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1 March 2000 Interference between Rottboellia cochinchinensis and Zea mays
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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.

Nomenclature: Rottboellia cochinchinensis (Lour.) W. Clayton ROOEX, itchgrass; Zea mays L. DeKalb 689, corn.

Ronald E. Strahan, James L. Griffin, Daniel B. Reynolds, and Donnie K. Miller "Interference between Rottboellia cochinchinensis and Zea mays," Weed Science 48(2), (1 March 2000). https://doi.org/10.1614/0043-1745(2000)048[0205:IBRCAZ]2.0.CO;2
Received: 3 December 1998; Accepted: 1 December 1999; Published: 1 March 2000
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