Author
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Davis, Richard |
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MAY, O - UNIVERSITY OF GEORGIA |
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Submitted to: Society of Nematology Abstracts
Publication Type: Abstract Only Publication Acceptance Date: 5/14/2004 Publication Date: 9/1/2004 Citation: Davis, R.F., May, O.L. 2004. The relationship between cultivar yield potential and percentage yield loss to M. incognita in cotton [abstract]. Journal of Nematology. 36:314-315. Interpretive Summary: Technical Abstract: Meloidogyne incognita causes significant yield reductions throughout the U.S. cotton belt. The term resistant means nematode reproduction is inhibited relative to a susceptible standard, whereas tolerance means that crop growth and yield are affected relatively little by nematode parasitism. Virtually all cotton cultivars on the market are susceptible to M. incognita, but their tolerance is not known. The amount and percentage yield suppression caused by M. incognita in 12 high-yielding, high-quality cotton cultivars was measured in a strip-plot study with non-fumigated and fumigated plots for each cultivar. Yield potential for each cultivar was estimated from yield in the fumigated plots. Yield suppression (kg lint/ha) ranged from 18% to 47% in 2002 and 9% to 36% in 2003, and yield potential ranged from 1484 to 2301 kg/ha in 2002 and from 926 to 1486 kg/ha in 2003. It was anticipated that the kilograms lost per hectare would increase as yield potential increased but the percentage yield loss would be similar among the cultivars. However, the percentage yield loss also differed among cultivars such that cultivars with higher yield potentials also had greater percent yield loss to M. incognita. Based on this data, it appears that nematode management is of greater importance in cultivars with higher yield potentials. |
