Uptake, Translocation, and Metabolism of Methiozolin in Five Weed Species. D. Gómez de Barreda, Polytechnic University of Valencia, Spain; P. McCullough, J. Yu, and S. Sidhu, Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223.

ABSTRACT

Experiments were conducted to evaluate application placement and timing, uptake, translocation, and metabolism of methiozolin on turfgrass weed species.  In greenhouse experiments, preemergence applications of methiozolin provided excellent control (>90%) of annual bluegrass (Poa annua), goosegrass (Eleusine indica), smooth crabgrass (Digitaria ischaemum), large crabgrass (Digitaria sanguinalis), and yellow nutsedge (Cyperus esculentus).  In postemergence experiments, soil and soil + foliar applications of methiozolin reduced biomass of annual bluegrass, goosegrass, smooth crabgrass, and yellow nutsedge more than foliar only applications.  In lab experiments, annual bluegrass, goosegrass, smooth crabgrass, and yellow nutsedge did not metabolize ¹⁴C-methiozolin at 7 days after treatment.  Annual bluegrass, smooth crabgrass, and goosegrass retained >90% of foliar applied ¹⁴C-methiozolin in treated leaves and had minimal translocation to nontreated shoots and roots.  Annual bluegrass translocated more root-absorbed ¹⁴C-methiozolin to shoots than smooth crabgrass but was similar to goosegrass and yellow nutsedge.