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Carl J. Della Torre III, William T. Haller, and Lyn A. Gettys

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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Nader Soltani, Peter H. Sikkema, John Zandstra, John O'Sullivan, and Darren E. Robinson

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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William T. Haller, Lyn A. Gettys, and Taizo Uchida

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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Robert Andrew Kerr, Lambert B. McCarty, Matthew Cutulle, William Bridges, and Christopher Saski

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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S. Christopher Marble, Matthew T. Elmore, and James T. Brosnan

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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Alex J. Lindsey, Joseph DeFrank, and Zhiqiang Cheng

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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Lyn A. Gettys and William T. Haller

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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Lyn A. Gettys and William T. Haller

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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James T. Brosnan, Gregory R. Armel, William E. Klingeman III, Gregory K. Breeden, Jose J. Vargas, and Philip C. Flanagan

-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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Matthew T. Elmore, James A. Murphy, and Bradley S. Park

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