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Interference between Rottboellia cochinchinensis and Zea mays

Published online by Cambridge University Press:  20 January 2017

Ronald E. Strahan ,
James L. Griffin ,
Daniel B. Reynolds  and
Donnie K. Miller
Ronald E. Strahan
Affiliation:
Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 302 Life Sciences Building, Baton Rouge, LA 70803
Daniel B. Reynolds
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
Donnie K. Miller
Affiliation:
Northeast Research Station, P.O. Box 438, St. Joseph, LA 71366
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Abstract

Field studies conducted over 2 yr in Louisiana determined critical periods of Rottboellia cochinchinensis interference in Zea mays. In a duration of interference study, R. cochinchinensis was allowed to compete with Z. mays for 0 (weed-free, season-long), 2, 4, 6, 8, 10, 12, or 14 (weedy, season-long) wk, after which plots were maintained weed-free for the rest of the growing season. Rottboellia cochinchinensis biomass at time of initial removal increased linearly as weeks of interference increased. For 2 wk of interference, R. cochinchinensis biomass was greater in 1993 than 1994, but for 4 wk or more of interference, biomass was greater the second year indicating environmental conditions were more conducive to R. cochinchinensis growth in 1994. Season-long R. cochinchinensis interference reduced Z. mays height by 18% compared with the weed-free check. For both years, R. cochinchinensis reduced yields 125 kg ha−1 for each week of interference. In weed-free maintenance studies, 0, 2, 4, 6, 8, 10, 12, or 14 (weed-free, season-long) wk of weed-free conditions were provided, after which R. cochinchinensis was allowed to repopulate. Zea mays yield was equivalent for the weed-free control and plots maintained free of R. cochinchinensis for 2 wk or more. In the interference studies, season-long R. cochinchinensis interference reduced Z. mays yield at least 33% compared with the season-long weed-free check.

Keywords

Rottboellia cochinchinensis (Lour.) W. Clayton ROOEX, itchgrassZea mays L. DeKalb 689, corn.Competitioncrop–weed interactionduration of interferenceFederal noxious weedweed-free maintenance
Type
Research Article
Information
Weed Science , Volume 48 , Issue 2 , April 2000 , pp. 205 - 211
Copyright
Copyright © Weed Science Society of America 

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