Staff Publications

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    Effect of recovery tapping on yield potential of rubber (Hevea brasiliensis) trees
    (Rubber Research Institute:Agalawatta, 2001) Silva, T.U.K.; Nugawela, A.; Rodrigo, V.H.L.; Serasinghe, P.
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    Rubber cum sugarcane intercropping. a sustainable cropping system for farmers in the intermediate zone of Sri Lanka
    (Rubber Research Institute:Agalawatta, 2000) Rodrigo, V.H.L.; Nugawela, A.; Sivanathan, A.; Witharama, W.R.G.; Jayasinghe, W.K.
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    Evaluation of d/3 tapping with stimulation to alleviate problems related to d/2 tapping of Hevea
    (Rubber Research Institute:Agalawatta, 2000) Nugewela, A.; Peries, M.R.C.; Wijesekera, S.; Samarasekera, R.K.
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    Agronomic and economic benefits of high density banana intercropping during the immature period of rubber with particular emphasis on smallholders
    (Rubber Research Institute:Agalawatta, 2000) Rodrigo, V.H.L.; Stirling, C.M.; Samarasekera, R.K.; Kariyawasam, L.S.; Pathirana, P.D.
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    Cell wall degrading enzyme secretion by Cylindrocladium quinqueseptatum
    (Rubber Research Institute:Agalawatta, 1999) Jayasinghe, C.K.; Wijesundera, R.L.C.
    Cylindrocladium quinqueseptatum causes leaf fall of clove in Sri Lanka and is responsible for the leaf spots of rubber in Malaysia.only one isolate (KP)from four pathogenic isolates examined secreted polygalacturanase(PG) when grown in liquid media.None ofthe isolates secreted pectin lyase(PL).The extracts of clove and rubber leaf tissues,inoculated with the KP isolate did not show any PG and PL activity .The leaf tissue did not have the ability to ingibit c.quinqueseptatum PG produced in culture.All isolates of C.quinquesepltatum secreted cellulases viz.cellobiase and b-glucosidase in culture.cellobiase was detected in the inoculated rubber leaves,The levels of B-glucosidase,an ingerent enzyme of Hevea leaves,also increased rapidly following infection.The results indicate that pectic enxymes play a minimal or no role in disease developmet of C.quinqueseptatum infecton in cloves and Hevea.Thus cellulolyic enzyme probably play a nutritive role.
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    The rubber seed production in Sri Lanka. results of an islandwide survey
    (Rubber Research Institute:Agalawatta, 1999) Seneviratna, P.; Witharana, L.P.P.; De Alwis, M.N.
    Seed Production of rubber plantations in certain areas of Sri Lanka has gone down to very low levels affecting the quality of the planting material I.e.budded stump.An island wide survey was therefore conducted to gain soem knowledge on the quality and the quantity of the seeds produced on different clones in different climatic regions of Sri Lanka.the results confirmed that the regional effects most probably owing to climatic and weather factors are the main causes while the clonal effect was minimum.It was evident that the seed production in dry region is far more than the country's requirement for the production of budded stumps for annual repllanting programme.
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    Improving phase morphology and properties of NR/NBR blends with compatibilizers
    (Rubber Research Institute:Agalawatta, 1998) De Silva, K.G.K.; Lewan, M.
    Two compatibilizing agent have been identified for NR/NBR blend to improve the phase morphology and interfaial adhesion, thereby improving the physical and technological properties. Light and optical microscopy and Nuclear Magnetic Resonance have been used to study the phase contrast and crosslink distribution of the elastomer blends respectively, to suport the observations mode on the improvements in the physical properties of these blends.
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    Shade effects on photosynthesis of cinnamon (Cinnamomum verum J. Pres)
    (Rubber Research Institute:Agalawatta, 1998) Pathirana, L.S.S.; Nugawela, A.; Samarasekera, R.K.
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    Cultural characteristics and reproductive morphology of Geotrichum sp.. a guide to distinguish Geotrichum from Rigidoporus microporus
    (Rubber Research Institute:Agalawatta, 1998) Jayasinghe, C.K.; Wettasinghe, J.L.P.C.
    Culture characteristics of Geotrichum sp. isolate IMI 354411, a fungus responsible for the saprophytic colonization on Hevea roots are described. It was also shown that this fungus could be easily distinguished from Regidoporus lignosus, a devastating pathogens of Hevea roots, by the zonate and cloudy appearence of its colonies on malt agar with a cream undersurface and the disarticulating hyphae which later break upto arthric conidia.
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    Some aspects of biochemical changes due to maturation of acid and papain treated Hevea latex
    (Rubber Research Institute:Agalawatta, 1998) Dissanayake, W.; Yapa, P.A.J.
    Biochemical changes that occur due to maturation of acid and papain treated Hevea latex were investigated. An increase in bacterial population in latex of both acid and papain treated, was significantly higher than that in acid treated latex. Higher microbial activity correlated with decreases in carbohydrate and amino acid levels in serum. Maturation of papain treated latex, enhances protein digestion and reduction in ash content without any adverse effect on major raw rubber properties.