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Entomophaga

, Volume 19, Issue 3, pp 301–309 | Cite as

Host specificity of phytophagous organisms and the evolutionary centres of plant genera or sub-genera

  • A. J. Wapshere
Article

Abstract

Chondrilla juncea is an important weed in Australia. The morphology, ecology and chromosome number of species of the genusChondrilla indicate that the generic centre of evolution is in southern. Bussia and that dispersal has occurred westwards, as far as western Europe, with a reduction in the number ofChondrilla species.

The number of organisms specific toChondrilla also increases as one approaches the generic centre of evolution. Therefore, to discover the greatest number of specific, biological control organisms for a weed, surveys should commence initially at its generic evolutionary centre.

The application of this principle to genera of other important Australian weeds, namely toEchium which has two evolutionary centres and toHeliotropium which has a number of sub-generic evolutionary centres is discussed.

Keywords

Plant Pathology Biological Control Chromosome Number Plant Genus Host Specificity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Chondrilla juncea est une mauvaise herbe importante en Australie. L'écologie, la morphologie et le nombre chromosomique des espèces deChondrilla indiquent que le centre de diversification de ce genre est la Russie méridionale. A partir de cette région, la dispersion en direction de l'ouest a atteint l'Europe occidentale, parallèlement à une diminution du nombre des espèces deChondrilla.

Le nombre des organismes spécifiques àChondrilla augmente à mesure qu'on se rapproche du centre de diversification. En vue de découvrir le nombre maximum d'organismes spécifiques propres à la lutte biologique contre une mauvaise herbe, les recherches doivent en conséquence commencer au centre de diversification.

L'application de ce principe à d'autres genres de mauvaises herbes importantes en Australie est discutée, en particulier pourEchium, dont on connaît deux centres de diversification, etHeliotropium dont chaque sous-genre a un centre de diversification.

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Copyright information

© Le François 1974

Authors and Affiliations

  • A. J. Wapshere
    • 1
  1. 1.CSIRO Biological Control UnitMontpellierFrance

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