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Effects ofPuccinia xanthii onXanthium strumarium [Compositae]

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Abstract

Plants ofXanthium strumarium L. were inoculated once withPuccinia xanthii Schw. during the 4 leaf stage, others were inoculated 7 times atca. 2 week intervals beginning at the 4 leaf stage, and others were protected from rust infection with regular fungicidal spray applications. Attack byP. xanthii was shown to shorten the plant life cycle and reduce plant growth rate and productivity. Burr production was reduced by up to 59% but percentage seed germination remained unchanged. It was concluded that the overall effects ofP. xanthii, and not reduced burr production alone, may achieve control ofX. strumarium in the field.

Résumé

Des plants deXanthium strumarium L. ont été inoculés une fois au stade 4 feuilles avecPuccinia xanthii Schw, d'autres le furent 7 fois à environ 2 semaines d'intervalle à partir du stade 4 feuilles et d'autres furent protégés contre la rouille par des traitements fongicides. L'attaque parP. xanthii réduit le cycle de développement de la plante, sa croissance et sa productivité. La production de capsules est diminuée jusqu'à 59% mais la faculté germinative des graines n'est pas altérée. On en conclut que l'ensemble des effets deP. xanthii et pas seulement la réduction de production de capsules, peut assurer la lutte contreX. strumarium dans la nature.

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Julien, M.H., Broadbent, J.E. & Matthews, N.C. Effects ofPuccinia xanthii onXanthium strumarium [Compositae] . Entomophaga 24, 29–34 (1979). https://doi.org/10.1007/BF02377506

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