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1 September 2014 Weed Control with Liquid Carbon Dioxide in Established Turfgrass
Denis J. Mahoney, Matthew D. Jeffries, Travis W. Gannon
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In recent years, increasing implementation of biological, cultural, and mechanical weed-control methods is desired; however, many of these techniques are not viable in established turfgrass systems. The use of freezing or frost for weed control has previously been researched; however, is not well elucidated. Field and greenhouse experiments were conducted to evaluate liquid carbon dioxide (LCD) for weed control in established turfgrass systems. LCD was applied with handheld prototypes that were modified to reduce the amount of LCD required for weed control. Common annual and perennial turfgrass weeds included common chickweed, corn speedwell, goosegrass, large crabgrass, smooth crabgrass, Virginia buttonweed, and white clover. Turfgrass tolerance was evaluated on the following species: hybrid bermudagrass, Kentucky bluegrass, tall fescue, and zoysiagrass. The final modification allowed for lower output (0.5 kg LCD min−1) when compared with the initial prototype (3 kg LCD min−1). In general, weed control increased as LCD increased. When comparing weed species life cycles, annuals were controlled more than perennials (P < 0.0001) at 14 and 28 d after treatment (DAT). Further, exposure time affected control as white clover, Virginia buttonweed, and large crabgrass control was greater (18, 14, 15%, respectively) from the longer exposure time (30 vs. 15 s), although equivalent amounts of LCD (30 kg m−2) were applied. These data also suggest that plant maturity affects control, as large crabgrass control in one- to two- and three- to four-leaf stages (> 90%) was greater than in the one- to two-tiller stage (< 70%). Turfgrass injury at 7 DAT was unacceptable (> 30%) on all species, but declined to 0% by 28 DAT. These data suggest that LCD has the potential to provide an alternative for weed control of select species where synthetic herbicides are not allowed or desired.

Nomenclature: Common chickweed; Stellaria media (L.) Vill.; corn speedwell; Veronica arvensis L.; goosegrass; Eleusine indica (L.) Gaertn.; large crabgrass; Digitaria sanguinalis (L.) Scop.; smooth crabgrass; Digitaria ischaemum (Schreb.) Schreb. ex Muhl.; Virginia buttonweed; Diodia virginiana L.; white clover; Trifolium repens L.; hybrid bermudagrass; Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt-Davey; cv. ‘Tifway 419′; Kentucky bluegrass; Poa pratensis L. ‘Unique'; tall fescue; Lolium arundinaceum (Schreb.) S.J. Darbyshire ‘Confederate'; zoysiagrass; Zoysia japonica Steud. ‘El Toro'.

En años recientes, se ha hecho deseable el aumento en la implementación de métodos de control de malezas de tipo biológico, cultural, y mecánico. Sin embargo, muchas de estas técnicas no son viables en sistemas de césped establecido. El uso de congelación para el control de malezas ha sido previamente investigado aunque no ha sido bien elucidado. Se realizaron experimentos de campo e invernadero para evaluar el carbon dioxide líquido (LCD) para el control de malezas en sistemas de césped establecido. Se aplicó LCD con prototipos manuales que fueron modificados para reducir la cantidad de LCD requerido para controlar las malezas. Las malezas anuales y perennes comunes en céspedes incluyeron Stellaria media, Veronica arvensis, Eleusine indica, Digitaria sanguinalis, Digitaria ischaeum, Diodia

Denis J. Mahoney, Matthew D. Jeffries, and Travis W. Gannon "Weed Control with Liquid Carbon Dioxide in Established Turfgrass," Weed Technology 28(3), 560-568, (1 September 2014).
Received: 8 January 2014; Accepted: 1 March 2014; Published: 1 September 2014
nonchemical weed control
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