Abstract
Alfalfa (Medicago sativa L.) clones with dominant monogenic resistance to the Northern root‐knot nematode (Meloidogyne hapla Chitwood) were used in a backcross breeding procedure to develop resistance in adapted plant materials. Recurrent parents were some of the parent clones of the cultivars ‘Washoe’ and ‘Lahontan’ with resistance to pea aphid, spotted alfalfa aphid, stem nematode and bacterial wilt.Results of these studies indicated that it was relatively easy to transfer a high level of M. hapla resistance into otherwise adapted germ plasm while maintaining resistance to several other pests. Eighty percent of the triplex and quadruplex M. hapla resistant clones were resistant to spotted alfalfa aphids and pea aphids and 65% of the polycross progeny of these clones were resistant to stem nematodes.
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