Abstract
Field studies were conducted in 2006 and 2007 to investigate the reaction of 10 varieties of kenaf (Hibiscus cannabinus) to natural infestation of Meloidogyne incognita. Ten weeks after planting, 10 randomly selected plants per variety were assessed for root galling. Data were also collected on plant height, stem girth, days to maturity, number of seeds and seed yield. Gall index and nematode reproduction factor varied significantly among the kenaf varieties. AU 64 recorded the tallest height of 2.4 and 2.3 m, respectively, in 2006 and 2007 cropping seasons followed by Ex-Funtua, Ifeken 100 and G 45 whereas the lowest height was recorded for Ifeken 400 and Cuba 108. Days to maturity ranged from 120 to 135 days. Based on gall index ratings, AU 64, Ex-Shika, Ex-Giwa, G45, and the local variety were susceptible to M. incognita. Tianung 1 and Cuba 108 were very susceptible, whereas Ifeken 100 and 400 were resistant. Based on reproduction factor, AU 64, Ex-Shika, Ex-Giwa, G 45, Ex-Funtua and the local variety supported greater nematode reproduction and were good hosts of root-knot nematodes. Tianung 1 and Cuba 108 were very susceptible while Ifeken 100 was a poor host of M. incognita.
Zusammenfassung
In den Jahren 2006 und 2007 wurde die Resistenz von 10 Sorten von Kenaf (Hibiscus cannabinus; Ostindische Hanfrose, Gambohanf) gegenüber dem Wurzelgallennematoden Meloidogyne incognita im Feld überprüft. Zehn Wochen nach dem Pflanzen wurden 10 zufällig ausgewählte Pflanzen pro Sorte auf Wurzelgallen untersucht. Daneben wurden die Pflanzenhöhe, der Sprossumfang, die Zeit bis zur Vollreife, die Samenanzahl und der Samenertrag gemessen. Der Gallenindex und der Reproduktionsfaktor der Nematoden unterschieden sich deutlich zwischen den Kenafsorten. Die Sorte AU 64 erreichte mit 2,4 bzw. 2,3 m 2006 und 2007 die größte Höhe, gefolgt von den Sorten Ex-Funtua, Ifeken 100 und G 45, während die Sorten Ifeken 400 und Cuba 108 die geringsten Höhen aufwiesen. Die Zeit bis zur Vollreife variierte zwischen 120 und 135 Tagen. Anhand des Gallenindex wurden die Sorten AU 64, Ex-Shika, Ex-Giwa, G45 und eine lokale Sorte als anfällig gegenüber M. incognita bewertet. Die Sorten Tianung 1 und Cuba 108 waren hoch anfällig, während Ifeken 100 und 400 als resistent bewertet wurden. Anhand des Reproduktionsfaktors vermehrten sich die Nematoden an den Sorten AU 64, Ex-Shika, Ex-Giwa, G 45, Ex-Funtua und der lokalen Sorte schneller, weshalb sie als gute Nematodenwirte gelten können.
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Adegbite, A.A., Agbaje, G.O., Akande, M.O. et al. Expression of resistance to Meloidogyne incognita in kenaf cultivars (Hibiscus cannabinus) under field conditions. J Plant Dis Prot 115, 238–240 (2008). https://doi.org/10.1007/BF03356270
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DOI: https://doi.org/10.1007/BF03356270