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Paul C. Bartley III, Glenn R. Wehtje, Anna-Marie Murphy, Wheeler G. Foshee III, and Charles H. Gilliam

-Robertson et al., 1990 ; Fretz, 1972 ; Walker and Williams, 1989 ). Two common management practices for weed control in container plant production are hand weeding and herbicide applications. Hand weeding is an increasingly expensive option because of

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James E. Altland, Charles H. Gilliam, and Glenn Wehtje

Herbicide use is an important component of weed management in field nursery crops. No single herbicide controls all weed species. Oxyfluorfen, simazine, and isoxaben are preemergence herbicides effective against broadleaf weeds. Oryzalin, pendimethalin, and prodiamine are effective in preemergence control of grasses and some small-seeded broadleaf weeds. Metolachlor is the only herbicide currently labeled for nursery crops that is effective in preemergence nutsedge (Cyperus) control. Fluazifop-butyl, sethoxydim, and clethodim are selective postemergence herbicides used for grass control. Glyphosate, paraquat, and glufosinate are nonselective postemergence herbicides used in directed spray applications for broad-spectrum weed control. Bentazon, halosulfuron, and imazaquin are effective postemergence nutsedge herbicides. These herbicides are discussed with respect to their chemical class, mode of action, labeled rates, and current research addressing their effectiveness in nursery crops.

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Gerald M. Henry, Jared A. Hoyle, Leslie L. Beck, Tyler Cooper, Thayne Montague, and Cynthia McKenney

weed control practices are critical in olive orchards to reduce competition for valuable inputs such as water, nutrients, and sunlight, as well as to reduce the likelihood of negative impacts from pests (insects, nematodes, and pathogens) residing on

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Timothy W. Miller, Carl R. Libbey, and Brian G. Maupin

Weed control in matted-row strawberry culture systems of the Pacific Northwest (PNW) is a difficult challenge. Like in most of the northern United States, PNW strawberries are usually produced in a three-year cycle with tillage used for weed and

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Katie J. Kammler, S. Alan Walters, and Bryan G. Young

Weed control is a major issue in jack-o-lantern pumpkin production as a result of the limited number of registered herbicides ( Walters et al., 2008 ). Many of the herbicides currently registered for pumpkins have potential crop injury risks, high

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Steven A. Fennimore, Milton J. Haar, Rachael E. Goodhue, and Christopher Q. Winterbottom

foundation of soilborne disease and weed control in California strawberries ( Wilhelm, 1966 ). Methyl bromide in combination with chloropicrin (Pic) (Tri-Cal, Hollister, CA) controls weeds, soilborne pathogens, and nematodes ( Wilhelm and Paulus, 1980

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Dennis C. Odero, Jose V. Fernandez, and Nikol Havranek

/m 2 over a 30-d growing season. In the organic soils of the EAA, negative effects of weed interference on radish are due to lack of registered effective preemergence or postemergence herbicides for broad-spectrum weed control. Many soil

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Hamid Reza Rajablarijani, Bahram Mirshekari, Majid AghaAlikhani, Varahram Rashidi, and Farhad Farahvash

States to extend the availability of fresh produce for marketing and processing ( Williams, 2008 ). Use of variable sowing dates to control weeds is dependent on time of weed emergence. An awareness of the timing of weed emergence facilitates the planting

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Gregory R. Armel, Robert J. Richardson, Henry P. Wilson, Brian W. Trader, Cory M. Whaley, and Thomas E. Hines

level of weed control may not always be achieved with the use of herbicides applied before weed emergence ( Amador-Ramirez, 2002 ). However, the majority of the herbicides available for weed control in pepper are only selective to pepper when applied as

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James T. Brosnan and Gregory K. Breeden

Pyrimisulfan is a sulfonanilide herbicidal inhibitor of ALS with structural similarity to bispyribac-sodium and pyrithiobac-sodium ( Asakura et al., 2012 ). Pyrimisulfan is used for both pre- and postemergence weed control in rice ( Oryza stricta L