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Selectivity of Methiozolin for Annual Bluegrass (Poa annua) Control in Creeping Bentgrass as Influenced by Temperature and Application Timing

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Diego Gómez de Barreda  and
Jialin Yu
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
Diego Gómez de Barreda
Affiliation:
Ingeniero Agronomo, Universitat Politècnica de València, Camino de Vera s/n, Edificio 3P, 46022 Valencia, Spain
Jialin Yu
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Methiozolin controls annual bluegrass in creeping bentgrass but application timing and temperature could influence efficacy in turf. In field experiments, sequential methiozolin applications totaling 3.36 kg ai ha−1 provided excellent (> 90%) annual bluegrass control at 8 wk after initial treatment when treatments were initiated in February/March or May but programs totaling 0.84 and 1.68 kg ha−1 provided poor control (< 70%) at both timings. Methiozolin at all rates caused minimal turf injury (< 8%) but creeping bentgrass was only injured from February/March applications. In growth chamber experiments, creeping bentgrass injury from methiozolin at 10 C was 2 and 4 times greater than at 20 C and 30 C, respectively, while annual bluegrass injury was similar across temperatures. In laboratory experiments, annual bluegrass had more foliar absorption of 14C-methiozolin than creeping bentgrass at 30/25 C (day/night), compared to 15/10 C, but translocation was similar at both temperatures as > 90% of absorbed 14C remained in the treated leaf after 72 h. Annual bluegrass distributed and recovered more radioactivity to shoots from root-applied 14C-methiozolin than creeping bentgrass while both species had about 2 times more distribution to shoots at 30/25 C than 15/10 C. Metabolites were not detected in annual bluegrass or creeping bentgrass at 1, 3, or 7 d after treatment when grown at 15/10 C or 30/25 C suggesting uptake and translocation contributes to methiozolin selectivity in turfgrass.

Keywords

Annual bluegrass, Poa annua L.creeping bentgrass, Agrostis stolonifera LMetabolismtemperaturetranslocationturfgrassuptake
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 61 , Issue 2 , June 2013 , pp. 209 - 216
Copyright
Copyright © Weed Science Society of America 

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