Browsing by Author "Rajan, K M"
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Item Adaptability and acceptability components of the rice cultivar kunjukunju(Kerala Agricultural University, 1995) Elsy, C R; Sukumara Dev, V P; Rosamma, C A; Rajan, K M; Nadarajan, LItem Aryan muthal aiswarya vare /ആര്യൻ മുതൽ ഐശ്വര്യ വരെ(Kerala Agricultural University, 1993-07) Rosamma, C A; Elsy, C R; Rajan, K MItem Control of stackburn disease of rice(Kerala Agricultural University, 1979) Rajan, K M; Varadarajan Nair, PItem Effect of mechanical composition of soil on population of Pythium aphanidermatum in soil(Kerala Agricultural University, 1973) Rajan, K M; Singh, R SItem Effect of oil-cakes and moisture on seed emergence and post-emergence damping off of tomato(Kerala Agricultural University, 1974) Rajan, K M; Singh, R SItem Effect of organic soil amendments on plant growth and intensity of sheath blight of rice(Kerala Agricultural University, 1975) Rajan, K M; Ramanatha Menon, MItem Field evaluation of certain proprietory fungicides against sheath blight of paddy(Kerala Agricultural University, 1979) Rajan, K M; Sukumaran Nair, S; Varadarajan Nair, PItem Growth of Pythium aphanidermatum in oil-cake amended medium(Kerala Agricultural University, 1973) Rajan, K M; Singh, R SItem Influence of a plant growth promoter in transplanted lowland rice(Kerala Agricultural University, 1995) Jose Mathew; Rajan, K MItem Integrated management of sheath blight disease of rice(Department of Plant Pathology, College of Agriculture, Vellayani, 1990) Geogy Zacharia; Rajan, K MThe present investigation was undertaken to evolve an economically feasible management strategy integrating biological and chemical aspects of control measures of sheath blight disease of rice. An attempt has been made to identify a potential biocontrol agent to combat sheath blight disease causing considerable loss to rice cultivation. Another important aspect of the programme was to develop and easy and cheap method of assaying the population of R. solani in paddy soil. Among different techniques screened, floatation sieving using both Fenwick can and glass cylinder were effective in selective recovery and the latter was further modified using different concentrations of salt. Among selective media mineral antibiotic media amended with Fosetyl-al and in studies using different baits autoclaved straw bits were superior. Among the microorganisms isolated from rice soils of Thiruvananthapuram, Kerala, thirteen species of fungi were found to be antagonistic to R. solani. Among the antagonists, Trichoderma harzianum was found to be the best biocontrol agent against sheath blight disease. This was followed by T. koningii. A field study incorporating various soil amendments viz., neem cake and lime, Carbendazim and T. harzianum, a combination of amendments with Carbendzim and T. harzianum reduced disease severity and increased yield of grain and straw. These combinations also showed higher fungal and bacterial population and reduced R. solani population. Negative correlation between total fungi/bacteria and R. solani was observed suggesting inoculums reduction of the pathogen in critical growth stages of the crop. From the economic point of view, lime alone was found to have highest cost- benefit ratio compared to other treatments. The above result is possibly due to poor disease pressure observed during the investigation.Item Management of sheath blight disease of rice in relation to the population of the pathogen in soil(Department of Plant Pathology, College of Horticulture, Vellanikkara, 1987) Shaji Alexander; Rajan, K MLaboratory, pot and field experiments were carried out to study the role of various physical, chemical and biological factors on the management of sheath blight disease of rice caused by Rhizoctonia solani Kuhn. (Thanatephorus Cucumerlis (Frank) Donk). Populations of total fungi, bacteria and actinomycetes in soil were enumerated at different stages of growth of the crop in order to assess their role in reducing the intensity and incidence of sheath blight disease. Results of the investigation revealed that the pathogen can be managed by deeper ploughing followed by submergence of the soil for a minimum period of two months. Amendments like glyricidia leaves, rice husk, lime and non edible oil cakes of marotti, neem and punna were useful in reducing the severity and spread of the disease. Fungicides like carbendazim and ediphenphos and the herbicide benthiocarb were also efficient in managing the disease. Rotation of rice with crops like tapioca, banana and brinjal was also useful. It was seen that amendments stimulated the population of saprophytes like Trichoderma viride in soil which are antagonistic to R. solani resulting in a subsequent reduction in population of the pathogen. In spite of the reduction in severity and spread of the disease, grain and straw yields were not enhanced by the treatments. More elaborate field trials are to be undertaken before landing on any ultimate conclusion regarding the use of these practices as tools for disease management.Item New leaf blight of pineapple(Kerala Agricultural University, 1993) Suharban, M; Rajan, K MItem Phomopsis blght of tapioca (Manihot esculenta crantz)(Kerala Agricultural University, 1973) Rajan, K M; Ramanatha menon, M; Susamma PhilipItem Reaction of certain rice varieties to sheath Blight and sheath rot diseases(Kerala Agricultural University, 1979) Rajan, K M; Varadarajan Nair, PItem Studies on the control of bacterial wilt of tomato with reference to organic soil amendments and chemicals(Department of Plant Pathology, College of Agriculture, Vellayani, 1977) Jayaprakash, M G; Rajan, K MThe pot culture and field experiments were conducted to assess the effort of organic soil amendments and chemicals on the incidence of bacterial wilt of tomato. The population dynamics in relation to the causal organism, total fungi, bacteria and actinomycetes were also studied. Theresult of the investigation revealed that organic materials did not chook the disease incidence to a satisfactory level . However , the application of organic material followed by the treatment with chlorotomycin and streptocycline gave a satisfactory control of the disease.