Crop Science (1999) 39, 418-421

Juma L. Ogallo, Peter B. Goodell, James W. Eckert and Philip A. Roberts (1999)
Management of root-knot nematodes with resistant cotton cv. NemX
Crop Science 39 (2), 418-421
Abstract: Root-knot nematode [Meloidogyne incognita (Kofoid and White) Chitwood] is a serious pest of cotton (Gossypium hirsutum L.) and many crops worldwide. Recent banning of most nematicides has increased the need for development of nematode resistant crop cultivars, such as NemX cotton, which was released in California in 1995. This study was conducted to determine the effectiveness of NemX in suppressing populations of M. incognita and protecting susceptible crops grown in rotation with it. NemX was grown in rotation with susceptible cotton cvs. Maxxa and Pima S7, susceptible lima bean (Phaseolus lunatus L. cv. Henderson), and resistant cowpea [Vigna unguiculata (L.) Walp. cv. CB 88] and alfalfa (Medicago sativa L. cv. WL525HQ). The experiments were done at Shafter, CA, during 1994-1996 on plots with sandy loam soil and natural infestation of M. incognita race 3. NemX suppressed nematode populations strongly in all treatments and one planting was as effective as two successive ones. Lint yield of NemX averaged 1000 kg ha^-1, irrespective of preplant nematode density (Pi). In contrast, yields of susceptible Maxxa cotton varied indirectly with nematode Pi and ranged from 530 to 1360 kg ha^-1. NemX and resistant cowpea or alfalfa had about equal effectiveness in suppressing nematode population density in soil and in protecting a subsequent susceptible crop. Since different species of root-knot nematode attack many crops and M. incognita is the only species that reproduces well in cotton, utilization of NemX will greatly enhance the rotational value of cotton for managing the nematodes.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Philip A. Roberts, Peter B. Goodell

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne incognita	Alfalfa/lucerne (Medicago sativa)
	Meloidogyne incognita	Cotton (Gossypium)
	Meloidogyne incognita	Cowpea and relatives (Vigna)