Journal of the Rubber Research Institute of Sri Lanka

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Subject: search.filters.subject.Rigidoporus lignosus

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    Economical and less hazardous fungicide for the management of white root disease
    (Rubber Research Institute. Agalawatta, 1997) Jayaratne, R.; Jayasinghe; Wettasinghe
    Rigidoporus lignosus, the causal agent of white root disease is the most destructive root pathogen of Hevea brasiliensis in Sri Lanka.presently 5-8% of the cultivated lands are affected with this deadly disease and are under bare patches. The recommended fungicides in Sri Lanka,Pentachloro nitrobenzene (PCNB)and Pentachloro phenol (PCP),were prohibited due to high mammalian toxicity and the fungicides of the triazole family which are being recommended in other countries such as Malayasia and Ivory Coast are not acceptable to Sri Lankan rubber growers due to the high costs of these chemicals. The observations of experiments carried out with less toxic chemicals revealed that 8-10% phenol in bituminous base could be used as an effective fungicidal "Collar protectant"in the management of white root disease in Sri Lanka.In this paper the econimics and the toxicological impact on the environment are also discussed.
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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 the development of the sporophore of Rigidoporus lignosus and the release and germination of basidiospores
    (Rubber Research Institute of Sri Lanka. Agalawaththa, 1982) Liyanage, I.; Peries, O.S.; Liyanage, A. de S.; Wettasinghe, C.
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    Weakening effect of 2-furaldehyde on Rigidoporus lignosus the cause of white root disease of rubber
    (Rubber Research Institute of Sri Lanka. Agalawatte, 1996) Jayasuriya, K.E.; Deacon, J.W.; Fernando, T.H.P.S.
    Furfuraldehyde is recognized as a potential fumigant which has the ability to weaken rigidoporus lignosus in artificially or naturally infected rubber root inocula. Addition of sulphur to soil at 100 g per 75 Kg of soil, inactivated or prevented the formation of R. lignosus mycelial cords from artificially or naturally infected inocula. Drenching 2.4 per cent aqueous solution of furfuraldehyde in to soil (1 liter/75 Kg) where R. lignosus inocula were buried, caused weakening or inactivation of R. lignosus in artificially or naturally infected inocula. However, combination of two treatments had no ssynergistic effect on both types of R. lignosus inocula in soil.
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    A possible role for 2-furaldehyde in the biological control of white root disease of rubber
    (Rubber Research Institute of Sri Lanka. Agalawatte, 1996) Jayasuriya, K.E.; Deacon, J.W.
    Different control methods were tested against rigidoporus lignosus mycelial cord growth in soil in highly artificial conditions. 0.2 per cent furfuraldehyde in malt extract agar caused 50 per cent inhibition of the growth of R. lignosus. Effect of soil fumigation with furfuraldehyde, addition of sterilized oat bran to soil and addition of spores of trichoderma strains to soil were evaluated. A 45 per cent inhibition of mycelial cord growth was achived by the addition of spores of trichoderma harizanum (strain TV 12b) along with sterilized oat bran as 0.5 per cent supplement to soil. Combination of treatments did not increase the inhibition than did either treatments alone. Different trichoderma species behaved differently in fumigated or unfumigated soil. Soil fumigation with furfuraldehyde enhanced growth of other fungal inhabitants simultaneously reducing R. lignosus growth.