Texas Panicum (Panicum texanum) Control in Irrigated Field Corn (Zea mays) with Foramsulfuron, Glyphosate, Nicosulfuron, and Pendimethalin

2006 ◽  
Vol 20 (4) ◽  
pp. 961-964 ◽  
Author(s):  
Eric P. Prostko ◽  
Timothy L. Grey ◽  
Jerry W. Davis
Keyword(s):  
Zea Mays ◽  
Field Trials ◽  
Corn Yield ◽  
Economic Returns ◽  
Net Returns ◽  
Field Corn

Texas panicum is considered to be the most troublesome weed of field corn in the Southeast. Field trials were conducted in Georgia in 2003 and 2004 to compare pendimethalin, nicosulfuron, foramsulfuron, and glyphosate for Texas panicum control in irrigated field corn and to determine which herbicide provided the greatest economic returns. Pendimethalin applied early POST (EPOST), 10 to 12 d after planting (DAP), controlled Texas panicum less than 35% late in the season and resulted in reduced corn yield and net returns in 2004. Glyphosate applied sequentially POST at 21 to 24 DAP and again late POST (LPOST) at 35 to 38 DAP controlled Texas panicum 82 to 94% late in the season compared with 43 to 80% control by nicosulfuron and foramsulfuron applied POST. Texas panicum control, corn yield, and net returns were similar with glyphosate applied POST and LPOST at 0.53 or 1.1 kg ai/ha. Glyphosate applied POST and LPOST was more effective than glyphosate POST, but net returns were greater only in 2004.

Postemergence Horsenettle (Solanum carolinense) Control in Field Corn (Zea mays)

1994 ◽  
Vol 8 (3) ◽  
pp. 441-444 ◽  
Author(s):  
Eric P. Prostko ◽  
Joseph Ingerson-Mahar ◽  
Brad A. Majek
Keyword(s):  
Zea Mays ◽  
New Jersey ◽  
Field Trials ◽  
Solanum Carolinense ◽  
Field Corn ◽  
Herbicide Treatments

Field trials were conducted in New Jersey during 1991 and 1992 to evaluate the efficacy of nicosulfuron, primisulfuron, dicamba, and clopyralid on horsenettle control in field corn. Horsenettle biomass was reduced 74%, 68%, 64%, 61%, 48%, and 40% by primisulfuron + dicamba, primisulfuron, nicosulfuron + dicamba, dicamba, clopyralid, and nicosulfuron, respectively. No treatment was statistically more effective than dicamba. Corn yields were not influenced by the herbicide treatments. Horsenettle populations were not reduced by any treatment.

Integrated Johnsongrass (Sorghum halepense) Management in Field Corn (Zea mays) with Reduced Rates of Nicosulfuron and Cultivation

1999 ◽  
Vol 13 (2) ◽  
pp. 367-373 ◽  
Author(s):  
Enrique Rosales-Robles ◽  
James M. Chandler ◽  
Scott A. Senseman ◽  
Eric P. Prostko
Keyword(s):  
Zea Mays ◽  
Field Experiments ◽  
Perennial Grass ◽  
Economic Benefits ◽  
Management Program ◽  
Sorghum Halepense ◽  
Corn Yield ◽  
Field Corn ◽  
Rhizome Biomass

Johnsongrass, a tall, coarse, perennial grass, is the second most common and troublesome weed in field corn in Texas. Field experiments were conducted in 1996 to 1998 to evaluate an integrated johnsongrass management program in bedded and irrigated field corn. Nicosulfuron at 26.3 g ai/ha applied banded over the row to 50% of the planted area plus one cultivation resulted in johnsongrass control of aboveground and rhizome biomass and in corn yield comparable to the labeled rate (35 g ai/ha) when applied two consecutive years in the same plots. This treatment reduced cost 27% and reduced herbicide input 62% compared to nicosulfuron applied broadcast at labeled rate without cultivation. Economic benefits of this johnsongrass management program are promising for field corn producers.

Economic Evaluation of Common Sunflower (Helianthus annuus) Competition in Field Corn

2012 ◽  
Vol 26 (1) ◽  
pp. 137-144 ◽  
Author(s):  
Nyland R. Falkenberg ◽  
Todd J. Cogdill ◽  
M. Edward Rister ◽  
James M. Chandler
Keyword(s):  
Economic Impact ◽  
Yield Loss ◽  
Field Studies ◽  
Planting Density ◽  
Corn Yield ◽  
Net Returns ◽  
Field Corn ◽  
Corn Prices ◽  
Extended Duration ◽  
Crop Planting

Field studies were conducted near College Station, TX, in 2006 and 2007 to evaluate the economic impact of common sunflower interference in field corn. A density of one common sunflower per 6 m of crop row caused a yield loss of 293 kg ha−1. Estimated losses at a net corn price of $0.08 kg−1was $92 ha−1for infestation levels of four common sunflower plants per 6 m of row. Corn yield was increased by 32 kg ha−1by each 1,000 plant ha−1increase in corn planting density. Corn planting densities of 49,400 and 59,300 plants ha−1provided the greatest net returns with or without the presence of common sunflower competition. Corn yields were reduced by extended duration of sunflower competition, with losses exceeding 1,500 kg ha−1per week and increasing in magnitude at a decreasing rate throughout the growing season. Herbicide treatments provided net returns of $600 to $1,300 ha−1above no weed control in both 2006 and 2007. Net returns of $609 and $653 ha−1were obtained without the use of any herbicide for sunflower control. Determining the economic impact of common sunflower interference in field corn allows producers to estimate the overall net return on the basis of duration of common sunflower interference and density, while considering varying net corn prices, crop planting density, and herbicide application costs.

Weed Management Programs with Pyroxasulfone in Field Corn (Zea mays)

2017 ◽  
Vol 31 (4) ◽  
pp. 496-502 ◽  
Author(s):  
Daniel O. Stephenson ◽  
Jason A. Bond ◽  
James L. Griffin ◽  
Randall L. Landry ◽  
Brandi C. Woolam ◽  
...  
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Weed Management ◽  
Field Experiments ◽  
Management Program ◽  
Post Treatment ◽  
Palmer Amaranth ◽  
Corn Yield ◽  
Field Corn ◽  
Herbicide Treatment

Field experiments were conducted in Louisiana and Mississippi from 2011 through 2013 to evaluate crop injury, weed control, and yield in field corn following pyroxasulfone applied PRE and POST. Pyroxasulfone PRE or POST did not injure corn at any evaluation. Barnyardgrass control was not improved with the addition of any POST treatment to pyroxasulfone alone or atrazine plus pyroxasulfone PRE; however, all POST treatments increased barnyardgrass control to at least 95% at all evaluations following atrazine PRE. All treatments that contained a PRE followed by POST application controlled browntop millet ≥90% at all evaluations. All POST treatments increased ivyleaf morningglory control to ≥92% following atrazine or pyroxasulfone alone PRE. However, control with atrazine plus pyroxasulfone PRE was similar or greater 28 d after POST than all treatments that received a POST application. In the absence of a POST treatment, pyroxasulfone or atrazine plus pyroxasulfone PRE controlled Palmer amaranth 93 to 96% at all evaluations, but atrazine alone PRE provided 84, 82, and 66% control 7, 14, and 28 d after POST, respectively. All programs that contained a PRE followed by POST herbicide treatment controlled Palmer amaranth >90% at all evaluations. Corn yield following all treatments except atrazine alone PRE and the nontreated were similar and ranged from 10990 to 12330 kg ha−1. This research demonstrated that pyroxasulfone can be a valuable tool for weed management in a corn weed management program.

Weed control, environmental impact and profitability with glyphosate tank mixes in glyphosate-tolerant corn

2010 ◽  
Vol 90 (1) ◽  
pp. 125-132 ◽  
Author(s):  
N. Soltani ◽  
L L Van Eerd ◽  
R J Vyn ◽  
C. Shropshire ◽  
P H Sikkema
Keyword(s):  
Zea Mays ◽  
Environmental Impact ◽  
Weed Management ◽  
Zea Mays L ◽  
Field Trials ◽  
Corn Yield ◽  
Single Application ◽  
Common Lambsquarters ◽  
Green Foxtail ◽  
Herbicide Treatments

Eight field trials were conducted over a 3-yr period at Exeter (one site in 2005 and 2006) and Ridgetown (three sites in 2005, two sites in 2006 and one site in 2007), Ontario, to evaluate different postemergence glyphosate tank mixes for weed management in glyphosate-tolerant corn. Treatments included a weedy check, a single application of glyphosate, a sequential application of glyphosate and tank mixes of glyphosate plus either atrazine, dicamba/atrazine, mesotrione, s-metolachlor plus atrazine, s-metolachlor/atrazine, dicamba/diflufenzopyr, and dimethenamid plus atrazine. A single application of glyphosate, the sequential application of glyphosate and tank mixes of glyphosate plus either atrazine, dicamba/atrazine, mesotrione, s-metolachlor plus atrazine, s-metolachlor/atrazine, dicamba/diflufenzopyr, and dimethenamid plus atrazine provided 92-100% control of redroot pigweed, 87-100% control of common ragweed, 74-100% control of common lambsquarters, and 43-100% control of green foxtail. All herbicide treatments had a higher yield than the weedy check. There were no differences in corn yield among the herbicide treatments evaluated. The glyphosate alone or in tank mix combination with mesotrione or dicamba/diflufenzopyr programs had the lowest environmental impact. Glyphosate plus atrazine and dicamba/diflufenzopyr were the most profitable weed management programs in glyphosate-tolerant corn.Key words: Atrazine, dicamba, diflufenzopyr, dimethenamid, glyphosate, mesotrione, pendimethalin, rimsulfuron, s-metolachlor, Zea mays L.

Influence of Herbicide Application Rate, Timing, and Interrow Cultivation on Weed Control and Corn (Zea mays) Yield in Glufosinate-Resistant and Glyphosate-Resistant Corn

1999 ◽  
Vol 13 (4) ◽  
pp. 807-813 ◽  
Author(s):  
Brent E. Tharp ◽  
James J. Kells
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Field Trials ◽  
Application Rate ◽  
Corn Yield ◽  
Herbicide Application ◽  
Weed Species ◽  
Application Timing ◽  
Glufosinate Ammonium ◽  
Application Rates

Field trials were conducted in 1996 and 1997 to determine the influence of glufosinate and glyphosate application rates, application timings, and interrow cultivation on weed control and corn yield. Glufosinate-ammonium rates ranged from 0.18 to 0.41 kg ai/ha, while rates for the isopropylamine salt of glyphosate ranged from 0.21 to 0.84 kg ae/ha. Increasing rates of glufosinate and glyphosate often improved weed control. Control of many of the weed species was improved by delaying herbicide application timing. Weed control was most consistent from late postemergence (LPOST) applications of glufosinate at 0.41 kg ai/ha or glyphosate at 0.84 kg ae/ha. Corn yields were reduced due to incomplete weed control when the lowest rate of glufosinate was applied. Weed control from early postemergence (EPOST) glufosinate and glyphosate applications followed by cultivation was similar to weed control from LPOST glufosinate and glyphosate applications without cultivation. Interrow cultivation following glufosinate or glyphosate application did not affect corn yield.

Woolly Cupgrass (Eriochloa villosa) Control in Corn (Zea mays) with Pendimethalin/Triazine Combinations and Cultivation

Weed Science ◽  
1989 ◽  
Vol 37 (3) ◽  
pp. 405-411 ◽  
Author(s):  
Joseph F. Schuh ◽  
R. Gordon Harvey
Keyword(s):  
Zea Mays ◽  
Environmental Conditions ◽  
Corn Yield ◽  
Early Season ◽  
Late Season ◽  
Field Corn ◽  
Woolly Cupgrass ◽  
Dry Conditions ◽  
Eriochloa Villosa ◽  
Adverse Environmental Conditions

In 1985, 1986, and 1987, pendimethalin at 1.7 kg ai/ha plus 2.2 kg ai/ha cyanazine, 2.2 kg ai/ha atrazine, or 1.1 kg/ha atrazine plus 1.1 kg/ha cyanazine was applied delayed preemergence, early postemergence, and postemergence with and without cultivation to evaluate woolly cupgrass control and corn injury. Results varied from year to year. Dry conditions in 1985 resulted in poorer woolly cupgrass control while cold and wet environments in 1987 resulted in corn injury and reduced yields from postemergence treatments containing cyanazine. Good early-season suppression of woolly cupgrass deteriorated to less than 75% control by the late-season evaluation in all experiments. The best woolly cupgrass control and highest corn yields were usually achieved when herbicide applications were followed by row cultivation. Corn yield increases averaged 28, 17, and 11% in 1985, 1986, and 1987, respectively, when a herbicide treatment was followed by row cultivation. Pendimethalin/triazine treatments followed with a row cultivation adequately suppressed woolly cupgrass in field corn, but adverse environmental conditions often reduced herbicide effectiveness or increased corn injury.

Influence of Stage of Growth and Adjuvants on Fall Panicum Control in Corn with Cyanazine

Weed Science ◽  
1975 ◽  
Vol 23 (3) ◽  
pp. 241-245
Author(s):  
A. D. Kern ◽  
W. F. Meggitt ◽  
Donald Penner
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Vegetable Oil ◽  
Field Trials ◽  
Corn Yield ◽  
Leaf Stage ◽  
Greenhouse Experiments ◽  
Stages Of Growth ◽  
Three Stages ◽  
Panicum Dichotomiflorum

The response of corn (Zea maysL.) and fall panicum (Panicum dichotomiflorumMichx.) to postemergence herbicide applications at three stages of growth was examined. Early postemergence application of cyanazine 2-[[4-chloro-6-(ethylamino)-s-triazine-2-yl] amino]-2- methylpropionitrile at 3.4 kg/ha provided the best control with minimum crop injury and greatest corn yield. A reduction of 25% in corn yield resulted when fall panicum was removed by hand at the seven to eight-leaf stage as compared to removal of plants with two leaves. Various adjuvants increased cyanazine action on both fall panicum and corn in field and greenhouse experiments; however, field trials showed no differences in grain yield at harvest. In the greenhouse, less corn injury was observed with a vegetable oil additive than with other adjuvants.

Adjuvant comparison for postemergence weed control in corn

2010 ◽  
Vol 90 (4) ◽  
pp. 543-547 ◽  
Author(s):  
N. Soltani ◽  
C. Shropshire ◽  
P H Sikkema
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Zea Mays L ◽  
Field Trials ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Corn Yield ◽  
Common Lambsquarters ◽  
Green Foxtail ◽  
Herbicide Treatments

Six field trials were conducted over a 2-yr period (2004 and 2005) at Exeter and Ridgetown, ON, Canada, to evaluate the effect of postemergence application of rimsulfuron plus dicamba plus S-metolachlor/benoxacor, nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr and nicosulfuron plus dicamba/diflufenzopyr with and without Agral 90® or Liberate® non-ionic surfactants on weed control and yield of corn. There was no difference between Agral 90® and Liberate® adjuvant in respect to control of velvetleaf, common ragweed, common lambsquarters and green foxtail. All herbicide treatments provided significantly higher yield than the untreated control. There was also no difference between Agral 90® and Liberate® in respect to corn yield when added to rimsulfuron plus dicamba plus S-metolachlor/benoxacor, nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr and nicosulfuron plus dicamba/diflufenzopyr. Based on these results, Liberate® can be used as an alternative non-ionic surfactant for Agral 90® with the herbicides evaluated.Key words: Agral 90®, benoxacor, dicamba, diflufenzopyr, Liberate®, nicosulfuron, rimsulfuron, S-metolachlor, Zea mays L.

Nicosulfuron and Primisulfuron Eradicate Rhizome Johnsongrass (Sorghum halepense) in Corn (Zea mays) in Three Years

1995 ◽  
Vol 9 (4) ◽  
pp. 748-753 ◽  
Author(s):  
Michael J. Tweedy ◽  
George Kapusta
Keyword(s):  
Zea Mays ◽  
Field Studies ◽  
Sorghum Halepense ◽  
Corn Yield ◽  
Field Corn

Field studies were conducted at Carbondale, IL from 1992 to 1994 to evaluate rhizome johnsongrass control in field corn with nicosulfuron and primisulfuron applied POST without or with EPTC applied PPL EPTC applied PPI at 4480 and 6720 g ai/ha plus dichlormid controlled johnsongrass 38 and 60% in 1992 and 29 and 41% in 1993, respectively, and 0% in 1994. EPTC did not decrease johnsongrass rhizome weight, length, or number of nodes in any year. Nicosulfuron at 35 g/ha and primisulfuron at 40 g/ha applied to 38-cm tall plants controlled 94 to 100% and 85 to 100%, respectively, from 1992 to 1994. Plots treated for three consecutive seasons with nicosulfuron or primisulfuron did not have any rhizomes. Corn yield was more than double in nicosulfuron and primisulfuron plots compared with control plots.

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