ABSTRACT
Most cultivars currently marketed in the United States have excellent resistance to the fusarium wilt/root-knot nematode (Meloidogyne incognita) complex. Many cultivars are, however, still very susceptible to yield losses caused directly by root-knot nematode. Some cultivars, such as ‘NemX', Stoneville's ‘LA 887', and Paymaster ‘1560', exhibit moderate levels of resistance. Excellent resistance to root-knot nematode is available in unadapted germplasm or genotypes such as Auburn 634 or M-315, many of which are derived from Clevewilt 6-8, but lack acceptable agronomic traits. Preliminary data (J. L. Starr, pers. comm.) has indicated that some naturally occurring root-knot nematode populations are virulent on resistance derived from Clevewilt 6-8. Our objective was to determine whether populations virulent on commonly used sources of resistance are present in South Carolina.
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