Postemergence herbicide application timing effects on annual grass control and corn (<i>Zea mays</i>) grain yield

Tapia, Larry S.; Bauman, Thomas T.; Harvey, R. G.; Kells, James J.; Kapuśta, George; Loux, Mark M.; Lueschen, W. E.; Owen, Michael D.; Hageman, Larry H.; Strachan, Stephen

doi:10.1017/s0043174500092596

Cited by 36 publications

(40 citation statements)

References 8 publications

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“…Highest yields in 2000 were obtained from glyphosate treatments where giant foxtail control was highest. Corn yield reductions due to giant foxtail competition have been reported previously (Tapia et al 1997). In 2001, there were no differences in yields between corn treated with mesotrione or mesotrione plus glyphosate.…”

Section: Resultssupporting

confidence: 64%

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)¹

Armel¹,

Wilson

Richardson³

et al. 2003

Weed Technology

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Field studies were conducted in 1999, 2000, and 2001 to investigate weed control and glyphosate-resistant corn tolerance to postemergence applications of mesotrione at 70, 105, and 140 g ai/ha applied with and without glyphosate at 560 g ai/ha. Mesotrione alone and mixed with glyphosate controlled smooth pigweed greater than 97% and common lambsquarters 93 to 99%. Control of common ragweed and morningglory species was variable. Common ragweed control was generally best when mesotrione was applied at 105 or 140 g/ha, and control increased only in 2000 with the addition of glyphosate. Giant foxtail control was below 25% with all rates of mesotrione, but mixtures of mesotrione plus glyphosate controlled giant foxtail 65 to 75%. Mesotrione injured glyphosate-resistant corn 4 to 24% when averaged over glyphosate rates, and injury was usually increased by higher mesotrione rates, with rainfall after herbicide applications, and in mixtures with glyphosate. Injury was transient and did not reduce corn yields. Mesotrione injury on glyphosate-resistant corn was confirmed in the greenhouse, where all mesotrione treatments reduced glyphosate-resistant corn biomass 9 to 23% compared with the nontreated check.

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Section: Resultssupporting

confidence: 64%

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)¹

Armel¹,

Wilson

Richardson³

et al. 2003

Weed Technology

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“…In both years, weed control was incomplete and corn height and grain yield were reduced when applications were delayed until weeds were 20 cm in height. In a multiplelocation study conducted across the midwestern United States, corn grain yield declined when a POST application of nicosulfuron was delayed until giant foxtail was 15 to 23 cm in height (Tapia et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

et al. 2003

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Field studies were conducted at 35 sites throughout the north-central United States in 1998 and 1999 to determine the effect of postemergence glyphosate application timing on weed control and grain yield in glyphosate-resistant corn. Glyphosate was applied at various timings based on the height of the most dominant weed species. Weed control and corn grain yields were considerably more variable when glyphosate was applied only once. The most effective and consistent season-long annual grass and broadleaf weed control occurred when a single glyphosate application was delayed until weeds were 15 cm or taller. Two glyphosate applications provided more consistent weed control when weeds were 10 cm tall or less and higher corn grain yields when weeds were 5 cm tall or less, compared with a single application. Weed control averaged at least 94 and 97% across all sites in 1998 and 1999, respectively, with two glyphosate applications but was occasionally less than 70% because of late emergence of annual grass and Amaranthus spp. or reduced control of Ipomoea spp. With a single application of glyphosate, corn grain yield was most often reduced when the application was delayed until weeds were 23 cm or taller. Averaged across all sites in 1998 and 1999, corn grain yields from a single glyphosate application at the 5-, 10-, 15-, 23-, and 30-cm timings were 93, 94, 93, 91, and 79% of the weed-free control, respectively. There was a significant effect of herbicide treatment on corn grain yield in 23 of the 35 sites when weed reinfestation was prevented with a second glyphosate application. When weed reinfestation was prevented, corn grain yield at the 5-, 10-, and 15-cm application timings was 101, 97, and 93% of the weed-free control, respectively, averaged across all sites. Results of this study suggested that the optimum timing for initial glyphosate application to avoid corn grain yield loss was when weeds were less than 10 cm in height, no more than 23 d after corn planting, and when corn growth was not more advanced than the V4 stage.

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“…1999b) were completely killed with asulam (Hossain 1999). Tapia et al . (1997) reported that nicosulfuron controlled only emerged giant foxtail ( Setaria faberi R. A. W.…”

Section: Resultsmentioning

confidence: 99%

Interval between sequential applications of asulam for regrowth control of torpedograss (Panicum repens L.)

Ishimine

Kuramochi

Akamine

2002

Weed Biology and Management

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Two field experiments each conducted during a 1 year period at the Agricultural Experiment Farm, University of the Ryukyus, Japan evaluated the interval needed between sequential applications of asulam (3 kg ai ha−1) for successful control of torpedograss (Panicum repens L.). Regrowth of torpedograss from rhizomes was lowest when asulam was applied at 40‐day intervals. Application at intervals of 70 days or longer completely controlled above‐ground shoots but not regrowth from rhizomes. Above‐ground biomass of torpedograss regrowth was 7‐ and 49‐fold higher when asulam was applied at 70 and 100 day intervals, respectively, compared with 40‐day intervals. Asulam applied three times at 40‐day intervals starting 40 days after land preparation provided almost total torpedograss control 1 year after the initial application.

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Postemergence herbicide application timing effects on annual grass control and corn (Zea mays) grain yield

Cited by 36 publications

References 8 publications

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)¹

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)¹

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹

Interval between sequential applications of asulam for regrowth control of torpedograss (Panicum repens L.)

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Postemergence herbicide application timing effects on annual grass control and corn (Zea mays) grain yield

Cited by 36 publications

References 8 publications

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)1

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)1

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study1

Interval between sequential applications of asulam for regrowth control of torpedograss (Panicum repens L.)

Contact Info

Product

Resources

About

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)¹

Mesotrione Alone and in Mixtures with Glyphosate in Glyphosate-Resistant Corn (Zea mays)¹

Effect of Postemergence Glyphosate Application Timing on Weed Control and Grain Yield in Glyphosate-Resistant Corn: Results of a 2-Yr Multistate Study¹