Abstract
Under laboratory conditionsAphis chloris Koch has been demonstrated to be specific to plants belonging to the genusHypericum. It can effect severe damage to its principal host,H. perforatum L., and shows good potential for contributing to the control of this noxious weed. Other species ofHypericum are less favoured hosts ofA. chloris and would not be endangered by it.
A. chloris shows a high level of host-discrimination and does not transmit persistent viruses between non-host plants. Whereas in the laboratory it is capable of transmitting non-persistent viruses, it would contribute only marginally to the risk of virus transfer posed by the Australian aphid fauna as a whole, and its release would not necessitate changes to existing control practices, where these are required to reduce plant virus transmission.
As a consequence,A. chloris is considered safe for release againstH. perforatum in Australia.
Résumé
Les tests réalisés au laboratoire montrent qu'A. chloris est spécifique des plantes du genreHypericum. Provoquant d'importants dégats sur son hôte principal,Hypericum perforatum, ce puceron peut contribuer efficacement au contrôle de cette mauvaise herbe. Les autres espèces d'Hypericum sont nettement moins attaquées et donc peu menacées par son introduction.
Aphis chloris présente un niveau de discrimination élevé lors du choix de sa plante hôte; il ne transmet pas de virus persistants entre plantes non-hôtes. Bien que capable, au laboratoire, de transmettre des virus non-persistants, il ne contribuerait que très marginalement, en cas d'introduction aux risques de propagation de virus posés par l'ensemble des aphides australiens. Son lâcher ne devrait pas impliquer de modifications dans les techniques de lutte mises en œuvre pour limiter la transmission des virus entre plantes.
Ces résultats permettent d'envisager sans risque l'introduction d'Aphis chloris en Australie dans le cadre de la lutte biologique contreHypericum perforatum.
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Briese, D.T. Host-specificity and virus-vector potential ofAphis chloris [Hemiptera: Aphididae], a biological control agent for St John's wort in Australia. Entomophaga 34, 247–264 (1989). https://doi.org/10.1007/BF02372674
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DOI: https://doi.org/10.1007/BF02372674