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waters, private wells, and ponds located on-site. Mowing frequency and height vary among cultivars, but growth and pest resistance are optimized when st. augustinegrass is maintained at a height of 2.5–4 inches ( Trenholm et al., 2014 ). Topramezone is a

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control emerged problem broadleaf and grass weeds in sweet corn production. Topramezone is a newly introduced pyrazolone postemergence herbicide. Topramezone inhibits the activity of the 4-hydroxyphenyl pyruvate dioxygenase (HPPD) enzyme, which in

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because they all undergo significant winter senescence in colder regions ( Trenholm et al., 2011 , 2014 , 2015 ). Topramezone is a carotenoid biosynthesis inhibitor that interferes with the production of the enzyme 4-hydroxyphenylpyruvate dioxygenase

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control options (e.g., topramezone, metribuzin) also have activity on warm-season turfgrass, often resulting in unacceptable injury. Developing management techniques to improve the selectivity of POST herbicides provides end-users more options for

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practitioners managing areas planted with ornamental grasses. Topramezone is a new POST herbicide that controls susceptible species by inhibiting the enzyme 4-hydroxyphenylpyruvate dioxygenase (HPPD) ( Grossman and Ehrhardt, 2007 ) and was registered for use

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testing. Results Preliminary study. The ANOVA indicated a significant herbicide treatment effect ( P < 0.05) on seashore paspalum green color ratings ( Table 1 ). At 7 d after the initial spray application (7 DAS01), topramezone resulted in the lowest

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of Agriculture and Consumer Services (FDACS) for quinclorac in 2007 to allow expanded research in aquatic systems. Topramezone is labeled for postemergence weed control in field corn, sweet corn, and popcorn ( Zea mays ). Topramezone rapidly degrades

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control in lakes, ponds, and other water bodies ( Koschnick et al., 2006 ; Michel et al., 2004 ). Thus, the need for additional effective aquatic herbicides is great. The herbicides tested in these experiments—bispyribac-sodium, quinclorac, topramezone

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-inhibiting herbicides are mesotrione and topramezone. Mesotrione, a triketone herbicide, is registered for preemergence (PRE) and postemergence (POST) control of broadleaf and grassy weeds in turf ( Syngenta Professional Products, 2008b ). Topramezone is a pyrazolone

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Professional Products, Greensboro NC), topramezone (Pylex 2.8SC, BASF Corp., Research Triangle Park, NC), triclopyr ester (Turflon Ester; Dow AgroSciences LLC, Indianapolis, IN), or amicarbazone (Xonerate 70WDG; Arysta LifeScience North America LLC, Cary, NC

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