Seasonal Dynamics and Yield Relationships of Pratylenchus spp. in Corn Roots
Abstract
The seasonal distribution of Pratylenchus spp. in seminal and adventitious roots and the relationship of maize yield variables to nematode densities were examined for irrigated maize in sandy soil in 1994 and 1995. Nematode populations in seminal roots were stable or declined (P = 0.05) during the growing season, whereas total numbers of nematodes in adventitious root systems increased in both years of the study. Late-season nematode densities in adventitious roots were better related to midseason densities in seminal than adventitious roots. Seed test weights were negatively related to Pratylenchus spp. densities in seminal roots in both years (P = 0.05) but inconsistently related to adventitious root populations. Maize yield was inversely related to early-season nematode densities in seminal roots in 1995 (P = 0.03). Regression analyses indicated a 1% loss in seed test weight for each 10-fold increase in nematode density and a 1% loss in seed yield for each 1,000 nematodes/g root. Key words: lesion nematode, maize, population dynamics, Pratylenchus neglectus, Pratylenchus scribneri, yield loss, Zea mays.Downloads
Published
Issue
Section
License
Copyright and Permissions
All material published by the Society of Nematologists (SON), except for papers prepared by United States and Canadian government employees, is copyrighted and protected under the U.S. copyright law. Under the Copyright Act of 1976, the term of copyright for materials registered by an organization is 75 years from the date first published. Before publishing any manuscript, SON requires that authors transfer full and complete ownership of any copyright to SON by signing a JON Page Charge/Copyright Form (.pdf). SON then registers the copyright. Subsequent use of published materials requires written permission from the SON and may be obtained by contacting the current Editor-in-Chief and state where and how the material will be used.
The author warrants that the article is an original work not published elsewhere in whole or in part, except in abstract form, and that the author has full power to make this grant. If portions of the article have been published previously, then the author warrants that permission has been obtained from the copyright holder and the author will submit a copy of the permission release with this copyright transfer form.
SON shall claim no proprietary right other than copyright. Authors and coauthors retain the right to revise, adapt, modify, or otherwise use all or part of the article in future works of the author(s), such as press releases, lectures, and reviews, provided that all such use is for the personal noncommercial benefit of the author(s). All patent rights are retained by the author(s).