Browsing by Author "Wettasinghe, D.S."

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    Corynespora cassiicola:a fungal pathogen with diverse symptoms on Hevea rubber
    (Rubber Research Institute. Agalawatta, 1999) Jayasinghe, C.K.; Silva, W.P.K.; Wettasinghe, D.S.
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    Effect of combined nitrogen on growth and nodule function or Pueraria phaseoloides
    (Rubber Research Institute. Agalawatta, 1991) Jayasinghe, C.K.; Wettasinghe, D.S.
    Nodulation and nitrogen fixation rates of most of the legumes are reported to be severely affected when they are grown in soils high in available nitrogen. Furthermore, this phenomenon may become more critical when legumes are grown in multiple cropping systems like Pueraria phaseoloides in rubber plantatons where ono legume counterpart is fertilized with nitrogenous fertilizer. Results of experiments conducted in seeding agar to find the effect of nitrogen on growth and nodule function of P. phaseoloides showed that nodulation of P. phaphaeoloides was inhibited at a concentration between 24.4 and 44.8 ppm nitrogen
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    Impact of white root disease incidence on rubber intercropped with tea or cinnamon
    (Rubber Research Institute. Agalawatte, 2004) Jayasuriya, K.E.; Wettasinghe, D.S.
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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.