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Effects of Meloidogyne spp. and Verticillium dahliae on the growth of two Ixodia achillaeoides populationson the growth of two Ixodia achillaeoides populations

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Abstract

Two populations of Ixodia achillaeoides established from wild plants collected in the Adelaide Hills and the South East areas of South Australia were inoculated with Meloidogyne hapla, M. incognita and M. javanica, alone or in combination with Verticillium dahliae in greenhouse experiments. Both V. dahliae and Meloidogyne spp. infected these two I. achillaeoides populations and suppressed growth. However, symptoms of severe wilting and death that were previously reported in field specimens were not observed in greenhouse plants unless inoculated with both V. dahliae and Meloidogyne spp. Extensive discoloration of vascular tissue of the basal stem, associated with infection by V. dahliae, was also observed only in dying plants infected with both pathogens. These nematodes and the fungus form a disease complex in I. achillaeoides. The population of I. achillaeoides from the Adelaide Hills was significantly more resistant to M. javanica than to either M. incognita or M. hapla, while the population from the South East was significantly more resistant to M. hapla than to the other two species.

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  1. SARDI Plant Research Centre, GPO Box 397, 5001, Adelaide, South Australia, Australia

    G. E. Walker

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  1. G. E. Walker
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Correspondence to G. E. Walker.

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Walker, G.E. Effects of Meloidogyne spp. and Verticillium dahliae on the growth of two Ixodia achillaeoides populationson the growth of two Ixodia achillaeoides populations. Australasian Plant Pathology 29, 81–85 (2000). https://doi.org/10.1071/AP00015

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  • DOI: https://doi.org/10.1071/AP00015

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