content in infected leaves remain higher than in healthy tissues. The trend or shift ip the metabolic activities by increasing accumulation of sugars in the disease-affected palms are discussed in the light of sink capacity and carbohydrate distribution.Item Charcoal pod rot of cacao(2007-02-08) Nambiar, K.K.N.; Radhakrishnan Nair, R.Item Charcol pod rot of cacao(1972-12) Nambiar, K.K.N.; Radhakrishnan Nair, R.Item Colletotrichum gloeosporioides causing inflorescence dieback, button shedding and nut rot of betel nut palm(2007-02-08) Saraswathy, N.; Koti Reddy, M.; Radhakrishnan Nair, R.Item Diseases(1982-12) Rawther, T.S.S.; Radhakrishnan Nair, R.; Saraswathy, N.Item Diseases and disorders(1992-05) Kochu Babu, M.; Radhakrishnan Nair, R.Item Effect of the pollinating weevil, Elaeidobius kamerunicus on the incidence of bunch failure in oil palm plantations of Little Andamans(2007-02-08) Chander Rao, S.; Kochu Babu, M.; Radhakrishnan Nair, R.Item Evaluation of certain fungicides against the die-back disease of areca inflorescence(2007-02) Saraswathy, N.; Koti Reddy, M.; Radhakrishnan Nair, R.Button shedding preceded by die-back of inflorescence is a severe problem in the areca plantations. Out of 13 fungicides tested in vitro, benomyl (0-1%), captan (0-25%), thiram (0-25%), and a phenyl mercury urea formulation (0 -1%) were highly fungicidal to the mycelial growth of Colleto-trichum gloeosporioides, the casual agent of the disease. Field trials carried out with -even fungicides showed that DMOC (0-1%), heptaene antibiotic (50ppm) + CuSO4 (50ppm), and Zineb (0-4%) in that order, were effective in controlling the malady.Item Fungal infection of processed arecanuts(1971) Nambiar, K.K.N.; Edison, S.; Radhakrishnan Nair, R.Arecanuts (Areca catechu L.) are damaged by fungi during the course of processing on the drying yard or later in storage rendering the nuts unsuitable for chewing. The damage due to fungal infection in processed nuts was beyond 60 per cent. There was no incipient fungal infection at any stage of development of the nut. On the other hand the nuts contracted fungal infection from the soil at the time of harvesting and also from the drying yard, The majority of infection took place during the initial days of sun-drying.Item Fungal infection of processed arecanuts(2007-02) Nambiar, K.K.N.; Edison, S.; Radhakrishnan Nair, R.Arecanuts (Areca catechu L.) are damaged by fungi during the course of processing on the drying yard or later in storage rendering the nuts unsuitable for chewing. The damage due to fungal infection in processed nuts was beyond 60 per cent. There was no incipient fungal infection at any stage of development of the nut. On the other hand the nuts contracted fungal infection from the soil at the.time of karvest ing and also from the drying yard. Tha tnijaricy of infec&ioa tooi placa during the initial days of san drying. The percentage of infection differed in different months, maximum being in October-November and minimum in February-March. The extent of damage was dependent upon factors like temperature, humidity and rainfall. Maximum percentage of infection was caused by Botryodipledia theobromae followed by Aspergillus sp. Fungal infection could be reduced "by eliminating soil contact with the nuts at the time of harvest and also by drying in a mechanical drier, possibility of reducing fungal infection in nuts by drying on cement floor etc. where drying will be quicker is indicated. Storing nuts in jute bags lined with polythene Was found to be better than jute bags alone in reducing fungal infection in storage.Item Investigations on Ganoderma Lucidum (Leys.) Karst Causing Anabe Disease of Arecanut(1973) Nambiar, K.K.N.; Radhakrishnan Nair, R.The factors influencing the growth of the fungus, Ganodermalucidum were studied in vitro. It was able to grow in a wide range of pH, from 2·0 to 9· 0, the maximum growth was at pH 5·5. Among the various nltrogen sources, studied, peptone supported the best growth. The fungus utilizes organic nitrogen only. Exccellent growth was obtained when maltose was the carbon source. In general the disaccharides supported good growth of the fungus. Formation of elongated , sporophores was noticed in saw-dust-malt medium or saw-dust , supplemented with waksmans medium. Mercuric chloride, captan , difolatan and vitavax were lethal to the fungus.Item Investigations on Ganoderma Lucidum (Leys.) Karst Causing Anabe Disease of Arecanut(1973) Nambiar, K.K.N.; Radhakrishnan Nair, R.The factors influencing the growth of the fungus, Ganoderma lucidum were studied in vitro. It was able to grow in a wide range of pH, from 2- 0 to 9- 0, the maximum growth was at pH 5-5. Among the various nitrogen sources studied, peptone supported the best growth. The fungus utilizes organic nitrogen only. Excellent growth was obtained when maltose was the carbon source. In general, the disaccharides supported good growth of the fungus. Formation of elongated sporophores was noticed in saw-dust-malt medium or saw-dust supplemented with Waksruans nicdium, Mercuric chloride, captan, difolatan and vitavax were lethal to the fungus.Item Marasmius bunch rot in an oil-palm plantation in the Andaman and Nicobar Islands(1987) Reddy, O.R.; Radhakrishnan Nair, R.; Majumdar, A.Item Spoilage Of Processed Arecanuts(1970) Nambiar, K.K.N.; Radhakrishnan Nair, R.