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Effects of Soil vs. Foliar Application of Amicarbazone on Annual Bluegrass (Poa annua)

Published online by Cambridge University Press:  20 January 2017

D. H. Perry ,
J. S. McElroy  and
R. H. Walker
D. H. Perry*
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
J. S. McElroy
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
R. H. Walker
Affiliation:
Department of Agronomy and Soils, Auburn University, Auburn, AL 36849
*
Corresponding author's E-mail: [email protected]
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Abstract

Amicarbazone is a photosystem II (PSII) inhibiting herbicide of the triazolinone herbicide family. Greenhouse experiments were conducted to compare the effects of amicarbazone and atrazine on annual bluegrass control and quantum yield (ΦPSII) when applied at three treatment placements (soil-only, foliage-only, and foliage + soil). Herbicide rates for amicarbazone and atrazine were 0.53 and 2.25 kg ha−1, respectively. Amicarbazone applied soil-only and foliage + soil controlled annual bluegrass 57 and 59%, respectively, 1 wk after treatment (WAT). Atrazine applied to foliage + soil controlled annual bluegrass 48% at 1 WAT. All soil-only and foliage + soil treatments were similar 2 WAT. Foliage-only application of amicarbazone provided significantly less control than other amicarbazone treatments throughout the study. Amicarbazone applied soil-only and foliage + soil controlled annual bluegrass 100% at 3 WAT. Soil-only and foliage + soil applications of atrazine and amicarbazone had similar reductions in quantum yield (ΦPSII) at 1 to 3 WAT. Foliar-applied amicarbazone reduced ΦPSII 78, 84, and 86% at 1, 2, and 3 WAT, respectively. The rapid reduction in annual bluegrass ΦPSII and the increase in control resulting from soil contact of amicarbazone indicate root exposure of amicarbazone is beneficial for annual bluegrass control.

Amicarbazone es un herbicida inhibidor del fotosistema II (PSII) de la familia de herbicidas triazolinone. Se realizaron experimentos de invernadero para comparar los efectos de amicarbazone y atrazine en el control de Poa annua y en su rendimiento cuántico (ΦPSII) cuando se aplicaron en tres tipos de tratamiento (solamente al suelo, solamente al follaje, y follaje + suelo). Las dosis de amicarbazone y atrazine fueron 0.53 y 2.25 kg ha−1, respectivamente. Amicarbazone aplicado solamente al suelo y al follaje + suelo controló P. annua 57 y 59%, respectivamente, 1 semana después del tratamiento (WAT). Atrazine aplicado al follaje + suelo controló la maleza antes mencionada 48% 1 WAT. Todos los tratamientos de solamente al suelo y de follaje+suelo fueron similares 2 WAT. A lo largo del estudio, la aplicación solamente al follaje de amicarbazone resultó en significativamente menos control que otros tratamientos con el mismo herbicida. Amicarbazone aplicado solamente al suelo y al follaje + suelo controló P. annua 100% 3 WAT. Las aplicaciones solamente al suelo y follaje + suelo de atrazine y amicarbazone resultaron en reducciones similares en el rendimiento cuántico (ΦPSII) 1 a 3 WAT. Amicarbazone aplicado al follaje redujo ΦPSII 78, 84 y 86% a 1, 2 y 3 WAT, respectivamente. La rápida reducción de ΦPSII en P. annua y el incremento en el control resultante del contacto de amicarbazone en el suelo, indican que la exposición de la raíz al herbicida mejora el control de P. annua.

Keywords

Amicarbazone, 4-amino-N-(1,1-dimethylethyl)-4,5-dihydro-3-(1-methylethyl)-5-oxo-1H-1,2,4-triazole-1-carboxamideannual bluegrass, Poa annua L.Photosystem IIquantum yieldchlorophyll fluorescencechlorosis
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 4 , December 2011 , pp. 604 - 608
Copyright
Copyright © Weed Science Society of America 

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