Browsing by Author "Shanta, P."
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Item Addition to the Record of Host Plants of Stephonitis typicus Distant(1972) Mathen, K.; Shanta, P.; Chandy KurianItem Additional evidence of soil transmission of coconut root (wilt) pathogen(2007-02-08) Shanta, P.; Gopinathan Pillay, N.; Lal, S.B.A sap-transmissible pathogen resembling a virus is associated with the root (wilt) disease of coconut. This pathogen is soil borne. Cowpea plants became diseased when grown in infective soil, or in sterilized soil watered with infective leaf or root sap, or in soil to which infected roots were added. Treatment with pcntachloronitrobenzene destroyed infectivity. Air-drying for more than a week or fine grinding do not destroy infectivity. The pathogen perhaps is released through roots of infected plants. Soil water plays a major part in spread of the disease in nature.Item Additional evidence of soil transmission of coconut root (wilt) pathogen(1972-07) Shanta, P.; Gopinathan Pillay, N.; Lal, S.B.A sap-transmissible pathogen resembling a virus is associated with the root (wilt) disease of coconut. This pathogen is soil borne. Cowpea plants became diseased when grown in infective soil, or in sterilized soil watered with infective leaf or root sap, or in soil to which infected roots were added. Treatment with pcntachloronitrobenzene destroyed infectivity. Air-drying for more than a week or fine grinding do not destroy infectivity. The pathogen perhaps is released through roots of infected plants. Soil water plays a major part in spread of the disease in natureItem Aetiology of the wilt (root) disease :Investigations on its virological nature(2007-02-08) Shanta, P.; Menon, K.P.V.; Patchu Pillai, K.Item Aetiology of the Wilt (Root) disease:Investigations on its virological nature(2007) Shanta, P.; Menon, K.P.V.; Patchu Pillai, K.Item Anatomical changes in the tissues of the tender leaves of coconut palms affected by the root (wilt) disease(2007-02-08) Thomas Joseph; Shanta, P.Item Association of Stephanitis typicus distant with coconut root (wilt) disease(2007-02-08) Shanta, P.; Mathen, K.; Chandy KurianThe root (wilt) disease of coconut, widely prevalent in Kerala is a major threat to this important cash crop. A sap-transmissible pathogen has been demonstrated to be systemically present in the affected palms. Stephanitis typicus Dist. was first reported as a possible vector of the pathogen in 1956. Positive transmission of the disease through this insect both in the field and under controlled conditions were reported. Further studies on this insect have shown that it is also a minor pest of coconut foliage. The range of its food plants, details of life history and information on the predacious habits and life-history of a natural enemy in the field have been gathered. Other studies have thrown light on the pattern of distribution of the insect on the palm, seasonal abundance of the bug in the field and its correlation with meteorological factors as well as its comparative abundance in healthy and diseased trees.Item Cowpea Inoculation Test for Diagnosis of Coconut Wilt Disease in India(2007) Francis O. Holmes; Lal, S.B.; Shanta, P.Item Cowpea inoculation test for diagnosis of coconut wilt disease in India(2007-02-08) Francis O. Holmes; Lal, S.B.; Shanta, P.Item Discussion and preliminary reports cowpea (Vigna sinensis Endl.), an indicator plant for the coconut wilt virus(2007-02-08) Shanta, P.; Menon, K.P.V.Item Distribution and intensity of root (wilt) disease of coconut in Kerala(2007-02-08) Gopinathan Pillai, N.; Lal, S.B.; Shanta, P.A survey conducted recently to study the distribution and intensity of "wilt" disease ofcoconut in Kerala revealed its incidence along with leaf rot disease in six districts: Trivandrum. Quiion, Alleppey, Kottayam, Ernakulam, and Trichur. In the north, the disease occurred upto Ala, Varan-darappally, and Kalloor of Trichur District, in the south, palms in Ncmum,Ottassekharamangalam, and Maranelloor were infected. Earlier reports of the disense were confined to gardens between Quiion and Vamannpuram in the south and Ochenthuruthy and Malayatoor in the north. Sporadic occurrence of this disease was also noticed in Kulasckharam and Vallom villages of Tamil Nadu. The spread was faster, more conspicuous, and rampant in sandy, sandy loam, and clayey soils and on the banks of rivers and canals. Intensity of disease was higher in sandy, sandy loam, and clayey soils than in laterite soils. Over 2-5 lakhs hectares of coconut plantations in Kerala are estimated to be affected by this disease.Item Distribution and intensity of root (wilt) disease of coconut in Kerala(2007) Gopinathan Pillay, N.; Lal, S.B.; Shanta, P.A survey conducted recently to study the distribution and intensity of "wilt" disease of coconut in Kerala revealed its incidence along with leaf rot disease in six districts: Trivandrum, Quilon, Alleppey, Kottayam, ErnakuJam, and Trichur. In the north, the disease occurred upto Ala, Varan-darappally, and Kalloor of Trichur District. In the south, palms in Nemum, Ottassekharamangalam, and Maranelloor were infected. Earlier reports of-the disease were confined to gardens between Quilon and Vamanapuram in the south and Ochenthuruthy and Malayatoor in the north. Sporadic occurrence of this disease was also noticed in Kulasekharam and Vailom villages of Tamil Nadu. The spread was faster, more conspicuous, and rampant in sandy, sandy learn, and clayey soils and on the banks of rivers and canals. Intensity of disease was higher in sandy, sandy loam, and clayey soils than in laterite soils. Over 2-5 lakhs hectares of coconut plantations in Kerala are estimated to be affected by this disease.Item Distribution of root (wilt) pathogen in developing seed coconuts(2007-02-08) Gopinathan Pillay, N.; Shanta, P.; Lal, S.B.Item Distribution of root (wilt) pathogen in developing seed coconuts(1970-04) Gopinathan Pillay, N.; Shanta, P.; Lal, S.B.Item Etiology of the root (wilt) disease of coconut palm(2007-02) Lal, S.B.; Radha, K.; Shanta, P.Item The experimental transmission of coconut wilt virus (cwv) into Areca catechu Linn.(2007-02) Shanta, P.Item Free amino-acids in coconut palms affected by root (wilt) disease(1965-11) Pillai, N.G.; Shanta, P.Item Free amino-acids in coconut palms affected by root (wilt) disease(2007-02) Pillai, N.G.; Shanta, P.Item Oil-Palm (Elaeis Guineensis Jacq.), A Natural Host of Root (Wilt) Disease Pathogen of Coconut(1970-06) Shanta, P.; Gopinathan Pillai, N.; Lal, S.B.Item Possible Association of Tobacco Mosaic Virus with the Root (Wilt) Disease of Coconut(2007) Shanta, P.; Hariharasubramanian, V.; Gopinathan Pillai, N.Experiments to check the presence of tobacco mosaic virus have shown that very low amounts of the coconut strain of TMV could be detected when added to coconut root or leaf extract, showing that if the virus is present, infectivity tests should be adequate for testing the presence of the virus in diseased plants. It. was also possible to distinguish particles of TMV in negatively stained preparations of coconut root and leaf containing TMV. All infectivity tests and electron microscope observations carried out with diseased coconut material yielded negative results for presence of this strain of the virus.