Resistance of Tomato, Bean, Southern Pea, and Garden Pea Cultivars to Root-Knot Nematodes Based on Host Suitability. W. W. Hadisoeganda, Former Graduate Student, Department of Plant Pathology, North Carolina State University, Raleigh 27650. J. N. Sasser, Professor, Department of Plant Pathology, North Carolina State University, Raleigh 27650. Plant Dis. 66:145-150. Accepted for publication 29 April 1981. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-145.

Tomato, common bean, lima bean, southern pea, and garden pea were evaluated for resistance to species and races of root-knot nematodes (Meloidogyne spp.). Many of the tomato cultivars tested were highly or very resistant to certain species and races, but none was immune. All tomato cultivars were susceptible to M. hapla. Resistance of Anahu, Atkinson, Healani, Nemared, Patriot, Rossol, and VFN-8 to M. incognita and M. javanica was confirmed. Beef Master, Manalucie, Marmande, Money Maker, Ponderosa, and Roma—previously reported to be resistant—were susceptible in our tests. Tomato cultivars Better Boy, 662 VFN, Monte Carlo, Marmar, Royal Chico, and Rutgers ranged in susceptibility from highly resistant to susceptible based on egg mass indices. They were studied to determine final population, index of reproduction, and egg mass indexes. M. incognita race 4 was more aggressive than races 1, 2, and 3 when Oostenbrink’s reproductive factor was used. Penetration of M. incognita race 1 into tomato roots increased with increasing degree of susceptibility. Bean and southern pea differed in susceptibility to species and races of Meloidogyne. M. incognita race 4 was least aggressive on bean and lima bean. Southern pea varied in resistance to races 1, 2, and 3 of M. incognita. All cultivars of southern pea were either highly or very resistant to race 4.

Keyword(s):