Abstract
Identification of resistant clones is a major strategy in the management of Corynespora leaf fall disease (CLFD) of rubber. Several methods to identify resistance/susceptibility were examined in this study. There were significant variations in the mean lesion scores of different clones when evaluated by laboratory based in vitro assays. When screened in a bud wood nursery, the lesion types agreed with the symptoms observed in field plants. Analysis of results of clones screened under natural conditions showed that 85% of the clones in the Rubber Research Institute of Sri Lanka (RRISL) recommendation list can be ranked as resistant. The results of this investigation suggest that laboratory based in vitro screening methods should be used only for preliminary data. Field experiments, though dependable, take a considerably longer period. As such the bud wood nursery experiments which takes a much shorter time can be recommended to screen planting material for resistance or susceptibility to CLFD.
Zusammenfassung
Die Identifikation resistenter Klone ist eine der Hauptstrategien bei der Bekämpfung der Corynespora-Blattfallkrankheit des Gummibaums. Mehrere Methoden zur Identifizierung resistenter bzw. anfälliger Klone wurden untersucht. Laborbasierte In-vitro-Untersuchungen zeigten signifikante Unterschiede der mittleren Läsionenwerte zwischen den verschiedenen Klonen. Das Screening der Läsionstypen in einem Edelreisgarten stimmte mit den Feldsymptomen überein. Unter natürlichen Wachstumsbedingungen gescreente Klone aus der Empfehlungsliste des Rubber Research Institute of Sri Lanka wurden zu 85% als resistent bewertet. Die Untersuchungen legen nahe, dass laborbasierte In-vitro-Screeningverfahren nur zur Erhebung vorläufiger Daten verwendet werden sollten. Feldversuche erfordern trotz ihrer höheren Zuverlässigkeit bedeutend längere Zeiträume. Experimente im Edelreisgarten können daher aufgrund der sehr viel geringeren Versuchszeiträume für das Screening von Pflanzenmaterial hinsichtlich Resistenz oder Anfälligkeit gegenüber der Corynespora-Blattfallkrankheit des Gummibaums empfohlen werden.
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Fernando, T.H.P.S., Jayasinghe, C.K., Wijesundera, R.L.C. et al. Evaluation of screening methods against Corynespora leaf fall disease of rubber (Hevea brasiliensis). J Plant Dis Prot 117, 24–29 (2010). https://doi.org/10.1007/BF03356329
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DOI: https://doi.org/10.1007/BF03356329