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PRE and POST Control of Annual Bluegrass (Poa annua) with Indaziflam

Published online by Cambridge University Press:  20 January 2017

James T. Brosnan ,
Gregory K. Breeden ,
Patrick E. McCullough  and
Gerald M. Henry
James T. Brosnan*
Affiliation:
University of Tennessee, 252 Ellington Plant Sciences Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
Gregory K. Breeden
Affiliation:
University of Tennessee, 252 Ellington Plant Sciences Building, 2431 Joe Johnson Drive, Knoxville, TN 37996
Patrick E. McCullough
Affiliation:
University of Georgia, 1109 Experiment Street, Griffin, GA 30223
Gerald M. Henry
Affiliation:
Texas Tech University, 15th and Detroit, Room 259, Mail Stop 2122, Lubbock, TX 79409
*
Corresponding author's E-mail: jbrosnan@utk.edu
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Abstract

Indaziflam controls annual grassy weeds by inhibiting cellulose biosynthesis. Research was conducted from 2008 to 2011 in Tennessee, Texas, and Georgia evaluating the efficacy of indaziflam for PRE and POST control of annual bluegrass in bermudagrass turf. In Texas, indaziflam at 30, 40, 50, and 60 g ai ha−1 applied PRE provided 93 to 100% annual bluegrass control through 28 wk after treatment. When applied PRE at 80 g ai ha−1 and at 4, 8, and 12 wk after PRE (WAP), indaziflam controlled annual bluegrass 67 to 100% 32 wk after initial treatment (WAIT) in Tennessee; however, reduced efficacy was observed with 12 WAP treatments in a single year of a 2-yr study. Similarly, annual bluegrass control with PRE applications or with 4 and 8 WAP applications of indaziflam at 35 and 52.5 g ai ha−1 ranged from 88 to 100% at 30 WAIT in Tennessee. In Georgia, these rates of indaziflam applied PRE and 4 WAP controlled annual bluegrass 96 to 100% on all evaluation dates and resulted in 97 to 100% reduction in plant counts relative to the untreated control at 30 WAIT. When applied 8 WAP, the 35 and 52.5 g ai ha−1 rates of indaziflam controlled annual bluegrass only 51 to 71% at 30 WAIT in Georgia. Although increasing the application rate of indaziflam treatments 8 WAP provided greater annual bluegrass control, each rate provided significantly lower control when applied 8 WAP compared with PRE or at 4 WAP. No bermudagrass injury was observed in this research. Results suggest indaziflam provides effective PRE and early POST control of annual bluegrass in bermudagrass turf. However, additional research is needed to determine the effects of plant size and maturity on indaziflam efficacy for POST annual bluegrass control.

El indaziflam controla malezas gramíneas anuales inhibiendo la biosíntesis de la celulosa. Se realizó una investigación de 2008 a 2011 en Tennessee (TN), Texas (TX) y Georgia (GA), para evaluar la eficacia de indaziflam en el control pre-emergente (PRE) y pos-emergente de Poa annua en el césped Cynodon dactylon. En TX, indaziflam a 30, 40, 50 y 60 g ia ha−1 proporcionó de 93 a 100% control PRE de P. annua a lo largo de 28 semanas después del tratamiento. Cuando se aplicó PRE a 80 g ia ha−1 y 4, 8 y 12 semanas después de PRE (WAP), el indaziflam controló P. annua de 67 a 100% 32 semanas después del tratamiento inicial (WAIT) en TN. Sin embargo, se observó una reducción en la eficacia con tratamientos 12 WAP, en un solo año de los dos del estudio. De manera similar, el control de P. annua con aplicaciones PRE, 4 WAP y 8 WAP de indaziflam a 35 y 52.5 g ia ha−1 varió de 88 a 100%, 30 WAIT en TN. En GA, estas dosis de indaziflam aplicadas PRE y 4 WAP controlaron la P. annua de 96 a 100% en todas las fechas de evaluación y dieron como resultado de 97 a 100% de reducción en el número de plantas, en comparación al testigo no tratado 30 WAIT. Cuando el indaziflam se aplicó 8 WAP a dosis de 35 y 52.5 g ia ha−1 solamente controló la P. annua de 51 a 71% 30 WAIT en GA. Mientras que el incremento en las dosis de indaziflam a las 8 WAP proporcionó mayor control de P. annua, cada dosis a 8 WAP resultó en un control significativamente menor en comparación con las aplicaciones PRE o 4 WAP. No se observó daño en C. dactylon en esta investigación. Los resultados sugieren que indaziflam proporciona control efectivo de P. annua en PRE y pos-emergencia temprana en césped C. dactylon. Sin embargo, se necesita investigación adicional para determinar los efectos del tamaño y desarrollo de la planta en la eficacia de indaziflam para el control pos-emergente de P. annua.

Keywords

Annual bluegrass, Poa annua L.bermudagrass, Cynodon dactylon (L.) PersGolf courseturfturfgrassweed control
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 26 , Issue 1 , March 2012 , pp. 48 - 53
Copyright
Copyright © Weed Science Society of America 

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