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Variation in root-knot nematode (Meloidogyne spp.) in Crete in relation to control with resistant tomato and pepper

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A targeted survey of vegetable production areas in Crete, Greece, showed that the majority of infestations of rootknot nematodes (RKN) were Meloidogyne javanica. M. incognita appeared to be limited to areas growing pepper that is a host for M. incognita but not for M. javanica. Tests with resistant tomato carrying the Mi gene showed that the M. incognita and the majority of the M. javanica populations were avirulent, and that virulent nematodes could not be selected from them. However, three populations of M. javanica, including some previously identified, were virulent. An AFLP study of the DNA from 22 populations of M. javanica produced 264 scorable amplification products and gave a very high mean similarity (99.4%) between populations, indicating that both virulent and avirulent populations probably derived from the same founder population. Mi-resistant tomato and pepper appear to have considerable utility in the integrated management of RKN in Crete, provided care is taken to monitor the species and virulence or reproductive ability of the nematode populations. Die Variation bei Wurzelgallennematoden (Meloidogyne spp.) auf Kreta in Bezug auf ihre Bekampfung mit resistenten Tomaten und Paprika - Eine gezielte Untersuchung von Gemuseanbaugebieten auf Kreta Griechenland, ergab, dass die Mehrzahl der von Wurzelgallennematoden (RKN) befallenen Flachen mit Meloidogyne javanica verseucht war. M. incognita was offentsichtlich auf Gebiete des Paprikaanbaus beschrankt. Paprika ist ein Wirt fur M. incognita aber nicht fur M. javanica . Versuche mit resistenten Tomaten, die das Mi-Gen besassen, zeigten, dass M. incognita und die Mehrzahl der Populationen von M. javanica avirulent waren, und dass aus ihnen keine virulenten Nematoden selektiert werden konnten. Drei Populationen von M. javanica, darunter schon einige schon vorher identifizierte, waren virulent. Eine AFLP-Untersuchung der DNA von 22 Populationen von M. javanica ergab 264 unterscheidbare Amplifikationsprodukte und zeigte eine hohe mittlere Ahnlichkeit (99,4%) zwischen den Populationen. Dies deutete daraufhin, das virulente and avirulente Populationen wahrscheinlich von der gleichen Grunderpopulation abstammten. Mi-resistente Tomaten und Paprika sind offensichtlich von betrachtlichen Nutzen bei der integrierten Bekampfung von RKN auf Kreta. Voraussetzung ist, dass die Arten und die Virulenz oder die Vermehrungsfahigkeit der Populationen sorgfalting festgestell werden.


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