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Response of Selected Cotton Varieties to the Reniform Nematode in Alabama

Stan Usery, Jr., Kathy Mclean, Charles Burmester, Edzard van Santen, and Brad Meyer

ABSTRACT

Management of the reniform nematode (Rotylenchulus reniformis) in cotton production is currently limited to nematicides and crop rotation. However, the discovery of cotton varieties with tolerance levels to the reniform nematode would be a great asset and management tool for producers. Selected transgenic cotton varieties were screened for tolerance and or resistance to the reniform nematode. Selected varieties were evaluated in two producers fields naturally infested with the reniform nematode. The field in Limestone Co., AL was monocultured cotton, conventionally tilled, under irrigation, while the Lawrence Co., AL field was an annual corn cotton rotation, no-tilled, without irrigation. In both field tests, cotton varieties were evaluated on yields and reniform nematode reproduction. Field trials indicated there may be some level of tolerance among certain varieties. Reniform nematode reproduction potential was evaluated in the greenhouse. Greenhouse trials indicated that all of the commercial varieties tested are susceptible to the reniform nematode. Reproduction factors ranged from 13.3 on Sure Grow 747 to 39.5 on Phytogen GA 161.





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Document last modified April 16, 2003