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Identification of New Sources of Resistance to Root-knot Nematodes in Phaseolus

Dep. of Nematology, Univ. of California, Riverside, CA 92521

P. A. Roberts and J. G. Waines

Univ. of California, Kearney Agric. Center, Parlier, 93648
Dep. of Botany and Plant Sciences, Univ. of California, Riverside, CA 92521

^* Corresponding author.

Resistance to root-knot nematode, Meloidogyne incognita (Kofoid and white) Chitwood, has been identified and incorporated into commercial cultivars of common bean, Phaseolus vulgaris L. However, the effective use of host resistance as a management tactic against root-knot nematodes attacking common bean requires identification and incorporation of resistance to other economically important root-knot nematodes, namely M.javanica (Treub) Chitwood, M. arenaria and M. hapla. Fifty-four common bean and 64 tepary bean, P. acutifolius A. Gray, lines were screened for resistance to root-knot nematodes under greenhouse and growth chamber conditions. In the greenhouse, the plants were grown in pots filled with loamy sand and, in the growth chamber, the plants were grown in growth pouches. Bean plants in the greehouse were inoculated with 5000 nematode eggs and evaluated for nematode reproduction (eggs) 6 wk after inoculation. In the growth chamber, plants were inoculated with 1000 second-stage juveniles and evaluated for egg numbers 4 wk after inoculation. Common bean lines PI 165426 and Alabama no. 1 were found to be resistant to M. incognita Race 2, 3 and 4 but were susceptible to M. incognita Race 1 and to M. arenaria. Breeding lines A252, A315, A328, A443 and A445 were resistant to M. javanica and M. incognita Race 1. Resistance in the A lines was found to be derived from two common bean landraces, G1805 and G2618. The resistance was also effective against M. arenaria. The tepary bean accession PI 310606 was found to have good resistance to all nematode isolates tested. We postulate that resistance derived from G1805 and G2618 may be under different genetic control than that in PI 165426 and Alabama no. 1.

Received for publication November 25, 1988.