Browsing by Author "Lal, S.B."
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Item 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 Advances in research on the root (wilt) disease problem of Kerala, India(2007-02-08) Lal, S.B.Item The control of root (wilt) disease of coconuts(2007-02-08) Lal, S.B.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 Diagnostic symptoms of root (wilt) disease of coconut(1972-05) Radha, K.; Lal, S.B.Symptoms of the root .(wilt) disease of coconut {Cocas muffera L.) are complex and variable. Of the visual symptoms, Saccidity of leaves or ribbing of leaflets, yellowing of leaves and marginal necrosis of leaflets are frequently associated with the advanced stages of the disease. A comparative assessment of the importance of these foliar symptoms was made on over 7,000 pabns of varying age, growing under different soil conditions, Flaccidity or ribbing of leaflets was the common symptom. In a majority of young palms at an early stage of the disease, this appeared to be the .only symptom. Foliar yellowing and marginal necrosis were not typical of the disease but they set in with the advancement of age and disease, which ultimately completed the disease syndrome. Foliar yellowing was considered to be a delayed expression of nutrient deficiency. Marginal necrosis of leaflets was attributed to fungal infection.Item Diagnostic symptoms of root (wilt) disease of coconut(2007-02-08) Radha, K.; Lal, S.B.Symptoms of the root .(wilt) disease of coconut {Cocas muffera L.) are complex and variable. Of the visual symptoms, Saccidity of leaves or ribbing of leaflets, yellowing of leaves and marginal necrosis of leaflets are frequently associated with the advanced stages of the disease. A comparative assessment of the importance of these foliar symptoms was made on over 7,000 pabns of varying age, growing under different soil conditions, Flaccidity or ribbing of leaflets was the common symptom. In a majority of young palms at an early stage of the disease, this appeared to be the .only symptom. Foliar yellowing and marginal necrosis were not typical of the disease but they set in with the advancement of age and disease, which ultimately completed the disease syndrome. Foliar yellowing was considered to be a delayed expression of nutrient deficiency. Marginal necrosis of leaflets was attributed to fungal infection.Item Diseases of the coconut palm and their control(2007-02-08) Lal, S.B.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 Embryo culture technique to tackle coconut root (wilt)(1965) Sumathy Kutty Amma, B.; Pillai, N.G.; Lal, S.B.Item Embryo culture technique to tackle coconut root (wilt)(2007-02-08) Sumathy Kutty Amma, B.; Pillai, N.G.; Lal, S.B.Item Etiology of the root (wilt) disease of coconut palm(2007-02) Lal, S.B.; Radha, K.; Shanta, P.Item Insecticidal control of rhinoceros beetle helps to Increase yield of coconuts(1966) Sahasranaman, K.N.; Chandy Kurian; Lal, S.B.Item Insecticidal control of rhinoceros beetle helps to Increase yield of coconuts(1966) Sahasranaman, K.N.; Chandy Kurian; Lal, S.B.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 The Problems and Prospects of Coconut Cultivation in Kuttanad(1964) Pillai, N.G.; Pushpadas, M.V.; John Kurian; Lal, S.B.