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Spring Establishment of Four Warm-Season Turfgrasses After Fall Indaziflam Applications

Published online by Cambridge University Press:  20 January 2017

Diego Gómez de Barreda
Affiliation:
Universitat Politècnica de València, Camino de Vera s/n, Edificio 3P, 46022 Valencia, Spain
Thomas V. Reed
Affiliation:
University of Georgia, 1109 Experiment Street, Griffin, GA 30223
Jialin Yu
Affiliation:
University of Georgia, 1109 Experiment Street, Griffin, GA 30223
Patrick E. McCullough*
Affiliation:
University of Georgia, 1109 Experiment Street, Griffin, GA 30223
*
Corresponding author: [email protected]

Abstract

Indaziflam is an effective PRE herbicide for annual bluegrass control, but soil residual effects could inhibit spring turf establishment in treated areas. To test this hypothesis, field experiments were conducted to evaluate establishment of bermudagrass, centipedegrass, St. Augustinegrass, and zoysiagrass after fall indaziflam applications. Lateral spread of turfgrasses from plugs in summer generally had no meaningful differences from treatments. However, high indaziflam rates (70 and 140 g ai ha−1) had approximately two-fold more nonrooted stolons than the nontreated control while low rates (17.5 and 35 g ha−1), oxadiazon at 3360 g ai ha−1, and prodiamine at 840 g ai ha−1 were similar to the nontreated. Indaziflam at 70 g ha−1 and prodiamine applications in fall reduced sprig establishment of the four turf species from the nontreated control, but oxadiazon and low rates of indaziflam were similar. Bermudagrass establishment from seed was significantly reduced (20 to 50%) by indaziflam at 35 to 140 g ha−1, prodiamine, and oxadiazon, on several dates, but the low rate of indaziflam was similar to the nontreated at 10 wk after seeding. Overall, fall indaziflam applications at 17.5 to 35 g ha−1 appear safe on vegetative establishment of four warm-season turfgrasses in spring but reseeding bermudagrass in areas treated with rates > 17.5 g ha−1 may cause unacceptable delays in growth.

Indaziflam es un herbicida PRE efectivo para el control de Poa annua, pero los efectos residuales en el suelo en áreas tratadas podrían inhibir el establecimiento del césped en la primavera. Para evaluar esta hipótesis, se realizaron experimentos de campo para evaluar el establecimiento de los céspedes Cynodon dactylon x C. transvaalensis (bermuda), Eremochloa ophiuroides (centipede), Stenotaphrum secundatum (St. Augustine), y Zoysia matrella (zoysia) después de aplicaciones de indaziflam en el otoño anterior. En el verano, el crecimiento lateral a partir de los estolones sembrados generalmente no tuvo diferencias importantes producto de los tratamientos. Sin embargo, las dosis altas de indaziflam (70 y 140 g ai ha−1) tuvieron aproximadamente dos veces más estolones sin enraizar que el testigo sin tratar, mientras que las dosis bajas (17.5 y 35 g ha−1), oxadiazon a 3360 g ai ha−1, y prodiamine a 840 g ai ha−1 fueron similares al testigo sin tratar. Las aplicaciones de indaziflam a 70 g ha−1 y prodiamine en el otoño redujeron el establecimiento de los estolones recién sembrados de las cuatro especies de césped en comparación con el control no tratado, pero oxadiazon y las dosis bajas de indaziflam fueron similares. El establecimiento del césped bermuda a partir de semilla fue reducido significativamente (20 a 50%) por indaziflam a 35 y 140 g ha−1, prodiamine, y oxadiazon, en varias fechas, pero la dosis baja de indaziflam fue similar el testigo sin tratar a 10 semanas después de la siembra. En general, las aplicaciones de indaziflam en el otoño a 17.5 a 35 g ha−1 parecen seguras para el establecimiento vegetativo en la primavera de cuatro especies de césped de clima cálido, pero el césped bermuda de resiembra en áreas tratadas con dosis >17.5 g ha−1 podría causar retrasos inaceptables en el crecimiento.

Type
Weed Management—Major Crops
Copyright
Copyright © Weed Science Society of America 

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