Spatial and Temporal Interactions of Meloidogyne incognita and Soybean
AbstractThe spatial and temporal dynamics of Meloidogyne incognita, relative to soybean shoot and root growth in field microplots, were determined at 11 sampling dates during a growing season. The population dynamics of M. incognita on soybean were dependent on initial population (Pi), soil moisture, and root spatial distribution. Final egg and juvenile population densities were greatest in plots with higher Pi. The population densities of juveniles and eggs were highest from mid- to late-season and were associated with increased soil moisture. Root spatial distributions and M. incognita numbers were closely related. Numbers of juveniles and eggs decreased with soil depth and distance from the center of the row. Greater numbers of juveniles and eggs were found in the upper 30 cm in the row center, and in the upper 15 cm at 10 and 20 cm from the center of the row. There were no consistent differences in root weights between nematode-infected and uninfected plants at any depth or distance from the center of the row. The optimum time for determining the relationship between Pi and soybean shoot growth was from late mid-season (September) to final harvest (14 November). The relationship between Pi and seed yield for the final harvest was best described by a quadratic model: yield (g) = 71.4 + 1.1(log[sub1][sub0][Pi + 1]) - 2.3(log[sub1][sub0][Pi + 1])², (R² = 0.99, P = 0.03). Key words: Glycine max, Meloidogyne incoffnita, nematode, population dynamics, root-knot nematode, soybean, yield loss.
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).