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1 October 2013 Response of Four Summer Annual Weed Species to Mowing Frequency and Height
RaeLynn A. Butler, Sylvie M. Brouder, William G. Johnson, Kevin D. Gibson
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Greenhouse experiments were conducted in 2011 to evaluate the effect of mowing frequency and mowing height on four summer annual weed species (large crabgrass, barnyardgrass, giant ragweed, and common lambsquarters). Plants were clipped at three heights (5, 10, or 20 cm) and at two frequencies (single clipping or repeated clippings at the same height) to simulate mowing. A nonclipped control was also grown for each species. When clipped once, large crabgrass, barnyardgrass, and giant ragweed produced at least 90% of the total dry weight (DW) of the nonclipped plants, and common lambsquarters produced at least 75%. A single cut was generally not sufficient to prevent weed seed production or kill any of the weeds in this study. Repeated clipping reduced large crabgrass, giant ragweed, and common lambsquarters reproductive DW to 46, 27, and 10% respectively, of the nonclipped control. Barnyardgrass plants that were repeatedly clipped produced between 0 and 8% of the seed DW of nonclipped plants, depending on clipping height. Repeated clipping reduced weed total DW to below 40% for all species compared to nonclipped plants. Our results suggest that, unless combined with other weed management practices, repeated mowing may be necessary to limit the growth and seed production of these weed species.

Nomenclature: Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ECHCG; common lambsquarters, Chenopodium album L. CHEAL, giant ragweed, Ambrosia trifida L. AMBTR; large crabgrass, Digitaria sanguinalis (L.) Scop. DIGSA; velvetleaf, Abutilon theophrasti Medicus ABUTH.

En 2011, se realizaron experimentos de invernadero para evaluar el efecto de la frecuencia y altura de poda (i.e. chapia) en cuatro especies de malezas anuales de verano (Digitaria sanguinalis, Echinochloa crus-galli, Ambrosia trifida, y Chenopodium album). Las plantas fueron podadas a tres alturas (5, 10, ó 20 cm) y a dos frecuencias (poda única o poda repetida a la misma altura) para simular la chapia. También se incluyó un testigo sin poda para cada especie. Cuando se podó una vez, D. sanguinalis, E. crus-galli, y A. trifida produjeron al menos 90% del total del peso seco (DW) de las plantas sin poda, y C. album produjo al menos 75%. Generalmente, una sola poda no fue suficiente para prevenir la producción de semilla de malezas o matar a ninguna de las malezas en este estudio. La poda repetida redujo el DW reproductivo de D. sanguinalis, A. trifida, y C. album en 46, 27, y 10%, respectivamente, en comparación con el testigo sin poda. Las plantas de E. crus-galli que fueron podadas repetidamente produjeron entre 0 y 8% del DW de semillas en comparación con las plantas sin poda, dependiendo de la altura de poda. La poda repetida redujo el DW total por debajo del 40% en todas las especies al compararse con las plantas sin poda. Nuestros resultados sugieren que, a menos que se combine con otras prácticas de manejo de malezas, la poda o chapia repetida podría ser necesaria para limitar el crecimiento y la producción de semillas de estas especies.

RaeLynn A. Butler, Sylvie M. Brouder, William G. Johnson, and Kevin D. Gibson "Response of Four Summer Annual Weed Species to Mowing Frequency and Height," Weed Technology 27(4), 798-802, (1 October 2013).
Received: 31 July 2012; Accepted: 1 May 2013; Published: 1 October 2013
Annual weeds
integrated weed management
mechanical control
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