Browsing by Author "Sarma, Y.R."

Now showing 1 - 20 of 36
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    Association of dipteran maggots in rhizome rot of ginger
    (2007-02-08) Prem Kumar, T.; Sarma, Y.R.; Gautam, S.S.S.
    A constant association of two dipteran maggots, Eumerus sp. and Mimegralla sp. was noticed with Pythium infected rhizomes and occasionally with the bacterial wilt (Pseudomonas solanacearum) affected rhizomes also. Positive Pythium isolations were obtained in 1.02% of maggots of Mimegralla sp. collected from the field. From infected rhizomes, 42% showed Pythium alone and 58% showed Pythium and maggots and never maggots alone. Both the species were capable of subterranean movement. A crude ginger extract had an attractant effect on the maggots.
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    Bacterial wilt of ginger (Zingiber officinale Rosc)
    (2007-02-08) Sarma, Y.R.; Indrasenan, G.; Rohini Iyer, R.
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    Basal wilt of black pepper and its control
    (2007-02-08) Brahma, R.N.; Nambiar, K.K.N.; Sarma, Y.R.
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    Basal Wilt of Black Pepper and its Control
    (1980-12) Brahma, R.N.; Nambiar, K.K.N.; Sarma, Y.R.
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    Brown Rot of Turmeric
    (1974) Sarma, Y.R.; Nambiar, K.K.N.; Radhakrishnan Nair, C.P.
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    Capsule rot of cardamom: Pythium vexans de Bary as a causal agent
    (2007-02-08) Nambiar, K.K.N.; Sarma, Y.R.
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    Chemical control of capsule rot of cardamom
    (2007-02-08) Nambiar, K.K.N.; Sarma, Y.R.
    Capsule rot of cardamom prevalent in the High Ranges of Kerala is a serious disease responsible for heavy losses in yield. Chemical control trials carried out in plantations using different fungicides showed that Bordeaux mixture 1% or copper oxychlorides 0-2% with a wetting agent when sprayed twice in June and August was effective in controlling the malady.
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    Chemical control of capsule rot of cardamom
    (1974) Nambiar, K.K.N.; Sarma, Y.R.
    Capsule rot of cardamom prevalent in the High Ranges of Kerala is a serious disease responsible for heavy losses in yield. Chemical control trials carried out in plantations using different fungicides showed that Bordeaux mixture 1% or copper oxychlorides 0-2% with a wetting agent when sprayed twice in June and August was effective in controlling the malady.
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    Cylindrocladium leaf rot of clove
    (2007-02-08) Sarma, Y.R.; Nambiar, K.K.N.
    Cylindrocladium quinquiseptatum causes a leaf rot and leaf spot disease of clove. The disease was observed for the first time in India on leaves of seedlings as well as mature trees, and was very severe on the seedlings. The fungal isolate was pathogenic to other myrtaceaeous hosts, namely, Eugenia jambolana, Pimenta dioica, Eucalyptus grandis, JC. maculata, and E. globulus.
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    Dry rot of ginger caused by macrophomina phaseolina(Tassi) goid.
    (1974-08) Sarma, Y.R.; Nambiar, K.K.N.
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    Effect of climatic factors on Phytophthora leaf infection in black pepper grown in arecanut-black pepper mixed cropping system
    (2007-02-08) Ramachandran, N.; Sarma, Y.R.; Anandaraj, M.; Jose Abraham
    Effect of climatic factors on the occurrence of foliar infection in black pepper caused by Phytophthora palmivora MF4 was studied during the years 1984-86 in arecanut-black pepper mixed cropping system. The correlation studies between the disease recorded at weekly intervals and the meteorological factors prevailing during the preceding seven days showed a positive correlation between the rainfall, number of rainy days and relative humidity whereas temperature and sunshine hours had a negative correlation. Average climatic factors worked out during increasing and decreasing phases of the disease showed that factors such as low temperature (22.7-29.6°C), shorter duration of sunshine (2.8-3.5 h/day) high rainfall (15.8-23.Omm/day) and high relative humidity (81-99%) contributed to the increase n disease.
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    Effect of two systemic fungicides, aliette and ridomil on Phytophthora palmivora isolate of Piper nigrum
    (2007-02-08) Ramachandran, N.; Sarma, Y.R.; Nambiar, K.K.N.
    The sensitivity of two systemic fungicides, Ridomil and Aliette to Phytophthora palmivora was tested by poison bait technique. Ridomil at 100 and 200 ppm showed 80% and 86% inhibition respectively, in the radial growth of the fungus and complete inhibition at 300 ppm. Aliette showed 22 % and 50 % inhibition of the fungus at 509 and 1000 ppm respectively and growth was absent at 1500 ppm. The systemic activity of the fungicides was evaluated by measuring the lesion diameter on the% inoculated leaves of black pepper pretreated with fungicides. Ridomil-treated leaves showed no lesion at 500 and 1000 ppm whereas Aliette-treated leaves showed inhibition of the lesion development to the extent of 57% and 71% at 500 and 1000 ppm respectively.
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    Estimates on the extent of loss due to quick wilt disease of black pepper (Piper nigrum L.) in Calicut district of Kerala
    (2007-02) Balakrishnan, R.; Anandaraj, M.; Nambiar, K.K.N.; Sarma, Y.R.; Brahma, R.N.; George, M.V.
    A survey was conducted in Calicut district of Kerala State (India) to assess the extent of loss in yield due to quick wilt disease of black pepper. The study was conducted for a period of three years (1982-1984) and it was estimated that on an average about 1,88,900 vines perish due to quick wilt disease per year and the consequent yield loss amounting to about 119 metric tonnes of black pepper per year. It was also estimated that a total of 11 % of plants were lost due to the disease during the course of three years (1982-1984)
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    Factors associated with slow wilt of pepper
    (2007-02) Nambiar, K.K.N.; Sarma, Y.R.
    Slow wilt is one of the serious diseases of pepper, next only to quick wilt. The etiology of the disease is little understood. Investigations show that the disease is of complex origin and many agents/factors are associated with the disease. Results are presented to show that fungi, nematodes, nutritional deficiency and soil moisture stress are associated with the disease.
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    Field Reaction of Turmeric Types to Leaf Blotch Disease
    (2007) Nambiar, K.K.N.; Sarma, Y.R.; Brahma, R.N.
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    Field reaction of turmeric types to leaf blotch disease
    (2007-02) Nambiar, K.K.N.; Sarma, Y.R.; Brahma, R.N.
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    Foliar Yellowing and Root Rot in Coconut Seedlings Caused by Phytophthora Sp.
    (1993) Sarma, Y.R.; Nambiar, K.K.N.; Anandaraj, M.
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    Inflorescence Blight of Cashew (Anacardium Occidentale L.)
    (1973) Nambiar, K.K.N.; Sarma, Y.R.; Pillai, G.B.
    The role of tea mosquito, Helopeltis antonii Sign. (Miridae: Heteroptera) and the fungi (Gloeo-sporium mangiferae P. Henn., and another nons porulating fungus) in inciting inflorescence blight in cashew, Anacardium occidental L., was studied. It was found that tea mosquito is the primary causal agent of the malady and the fungi are only secondary saprophytic colonizers.
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    Inflorescence Blight of Cashew (Anacardium Occidentale L.)
    (2007-02) Nambiar, K.K.N.; Pillai, G.B.; Sarma, Y.R.
    The role of tea mosquito, Helopeltis antonii Sign. (Miridae: Heteroptera) and the fungi (Gloeo-sporium mangiferae P. Henn., and another nonsporulating fungus) in inciting inflorescence blight in cashew, Anacardium occidentale L., was studied. It was found that tea mosquito is the primary causal agent of the malady and the fungi are only secondary saprophytic colonizers.