Browsing by Author "Wijesundera, R.L.C."
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Item A comparative study of two isolates of Colletotrichum gloeosporioides Penz. from rubber (Hevea brasiliensis Muell.-Arg.)(1987) Senaratna, L.K.; Wijesundera, R.L.C.; De Fonseka, R.N.; Liyanage, A. de S.Item Anti-bacterial activities of volvariella volvacea(National Science Foundation:Colombo, 2001) Perera, W.A.S.W.; Abeytunga, D.T.U.; Wijesundera, R.L.C.Item Antimicrobial constituents of Hypocrea virens, an endophyte of the mangrove-associate plant Premna serratifolia L.(NSF:Colombo, 2016-03) Ratnaweera, P.B.; De Silva, E.D.; Wijesundera, R.L.C.; Andersen, R.L.Item The biotic effect of the surface microflora on phytophthora meadii infection of rubber petioles(Rubber Research Institute . Agalawatta, 2002) Jayasinghe, K.E.; Wijesundera, R.L.C.; Thennakoon, B.I.; Silva, N.Item 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.Item Cylindrocladium quinquesptatum. cultural characteristics and reproductive morphology of the clove isolate IMI 342173 from Sri Lanka(Rubber Research Institute of Sri Lanka. Agalawatte, 1996) Jayasinghe, C.K.; Wijesundera, R.L.C.Cylindrocladium quinquesptatum boeddijn and reitsma, is a destructive pathogen of eugenia caryophyllata (clove) and is identified as a potential pathogen of hevea barasiliensis in Sri Lanka. Further, the fungus infescts a number of ornamental and forest trees. We report using photomicrographs the cultural characteristics abd the morphology of the reproductive structures; condida, vesicle, stipe, phialides, chlamydospores and microsclerotia of clove isolate IMI 342173. Our investigations demonstrates that the isolate IMI 342173 from Sri Lanka resembles the isolates of C. quinqueseptatum obtained from different hosts in other parts of the world.Item Effect of rubber petiole cell walls and virulence of stains on secretion of pectic enzymes by Pytophthora meadii(2007) Jayasuriya, K.E.; Wijesundera, R.L.C.; Thennakoon, B.I.Item Evaluation of DNA markers linked to blast resistant genes, pikh, pit (p), and pita, for parental selection in Sri Lankan rice breeding(Postgraduate Institute of Agriculture, University of Peradeniya:Peradeniya, 2014) Jayawardana, W.A.D.; Jayasekera, G.A.U.; Wijesundera, R.L.C.; Dissanayake, D M.N.; Sooriyapathirana, S.D.S.S.; Weebadde, C.K.; Perera, K.L.N.S.; Gunapala, K.R.D.; Hettige, P.Item Ficus benghalensis(National Science Foundation:Colombo; ii,50p, 2002) Deraniyagala, S.A.; Wijesundera, R.L.C.Item Field sanitation and the occurrence of brown spot disease of rambutan (Nephelium lappaceum) fruits(National Science Council:Colombo, 1999) Sivakumar, D.; Wijeratnam, R.S.W.; Wijesundera, R.L.C.Rambutan fruits harvested from fields where leaf litter was allowed to collected showed a higher incidence and severity of brown spot caused by Gliocephalotrichum microchlamydosporum. G. microchlamydosporum, two other postharvest fungal pathogens, Colletotrichum gloeosporioides and Botryodiplodia theobromac were also isolated from leaf litter.Item Hyphal interactions between Trichoderma viridae and Ganoderma boninense Pat., the cause of coconut root and bole rot(National Science Council of Sri Lanka:Colombo, 1996) Wijesekara, H.T.R.; Wijesundera, R.L.C.; Rajapakse, C.N.K.Item Identification of Trichoderma asperellum from selected fruit plantations of Sri Lanka(NSF:Colombo, 2010-06) Wijesinghe, C.J.; Wijeratnam, R.S.W.; Samarasekara, J.K.R.R.; Wijesundera, R.L.C.Item Investigation of fungicidal activity of some synthetically modified natural products.Amarasekera, A.S.; Wijesundera, R.L.C.Item Investigations on Kaempheria galanga(National Scinece Foundation:Colombo, 2000) Arambewela, L.; Perera, A.; Thambugala, R.; Wijesundera, R.L.C.; Gunatileke, J.Item Investigations on Kaempheria galanga(National Science Foundation of Sri Lanka, 2000-09) Arambewela, L.; Perera, A.; Thambugala, R.; Wijesundera, R.L.C.; Gunatileke, J.Item Investigations on pathotype genetic variation of rice blast fungus (Magnaporthe grisea) isolates in agro ecological zones in Sri Lanka(2010) Mithrasena, Y.J.P.K.; Wijesundera, W.S.S.; Wijesundera, R.L.C.; Dissanayake, D.M.N.Item An isolate of Bacillus subtilis from Sri Lanka inhibitory to Rhizoctonia solani(1994) Wijesundera, R.L.C.; Herath, W.H.M.W.Item Laboratory tests to assay responses of rubber (Hevea brasiliensis)genotypes to Phytophthora meadii(Rubber Research Institute. Agalawatta, 2009) Jayasuriya, K.E.; Wijesundera, R.L.C.Item Pathogenic and genetic diversity of Magneporthe oryzae populations from Sri Lanka(2012) Mithrasena, Y.J.P.K.; Wijesundera, W.S.S.; Wijesundera, R.L.C.; Wimalasiri, D.C.; Priyanthi, R.P.N.Item Penicillium purpurogenum on fruits of Arerrhoa bilimbi in Sri Lanka(1994) Dahanayake, S.; Wijesundera, R.L.C.