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Mincu 31 5 14 0 18 41 3 63 PI 215589 23 6 17 0 --46 19 --Root knot caused by Meloidogyne spp. is a serious disease of cucumber (Cucumis sativus L.) in the southeastern United States. In North Carolina, root-knot nematodes destroy ≈11% of the cucumber crop annually (St. Amand and Wehner, 1991). Since M. arenaria (Neal) Chitwood and M. javanica (Treub) Chitwood are often associated with cucumbers grown in this region (Alabama Agr. Expt. Sta., 1960), genetic resistance is an important breeding objective. In our breeding program for nematode resistance, we consider a selection resistant if it has a gall index rating (0% to 100% of roots galled) consistently below 15%, 10 weeks after being inoculated with rootknot nematodes. Walters et al. (1993) identified resistance in cucumber germplasm to several root-knot nematodes, and we are now releasing two inbreds resistant to root knot: NC-42 and NC-43. Two other cultigens, ‘Mincu’ and PI 215589, have also been identified as resistant and are included as comparisons for this germplasm release (Table 1). ‘Mincu’ is one of the parents of NC-43 (Fig. 1), and PI 215589 is similar to NC-42 in that it is an accession of C. sativus var. hardwickii (R.) Alef. (Table 1). NC-42 is a selection of C. sativus var. hardwickii accession LJ 90430 (from the U.S. Dept. of Agriculture program formerly located in La Jolla, Calif.). It has a high level of resistance to four important root-knot nematodes: M. arenaria races 1 and 2, M. javanica, and M. hapla Chitwood (Table 1). Data will not be presented for M. hapla since all cultigens tested so far were resistant (Walters et al., 1990). NC-43 is a selection of C. sativus var.

NC-42 and NC-43: Root-Knot Nematode–Resistant Cucumber Germplasm