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Resistance to Root-Knot Nematode in Control of Root-Knot Nematode-Fusarium Wilt Disease Complex in Cotton¹

To determine the efficacy of resistance to root.knot nematode in the control of the root-knot nematode-Fusarium wilt disease complex in cotton (Gossypium hirsutum L.), the response to natural infections with root knot nematode, Meloidogyne incognita (Kofoid and White) Chitwood, and wilt fungus, Fusarium oxysporum Schlecht. f. sp. vasin]ectum (Atk.) Snyd. and Hans., was studied in four cottons that varied in resistance to both organisms. ‘Acala SJ-l’ is susceptible to both organisms, ‘Auburn 56’ is tolerant to Fusarium and moderately resistant to root-knot nematodes, ‘N6072’ is susceptible to Fusarium but highly resistant to root-knot nematodes, and ‘Delcot 277’ is tolerant to Fusazium but susceptible to root-knot nematodes. Control of Fusarium wilt and maintenance of stands were as good in N6072 as in Auburn 56 and Delcot 277. In unfumlgated plots, lint yield of N6072 exceeded those of Acala sJ-I and Delcot 277 by more than 60% and that of Auburn 56 by 18%. The superior performance of N6072 appea~ed to result from its ability to resist root-knot nerdatodes, which helped prevent the develolpment of the wilt disease and subsequent stand and yield losses.

Key Words: Meloidogyne incognita • Fusarium oxysporum f. sp. vasinfectum • nematode resistance • Fusarium resistance • Gossypium hirsutum L.

² Respectively, research agronomist, zoologist, and plant pathologist, U. S. Cotton Research Station, 17053 Shafter Avenue, Shafter, CA 93263; and plant pathologist, Dep. of Plant Pathology, Univ. of California, Berkeley, CA 94720.

Received for publication March 21, 1979.