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Copyright of Ecologia Mediterranea is the property of Ecologia Mediterranea and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of EPPO Bulletin is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The histopathological change in rootstocks of Citrus has been studied. The citrus nematode, Tylenchulus semipenetrans, induced feeding sites in the root cortical region of sour orange (Citrus aurantium L.). Poncirus trifoliata shows a resistance response by cellular necrosis. Poncirus trifoliata grafted on sour orange induces resistance in roots by cellular necrosis to the mediterranean biotype of the citrus nematode. The resistance of P. trifoliata to T. semipenetrans seems to be related to allelochemical action. [ABSTRACT FROM AUTHOR]