Susceptibility of redbuds (Cercis) to root-knot nematodes

Abstract

The native E American redbud (Cercis canadensis) was susceptible to parasitization by the northern root-knot nematode (Meloidogyne hapla), which produced galls and viable egg masses on this host. Two Chinese redbud species, C. chinensis and C. yunnanensis, were similar to C. canadensis in being susceptible to M. hapla and also apparently resistant to the reproduction of the other nematodes. Three other species (C. occidentalis from W United States, C. racemosa from China, and C. siliquastrum from Europe) were also susceptible to M. hapla as well as to M. arenaria, M. incognita, and M. javanica. This is the first report of root-knot nematodes on Cercis. The potential for synergism between the nematodes and Verticillium wilt fungi is discussed. -Authors