Host Status of Lisianthus `Mariachi Lime Green' for Three Species of Root-knot Nematodes

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  • 1 Department of Nematology, University of California, Riverside, CA 92521
  • 2 University of California Cooperative Extension, Santa Cruz County, 1432 Freedom Blvd., Watsonville, CA 95076
  • 3 Department of Nematology, University of California, Riverside, CA 92521

Lisianthus [Eustoma grandiflorum (Raf.) Shinn.] plants were grown in soil infested with increasing densities of Meloidogyne hapla Chitwood, M. incognita (Kofoid & White) Chitwood, or M. javanica (Treub) Chitwood, root-knot nematodes. Compared to tomato plants grown in soil with the same nematode numbers and species, lisianthus had less severe root symptoms, suffered less damage, and resulted in lower nematode multiplication rates. Lisianthus was a better host for M. javanica than for M. incognita, and a poor host for M. hapla. Lisianthus shoot weights were significantly reduced after inoculation with M. javanica or M. hapla, but not after M. incognita inoculation. The number of flowers produced per lisianthus plant was reduced by all three nematode species. The results show that the root-knot nematode species that are most common in California may cause significant damage in the cut-flower production of lisianthus.

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