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Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 11/7/2008 Publication Date: 1/19/2009 Citation: Davis, R.F. 2008. Alternate row placement is ineffective for cultural control of Meloidogyne incognita in cotton. Journal of Nematology. 40:197-200. Interpretive Summary: The objective of this study was to determine if planting cotton into the space between the previous year's rows reduces crop loss due to nematodes compared to planting in the same row every year. Row placement had a significant effect on nematode counts only on 8 July 2005. Plots receiving nematicide applications had lower nematode counts than non-fumigated plots on 24 May and 8 July in 2005, but not in 2004. The effect of nematicide treatment on nematode counts was not affected by row placement. Row placement did not have a significant effect on root galling or yield in 2004 or 2005. Nematicide treatment decreased root galling in all years, and that effect was not influenced by row placement. Yield was increased by nematicide application in 2004 and 2005, and that effect was not affected by row placement. Percentage yield loss was not affected by row placement. Changing the placement of rows reduced nematode pressure only on one sampling date in only one of the two years studied, but end-of-season root galling and lint yield were not affected by changing the placement of rows, nor was the effect of fumigation on yield influenced by row placement. Therefore, alternate row placement is unlikely to contribute to M. incognita management in cotton. Technical Abstract: The objective of this study was to determine if planting cotton into the space between the previous year's rows reduces crop loss due to nematodes compared to planting in the same row every year. Row placement had a significant (P = 0.05) effect on nematode counts only on 8 July 2005. Plots receiving 1,3-dichloropropene plus aldicarb had lower nematode counts than non-fumigated plots on 24 May and 8 July in 2005, but not in 2004. The effect of nematicide treatment on nematode counts was not affected by row placement. Row placement did not have a significant effect on root galling or yield in 2004 or 2005. Nematicide treatment decreased root galling in all years, and that effect was not influenced by row placement. Yield was increased by nematicide application in 2004 and 2005, and that effect was not affected by row placement. Percentage yield loss was not affected by row placement. Changing the placement of rows reduced nematode pressure only on one sampling date in only one of the two years studied, but end-of-season root galling and lint yield were not affected by changing the placement of rows, nor was the effect of fumigation on yield influenced by row placement. Therefore, row placement is unlikely to contribute to M. incognita management in cotton. |
