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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #212369
Title: The multi-year, cummulative effects of monocropping cotton resistant to the southern root-knot nematode, Meloidogyne incognita

Author
item Davis, Richard
item KEMERAIT, R - UNIV OF GA, TIFTON,GA

Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: 6/16/2007
Publication Date: 7/10/2007
Citation: Davis, R.F., Kemerait, R.C. 2007. The multi-year, cummulative effects of monocropping cotton resistant to the southern root-knot nematode, Meloidogyne incognita [abstract]. Journal of Nematology. 39:71-72.

Interpretive Summary:

Technical Abstract: This study documents the cumulative effect of moderate resistance on nematode population density and yield loss when a moderately resistant genotype was grown for three years. Cotton genotypes were Acala NemX (highly resistant, but not adapted to the Southeast), Phytogen PH98-3196 (moderately resistant), and Deltapine DP458 B/R (susceptible). Cotton was grown in fumigated and non-fumigated plots to measure yield loss. Each genotype and nematicide combination was planted in the same place for three years at two sites to document cumulative effects. In 2006, following three years of the different genotypes, all plots at one site were planted with susceptible cotton to document residual effects of planting resistant genotypes. Root galling and nematode population densities in the soil were significantly lower, and percentage yield suppression was numerically lower, when moderately resistant cotton was grown compared to the susceptible standard in both fields in all three years. Differences between susceptible and moderately resistant genotypes are established quickly (after only one season) and then maintained at similar levels in subsequent years. Moderately resistant cotton genotypes are more beneficial than previously believed and should be pursued for their significant contribution to nematode management.