The Critical Period of Weed Control in Grain Corn (<i>Zea mays</i>)

Hall, Michael R.; Swanton, Clarence J.; Anderson, Glenn

doi:10.1017/s0043174500051882

Cited by 365 publications

(440 citation statements)

References 15 publications

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“…A three-parameter logistic equation, proposed by Hall et al (1992) and modified by Knezevic et al (2002) was used to describe the effect of increasing duration of weed interference on relative yield. The following logistic equation used was:…”

Section: Field Experiments Were Conducted In 2001 and 2002mentioning

confidence: 99%

“…Studies have been conducted around the world to determine the CPWC in various crops, with a range of environmental conditions (Bedmar et al 1999;Bukun 2004;Dawson 1970;Evans et al 2003;Ghosheh et al 1996;Halford et al 2001;Hall et al 1992;Norsworthy and Oliveira 2004;Van Acker et al 1993). A weed-free period of 50 d following sowing was required to prevent yield loss in Chapingo, Mexico (Nieto et al 1968).…”

Section: Introductionmentioning

confidence: 99%

“…In the southeastern United States, the CPWC began 5 d after corn emergence and ended 53 d after corn emergence (Norsworthy and Oliveira 2004). In Ontario, Canada, Hall et al (1992) showed that the CPWC in corn began at the 3-leaf stage and ended at the 14-leaf stage.…”

Section: Introductionmentioning

confidence: 99%

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The Critical Period for Weed Control in Corn in Turkey

et al. 2006

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Field studies were conducted in 2001 and 2002 in the Black Sea Region of northern Turkey to determine the critical period for weed control (CPWC) in corn and the effects of weed interference on corn height. Treatments of increasing duration of weed interference and weed-free period were imposed at weekly intervals from 0 to 12 wk after crop emergence (WAE). The CPWC was determined with the use of 2.5, 5, and 10% acceptable yield loss levels by fitting logistic and Gompertz equations to relative yield data. With 5% yield loss level, the CPWC was 5 wk, starting at 0.2 WAE and ending at 5.2 WAE, which corresponded to the one- to five-leaf stage of corn. The CPWC increased to 8.9 wk, starting at 0 WAE and ending at 8.9 WAE, at the 2.5% yield loss level. At 10% yield loss level, the CPWC decreased to 1.7 wk, starting at 2.1 WAE and ending at 3.8 WAE.

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Section: Field Experiments Were Conducted In 2001 and 2002mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Critical Period for Weed Control in Corn in Turkey

et al. 2006

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“…To avoid damaging the corn, the hoeing and hand-pulling were stopped at corn silking. Although these hand-weeded plots were not weed free at harvest, weeds emerging after silking and canopy closure do not reduce corn grain yield (Bedmar et al 1999;Hall et al 1992). …”

Section: Herbicide Treatmentsmentioning

confidence: 99%

In-Row and Between-Row Interference by Corn Modifies Annual Weed Control by Preemergence Residual Herbicide

2004

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The presence of row crops, such as field corn, improves herbicidal control of weeds, but the impact of crop row position on herbicide dose–response relationships for weeds is unknown. At midseason at three site-years in Missouri, total weed cover (WC) was reduced by increasing soil residual herbicide rate in a dose-dependent response and was as much as 20% lower in-row (IR) than between-row (BR). Preemergence atrazine +S-metolachlor + clopyralid + flumetsulam at different rates (0×, 0.25×, 0.5×, 0.75×, and 1×, where 1× rate was 2,240 + 1,750 + 210 + 67 g ai/ha, respectively) were applied at planting in field corn to control giant foxtail, the chief weed present, and annual broadleaf weeds, largely common waterhemp. Lower herbicide rates were required to reduce IR WC to the same extent as BR WC, but these rates varied between site-years. At all three site-years, a least squares regression equation adequately described data variability relating corn yield to IR or BR WC (or both) (i.e., Y = a + bBR2, where Y is corn yield in kg/ha, BR is BR WC [%], and a and b are coefficients).

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“…Results from a 2-yr study conducted in several locations throughout the north-central United States suggest that weeds should be controlled in corn before 10-cm weed height, which corresponds to the EP application timing in this study, to avoid grain yield loss (Gower et al 2003). However, the onset of the critical time of weed removal may be variable, ranging from three-to ninecorn leaf stages depending on weed density and environmental factors (Hall et al 1992). In Michigan, when soil moisture was not limiting, grain yield losses did not occur until weeds were 30-cm tall (Dalley et al 2006).…”

Section: Post Herbicide Comparison Common Lambsquarters Control Was mentioning

confidence: 95%

Evaluation of Application Program and Timing in Herbicide-Resistant Corn

et al. 2012

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Field studies were conducted from 2007 to 2009 in East Lansing, MI to evaluate three residual herbicide programs, three POST herbicide application timings, and two POST herbicides in glyphosate- and glufosinate-resistant corn. Herbicide programs included a residual PRE-applied herbicide followed by (fb) POST application (residual fb POST), a residual herbicide tank-mixed with a POST herbicide (residual + POST), and a nonresidual POST. Three POST herbicide application timings included early POST (EP), mid-POST (MP), and late POST (LP) at an average corn growth stage of V3/V4, V4/V5, and V5/V6, respectively. The two POST herbicides evaluated were glyphosate and glufosinate. Control of common lambsquarters and giant foxtail was evaluated 28 d after the LP application. Glyphosate often provided greater weed control than glufosinate. The LP application resulted in greater giant foxtail control compared with the EP application timing, which may be attributed to control of late-emerging weeds. The EP application timing improved common lambsquarters control compared with the LP application timing. The residual + POST program resulted in greater weed control compared with the residual fb POST program in all years. The effect of residual herbicide program, POST herbicide, and POST application timing on corn grain yield varied by year. In 2007, the use of glyphosate resulted in higher grain yield compared with glufosinate. In 2008, corn grain yield was the highest in the PRE fb POST program and with POST applications at EP and MP. To provide the most consistent weed control and minimize the likelihood of grain yield reductions, a PRE fb POST program applied at EP or MP is recommended.

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The Critical Period of Weed Control in Grain Corn (Zea mays)

Cited by 365 publications

References 15 publications

The Critical Period for Weed Control in Corn in Turkey

The Critical Period for Weed Control in Corn in Turkey

In-Row and Between-Row Interference by Corn Modifies Annual Weed Control by Preemergence Residual Herbicide

Evaluation of Application Program and Timing in Herbicide-Resistant Corn

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