Journal of the Rubber Research Institute of Sri Lanka

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Start date: 1960Subject: search.filters.subject.Plant diseases

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Now showing 1 - 10 of 26
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    Reaction of oriental Hevea clones to isolates of Microcyclus ulei and the response of isolates to fungicides
    (Rubber Research Institute. Agalawatta, 1986) Fernando, E.B.; Hashim, I.
    Hevea clones from Sri Lanka, Malasia and India were assessed in vitro for their resistance to four isolates of microcyclus ulei. Clones SL 26, R-14, 5B/17/4, and 1/2/56/77 were infected by all isolates of M. ulei tested. However, they were found to have some resistance to M. ulei. Propiconazole was more effective than Triforine and Triadimefon in inhibiting germination of conidia of M.ulei. These fungicides were also effective in inhibiting lesion formation. Triadimefon (Bayleton 50 w.p.) had a better curative effect than propiconazole (Tilt 25 EC) and Triforine (Saprol). The effect of Triadimefon on germination of conidia varied between isolate while the effect varied little between isolates for propiconazole and triforine. The effect of the fungicides on the number of lessios on leaf discs did not show major differences between iaolates.
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    A new fungicide to control black stripe disease of rubber (Hevea brasiliensis)
    (Rubber Research Institute. Agalawatta, 1986) Liyanage, N.I.S.; Warnapura, S.S.; Fernando, B.
    A new fungicide code No. San 374 F4 PA09 significantly controlled the spread of black stripe disease on four Hevea clones, artificially inculated with Phytophthora meadii. The same fungicide caused a decrease in the number of depression on the bark in naturally infected trees, although the length of depressions were not reduced. The number of lesions formed owas less after the application of San 374 F4 PA09 compared with all other fungicides tested.
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    Some effects of isolates of Trichoderma on Rigidipourus lignosus
    (Rubber Research Institute. Agalawatta, 1991) Wijesundara, R.L.C.; Jeyanathan, S.; Liyanage, N.I.S.
    Seven forms of Tricoderma were isolated from soil obtained from rubber plantations. All the isolates secreted compounds inhibitory to the growth of Rigidiporus lignosus the causal agent of the white root disease of rubber. Further, the Trichoderma isolates interacted with the hypase of R. lignosus, the interaction resulting in harmfull effects on R. lignosus hyphae. Of the isolates examined T. Koningii isolate IV and T. harzianum appear to be very promising as potential biocontrol agents
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    Susceptibility of Hevea clones to black stripe disease
    (Rubber Research Institute. Agalawatta, 1997) Jayasinghe, C.K.; Wettasinghe, D.S.
    Bark rol or black stripe of Hevea brasiliensis caused by Phytophthora spp.is the only economically important disease of the tapping panel.Screening trials were carried out for three consecutive years at four different localities to evalute the inherent susceptibility of thirty three Hevea clones to black stripe disease.The results indicated that the clones commonly grown in the eastern hemisphere or proved to be potential genetic material for future use show a differential inherent susceptibility with RRIC 130 being the most susceptible.Among the other examined RRIC 119.RRIC 133.RRic 110,RRIC 112,RRIC 114,PB 86,RRIC 117,RRIM 600 and RRIC 132 were susceptible while BPM 24,RRIM 717,RRIC 116,PB 260,RRIC 121 and RRIC 100 were resistant.
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    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.
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    A comparative study of Colletotrichum species causing anthracnose in Hevea
    (Rubber Research Institute. Agalawatta, 2009) Jayasinghe, C.K.; Fernando, T.H.P.S.; Jayawardana, N.
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    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.
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    Penta chloro phenol - effective and economical fungicide for the management of white root disease caused by Rigidoporus lignosus in Sri Lanka
    (Rubber Research Institute of Sri Lanka. Agalawatte, 1995) Jayasinghe, C.K.; Jayasuriya, K.E.; Fernando, T.H.P.S.
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    Observations on phytophthora diseases of Hevea
    (Rubber Research Institute. Agalawatta, 1973) Satchananthavale, V.; Dantanarayana, D.M.
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    Recent experiments on the control of abnormal leaf fall disease of rubber in India
    (Rubber Research Institute. Agalawatta, 1973) Pillai, P.N.R.