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Galling of South Carolina Meloidogyne Incognita Populations on Resistant Cotton Genotypes

C.L. Elliott, S. A. Lewis and J.D. Mueller


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.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 145 - 146
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998