Journal of the Rubber Research Institute of Sri Lanka
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Item The management of plant diseases with special reference to Hevea(Rubber research Institute. Agalawatte, 1984) Peries, O.S.; Liyanage, A. De S.Item Susceptibility of different leaf stages of Hevea to Corynespora cassiicola(Rubber Research Institute. Agalawatta, 2010) Fernando, T.H.P.S.; Jayasinghe, C.K.; Wijesundera, R.L.C.; Siriwardena, D.Item Recent experiments on the control of abnormal leaf fall disease of rubber in India(Rubber Research Institute. Agalawatta, 1973) Pillai, P.N.R.Item The control of white root disease in Sri Lanka(Rubber Research Institute. Agalawatta, 1973) Liyanage, G.W.; Peries, O.S.Item In vitro interactions between Rigidoporus lignosus, the case of white root disease of rubber and some potentially antagonistic fungi(Rubber Research Institute of Sri Lanka. Agalawatte, 1995) Jayasuriya, K.E.; Deacon, J.W.The modes of aaction of fungi potentially antagonistic against R. lignosus were assessed in vitro by studying their ability (a)to cause pre- or post-contact damage to R. lignosus hyphae in video taped interactions on thin purified water agar films and, (b) to displace the established pathogen from woody inocula. The most fungi were Trichoderma spp. which produced volatile or non-volatile inhibitors. Basidiomycetes such as Trametes sp. caused hyphal interface similar to that of Phlebiopsis gigantea, a commercial biocontrol agent of Heterobasidion annosum in pine stumps. species of Trametes and Aspergillus partially or completely displaced R. lignosus from previousley colonized woody inocula.Item Some issues related to sustainability in the smallholder rubber sector(Rubber Research Institute . Agalawatta, 2007) Wijesuriya, W.; Dissanayake, D.M.A.P.; Herath, K.; Edirisinghe, J.; Abeywardene, V.Item Antimucin - a new water miscible fungicide for the control of black stripe(Rubber Research Institute. Agalawatta, 1959) Riggenbach, A.Item Systemic fungicides as a drench application to control white root disease of rubber(Rubber Research Institute. Agalawatta, 2001) Jayaratne, R.; Wettasinghe, P.C.; Siriwardena, D.; Peiris, P.Item The impact of ecological, cultural and biological factors on the strategy and costs of controlling root diseases in tropical plantation crops as exemplified by Hevea brasiliensis(Rubber Research Institute. Agalawatta, 1977) Fox, R.A.Profitability and the availability of financial, material and manpower resources are studied before starting a commercial enterprise; the longer its term, the more complex the studies. The costs of controlling plantation diseases ( in the tropics or leaf diseases), predictably annual (seasonally induced, juvenil leaf), or perennial (root diseases). Especially in the case of root diseases, the pattern of investment, and hence profitabillity, can be affected by the choice of control measures and their timing, factors which must be evaluated by plant pathologists. These factors are examined in general term and with particular reference to effects on them of some aspects of the ecological, cultural and biological control of major root disease pathologens of some tropical plantation crops, Armillariella (Armillaria) mellea, Ganoderma philippii (pseudoferreum), Phellinus (Fomes) noxius, and Rigidoporus (Fomes) lignosus.Item Investigations on new fungicidal systems for control of bark rot on Hevea brasiliensis(Rubber Research Institute. Agalawatta, 1977) Liyanage, A. De S.; Nadarajah, M.; Liyanage, G.W.; Dantanarayana, D.M.The efficacy of Bark Rot fungicides is significantly impared by frequent rains. The present investigation was therefore undertaken to examine the possibility of increasing the efficacy of panel fungicides by incorporating them in rubber latex. Several didithiocarbamates containing metal ions, chemicals such as zinc oxide and formaldehyde and fungicides recommended for Bark Rot control were used singly or in combination, in in vitro trials. Zinc oxide and Zinc dithiocarbamates were of limited use, while others gave satisfactory results. The influence of rubber serum, on the activity of the chemicals and fungicides was then examined. It was shown that all the materials tested except Ziram inhibited te growth of the fungus. Prevulcanised latex was not found to be suitable as an adjuvant under laboratory conditions. However, satisfactory result were obtained when fungicides were incorporated into high ammonia field latex and high and low-ammonia centrifuged latex. The use of preserved latex as an adjuvant with Antimucin and Thiram (TMTD), singly or in combination, was investigated under field conditions. Infection occurred on tapping panels which were inoculateed after removal of scrap, although fungicides were applied prior to inoculation. Disease also occurred on panels, when the inoculum was removed a week after inoculation, but its spread was arrested when fungicides were applied, indicating that continued applications of fungicides could limit the spread of the disease. Panels which were tapped and protected with Antimucin at the time of collection of latex, when inoculated 4 hours later, without removal of scrap, showed less infection. The significance of these findings, in relation to the control of Bark Rot and the influence of these fungicides on the yield are discussed.