Browsing by Author "Padmakumari, G"

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Anthracnose of orchids incited by glomerella Cingulata (Stonem) Spauld and Schrenk
(Kerala Agricultural University, 1994) Sreedharan, A; Lulu Das; Padmakumari, G
Changes in the mineral contents of rice infected with Corticium sasakii (Shirai) matsumoto
(Kerala Agricultural University, 1981) Padmakumari, G; Menon, M R
Changes in the mineral contents of rice plants infected with Corticium sasakii (Shiral) Matsumoto were investigated. There was an accumulation of calcium and magnesium in plants inoculated with the pathogen, while potassium and phosphorus recorded a reduction after infection.
Changes in the nitrogen and sugar content of rice infected with Corticium Sasakii (Shirai) Matsumoto
(Kerala Agricultural University, 1980) Padmakumari, G; Menon, M R; Remadevi, l
Changes in the nitrogen and sugar content of rice plants after infection by Corticium sasakii (Shirai) Matsumoto were investigated. The infection by the fungus reduced the total nitrogen content. The amino nitrogen content increased significantly due to infection. The sugar content also showed significant reduction as compared to healthy plants.
Effect of management practices on the incidence and intensity of grey blight disease of coconut
(Department of Plant Pathology, College of Agriculture, Vellayani, 1997) Anupama, N; Padmakumari, G
From a detailed survey on the occurrence of leaf blight disease of coconut in Thiruvananthapuram (Coconut Research Station, Balaramapuram and Instructional Farm, Vellayani) and Alappuzha Districts (Rice Research Station, Kayarnkulam) it was revealed that Pestalotiopsis palmarum (Cooke) Stey was the major pathogen causing grey leaf blight of coconut in both the areas. Curvularia sp. were also found to be contribute to this disease. Of the various media tested, best growth of P. palmarum was seen in potato dextrose agar and broth. Among the various carbon sources tested dextrose, starch and inositol were equally effective for the growth of P. palmarum and for Curvularia sp., Sucrose, dextrose and starch were the best carbon sources. A temperature of 25°C and 35°C was found to be optimum for the growth of P. palmarum and Curvularia sp respectively. Arecanut, cinnamon, clove, guava, mango, nutmeg and sapota intercropped with coconut in the three locations were found to be host of the pathogen P. palmarum. In vitro evaluation of fungicides revealed that Bordeaux mixture (1000 ppm) and Bavistin (2000 ppm) were superior in inhibiting the growth of P. palmarum on the other hand Bordeaux mixture (1000 ppm) and Dithane M-45 (1000 ppm) effectively inhibited the growth of Curvularia sp. Monitoring of the disease intensity over a period of 12 months has shown that grey leaf blight intensity was high in palms planted at closer spacing and which received no fertilizers. The disease intensity was minimum in palms with wider spacing and with higher level of fertiliser (N2P2K2). In general higher level of fertilizers and wider spacing may be considered as a management practice for controlling the incidence and intensity of the grey blight diseases in coconut palm in South Kerala.
Effect of organic manure and inorganic fertilizers on the disease incidence in rice
(Kerala Agricultural University, 1993) Abraham Varughese; Padmakumari, G
Response of two high yielding varieties of rice to npk applications in an acid peat soil of Kerala
(Kerala Agricultural University, Vellanikara, 1969) Padmakumari, G; Nair, N C; Koshy, M M
Response of two high yielding varieties of rice to NPK applications in an acid peat soil of Kerala
(Kerala Agricultural University, Vellanikara, 1969) Padmakumari, G; Nair, N C; Koshy, M M
Studies of fungal diseases of forage grasses
(Department of Plant Pathology, College of Agriculture, Vellayani, 1989) Sasidharan, R K; Padmakumari, G
A study of different fungal diseases of various forage grasses cultivated in Kerala showed that H. gramineum, F. graminearum and C. trifoli are prominent pathogens. Best growth of H. gramineum and F. graminearum were in Czapek (Dox) agar, while Curvularia trifoli grew best in Richards medium. All the pathogens were favoured by a temperature of 250 C. All the graminaceous hosts studied were susceptible to H. gramineum and F. graminearum. However, Curvularia trifoli infected paddy, congosignal and para grass, among the graminaceous hosts. Susceptibility to non-graminaceous hosts indicated that none of the pathogen’s could infect eupatorium, clerodendron, Papaya and Jack. In vitro evaluation of fungicides revealed that Bordeaux mixture 1 per cent and 1.5 per cent were found to be superior in inhibiting the growth of H. gramineum, F. graminearum, and C. trifoli. A field trial carried out has shown that blight disease caused by H. gramineum in hybrid napier was least in treatment combination of Dithane M-45 0.3 per cent, with NPK @ 200:50:62.5 kg/ha. In general, higher dose of potash favoured disease management. A fungicidal trial carried out revealed that Dithane M-45 0.3 per cent and Bordeaux mixture 1 per cent were effective in controlling blight disease of hybrid napier.