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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), 205-211, (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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