Biologically Effective Dose and Selectivity of RPA 201772 for Preemergence Weed Control in Corn (Zea mays)

1998 ◽  
Vol 12 (4) ◽  
pp. 670-676 ◽  
Author(s):  
Stevan Z. Knezevic ◽  
Peter H. Sikkema ◽  
Francois Tardif ◽  
Allan S. Hamill ◽  
Kevin Chandler ◽  
...  
Keyword(s):  
Weed Control ◽  
Field Studies ◽  
Response Curves ◽  
Southern Ontario ◽  
Common Lambsquarters ◽  
Wild Buckwheat ◽  
Crop Tolerance ◽  
Wild Mustard ◽  
Effective Doses ◽  
Corn Grain

Field studies were conducted in 1996 and 1997 at three locations throughout southern Ontario with the objective of developing dose-response curves of RPA 201772 for weed control and crop tolerance in corn. The biologically effective doses required to control redroot pigweed, velvetleaf, and wild mustard were 100, 90, and 80 g/ha, respectively. Yellow foxtail was controlled with 100 to 120 g/ha, while rates for common lambsquarters varied from 60 to 130 g/ha, depending on the year and location. Wild buckwheat control was poor (> 30%) at all of the doses tested. RPA 201772 did not reduce corn grain yield; however, temporary crop injury was evident on coarse sandy soils.

Application Timing for Weed Control in Corn (Zea mays) with Dicamba Tank Mixtures

1997 ◽  
Vol 11 (3) ◽  
pp. 602-607 ◽  
Author(s):  
Eric Spandl ◽  
Thomas L. Rabaey ◽  
James J. Kells ◽  
R. Gordon Harvey
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Field Studies ◽  
Corn Yield ◽  
Application Timing ◽  
Common Lambsquarters ◽  
Giant Foxtail ◽  
Corn Grain ◽  
Corn Grain Yield

Optimal application timing for dicamba–acetamide tank mixes was examined in field studies conducted in Michigan and Wisconsin from 1993 to 1995. Dicamba was tank mixed with alachlor, metolachlor, or SAN 582H and applied at planting, 7 d after planting, and 14 d after planting. Additional dicamba plus alachlor tank mixes applied at all three timings were followed by nicosulfuron postemergence to determine the effects of noncontrolled grass weeds on corn yield. Delaying application of dicamba–acetamide tank mixes until 14 d after planting often resulted in lower and less consistent giant foxtail control compared with applications at planting or 7 d after planting. Corn grain yield was reduced at one site where giant foxtail control was lower when application was delayed until 14 d after planting. Common lambsquarters control was excellent with 7 or 14 d after planting applications. At one site, common lambsquarters control and corn yield was reduced by application at planting. Dicamba–alachlor tank mixes applied 7 d after planting provided similar weed control or corn yield, while at planting and 14 d after planting applications provided less consistent weed control or corn yield than a sequential alachlor plus dicamba treatment or an atrazine-based program.

Controlling Broadleaf Weeds in Soybeans by Bentazon in Minnesota

Weed Science ◽  
1974 ◽  
Vol 22 (2) ◽  
pp. 136-142 ◽  
Author(s):  
Robert N. Andersen ◽  
William E. Lueschen ◽  
Dennis D. Warnes ◽  
Wallace W. Nelson
Keyword(s):  
Weed Control ◽  
Chenopodium Album ◽  
Field Studies ◽  
Ambrosia Artemisiifolia ◽  
Common Lambsquarters ◽  
Low Area ◽  
Wild Mustard ◽  
Polygonum Pensylvanicum ◽  
Brassica Kaber ◽  
Over The Top

In field studies, bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-(4)3H-one 2,2-dioxide] was applied as postemergence sprays over the top of weeds and soybeans[Glycine max(L.) Merr.]. Bentazon at 0.84 to 1.68 kg/ha applied as an early postemergence treatment controlled wild mustard[Brassica kaber(DC.) L.C. Wheeler var.pinnatifida(Stokes) L.C. Wheeler], common ragweed (Ambrosia artemisiifoliaL.), velvetleaf (Abutilon theophrastiMedic.), Pennsylvania smartweed, (Polygonum pensylvanicumL.), common cocklebur (Xanthium pensylvanicumWallr.), and wild common sunflower (Helianthus annuusL.). Pigweeds (Amaranthussp.) were controlled by applications in the three true-leaf stage but became more resistant at later stages. Control of common lambsquarters (Chenopodium albumL.) was erratic. The optimum time for controlling weeds with bentazon was around the first trifoliolate stage of soybeans. Rainfall within several hours after treatment reduced weed control. Eight yield studies, two of which included eight cultivars, were conducted on weed-free soybeans. In none were yields reduced significantly by bentazon at 3.36 kg/ha (the highest rate studied). Eight yield studies were conducted on soybeans infested with common cocklebur or velvetleaf. Weed control was generally excellent with 0.84 kg/ha of bentazon. Where infestations were sufficient to reduce yields, bentazon treatments increased the yields to levels generally comparable with those of the handweeded checks. One exception was an application of bentazon to soybeans growing in a low area that was periodically flooded by heavy rains. In that experiment the benefit of controlling common cocklebur was offset by bentazon injury to the soybeans, and yields from the treated plots were about the same as those of the weedy check.

Herbicide Combinations for Postemergent Weed Control in Safflower (Carthamus tinctorius)

1990 ◽  
Vol 4 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Robert E. Blackshaw ◽  
Douglas A. Derksen ◽  
H.-Henning Muendel
Keyword(s):  
Weed Control ◽  
Field Studies ◽  
Carthamus Tinctorius ◽  
Quality Data ◽  
Wild Oat ◽  
Common Lambsquarters ◽  
Wild Mustard ◽  
Yield And Quality ◽  
Green Foxtail ◽  
Field Control

Greenhouse and field studies were conducted to examine the interaction of sethoxydim or fluazifop-P tank mixed with chlorsulfuron or thiameturon for selective weed control in safflower. Under greenhouse conditions, the addition of chlorsulfuron to sethoxydim or fluazifop-P slightly improved the control of green foxtail above that achieved with either herbicide alone. Control of wild oat and wild mustard was similar with the tank mixes and each herbicide alone. In the field, control of wild oat with sethoxydim or fluazifop-P was not altered by adding chlorsulfuron or thiameturon in tank mixes. Similarly, control of common lambsquarters and wild mustard with chlorsulfuron or thiameturon was not affected by adding either sethoxydim or fluazifop-P in tank mixes. Plant height, date of flowering, seed yield, and quality data indicated that safflower tolerated these herbicides applied alone or in combination. Sethoxydim or fluazifop-P tank mixed with chlorsulfuron or thiameturon provide a postemergent alternative for selective control of grass and broadleaf weeds in safflower.

Preemergence Broadleaf Weed Control and Crop Tolerance in Imidazolinone-Resistant and -Susceptible Corn (Zea mays)

1997 ◽  
Vol 11 (1) ◽  
pp. 118-122 ◽  
Author(s):  
Christy L. Sprague ◽  
Edward W. Stoller ◽  
Stephen E. Hart
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Field Studies ◽  
Susceptible Variety ◽  
Common Lambsquarters ◽  
Crop Tolerance ◽  
Herbicide Treatments ◽  
Ac 263,222 ◽  
Low Rate

Field studies were conducted in 1994 and 1995 at Dekalb and Urbana, IL, to evaluate preemergence broadleaf weed control and crop tolerance in imidazolinone resistant (IR) and susceptible (non-IR) corn using atrazine, imazethapyr, AC 263,222, CGA-152005, MON 12000 with and without MON 13900 (a safener), and flumetsulam + clopyralid. When sufficient rainfall occurred within 28 d of application to insure herbicide absorption, the IR corn variety was more tolerant than the susceptible variety to imazethapyr, AC 263,222, CGA-152005 at 40 and 80 g/ha, and MON 12000 with and without MON 13900. Overall crop tolerance of IR corn was equal to that of corn treated with atrazine for all herbicide treatments except CGA-152005, which injured IR corn. Control of velvetleaf, common lambsquarters, Pennsylvania smartweed, tall morningglory, and jimsonweed for all herbicide treatments was equal or superior to that of atrazine at 1.7 kg/ha. However, control of common cocklebur was significantly greater with atrazine compared to imazethapyr and the low rate of CGA-152005.

Influence of Weed Control on Weed Population in Ridge-till Corn (Zea mays)

Weed Science ◽  
1996 ◽  
Vol 44 (4) ◽  
pp. 903-910
Author(s):  
Gail A. Wicks ◽  
Robert G. Wilson ◽  
Garold W. Mahnken ◽  
Gordon E. Hanson
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Field Studies ◽  
Grain Yields ◽  
Common Lambsquarters ◽  
Weed Population ◽  
Green Foxtail ◽  
Herbicide Treatments ◽  
Corn Grain

Field studies were conducted to determine the influence of annual herbicide treatments plus cultivation on weed populations and corn yields in ridge-till corn during a 3-yr period at Mitchell, NE, and a 7-yr period at North Platte, NE. When the experiment was initiated at North Platte, no weeds were present before corn planting. It took 4 yr before triazine-resistant kochia became a problem before corn planting in plots treated with atrazine, but these were controlled by other operations prior to corn harvest. In the cultivated check, green foxtail densities before harvest increased from 0 in 1985 to 32 plants 100 m−2in 1991. Annual applications of dicamba plus 2,4-D 10 d early preplant followed by cultivation controlled triazine-resistant kochia and velvetleaf, but common lambsquarters, nightshade species, and green foxtail increased. Volunteer corn was controlled with cultivation. After 3 yr at Mitchell, the annual weed population increased 10-fold in the cultivated check. Thus, corn yields were reduced 64% with two cultivations compared with an annual early preplant application of dicamba plus 2,4-D followed by alachlor plus cyanazine PRE and two cultivations. With two cultivations under low annual weed populations at North Platte, grain yield from the cultivated check treatment was not different from annual treatments of herbicides after 7 yr. Metolachlor plus atrazine occasionally caused a reduction in corn grain yields.

scholarly journals Weed Control in Corn (Zea maysL.) as Influenced by Preemergence Herbicides

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Travis W. Janak ◽  
W. James Grichar
Keyword(s):  
Weed Control ◽  
Active Ingredient ◽  
Field Studies ◽  
Crop Tolerance ◽  
Field Corn ◽  
South Central ◽  
Central Texas ◽  
Annual Grasses ◽  
Preemergence Herbicides ◽  
Corn Grain

Field studies were conducted in central and south-central Texas from 2013 through 2015 to evaluate crop tolerance and efficacy of various preemergence herbicides alone and in combination for weed control in field corn. Acetochlor and pendimethalin alone,S-metolachlor plus mesotrione, and the three-way combination ofS-metolachlor plus atrazine plus mesotrione provided the most consistent control of annual grasses including browntop panicum (Panicum fasciculatumL.), Texas millet (Urochloa texanaL.), barnyardgrass (Echinochloa crus-galliL.), and sprawling signalgrass (Brachiaria reptansL.). Palmer amaranth [Amaranthus palmeri(S.) Wats.] control was at least 90% with fluthiacet-methyl plus pyroxasulfone, atrazine plus either acetochlor, alachlor, dimethenamid-P,S-metolachlor, orS-metolachlor plus mesotrione, saflufenacil plus dimethenamid-P, andS-metolachlor plus mesotrione. Hophornbeam copperleaf (Acalypha ostryifoliaL.) was difficult to control; however, acetochlor, saflufenacil or pyroxasulfone alone, saflufenacil plus dimethenamid-P, andS-metolachlor plus mesotrione provided at least 90% control. Acetochlor or saflufenacil alone, thiencarbazone-methyl plus isoxaflutole, dimethenamid-P plus atrazine, rimsulfuron plus mesotrione, and saflufenacil plus dimethenamid-P controlled common sunflower (Helianthus annuusL.) at least 90%. Corn injury was minimal (≤3%) with all herbicides. In general, corn grain yield was greatest with herbicide treatments containing more than one active ingredient compared with a single active ingredient.

Efficacy of Saflufenacil plus Dimethenamid-P for Weed Control in Corn

2011 ◽  
Vol 25 (3) ◽  
pp. 330-334 ◽  
Author(s):  
Meghan Moran ◽  
Peter H. Sikkema ◽  
Clarence J. Swanton
Keyword(s):  
Weed Control ◽  
Field Experiments ◽  
Dose Range ◽  
Dry Weight ◽  
Single Treatment ◽  
Growth Reduction ◽  
Southern Ontario ◽  
Common Lambsquarters ◽  
Wild Mustard ◽  
Species Specific

A new, prepackaged mixture of saflufenacil + dimethenamid-P has been introduced for PRE control of grass and broadleaf weeds in corn. Field experiments with this new herbicide combination were conducted in 2008 and 2009 at four locations in southern Ontario, Canada. The objective of this study was to determine the dose of saflufenacil + dimethenamid-P required for overall weed control and species-specific weed control, as well as the dose required for early season weed control when followed with glyphosate at the six- to eight-leaf corn stage. Based on weed dry weight, the GR95 across locations ranged from 126 to 675 g ha−1. The 95% growth reduction (GR95) for common ragweed, common lambsquarters, pigweed, and wild mustard were 933, 325, 186, and 115 g ha−1, respectively. Highest corn yields were achieved with saflufenacil + dimethenamid-P applied alone at doses ranging from 368 to 1470 g ha−1. When followed by glyphosate, the dose range of saflufenacil + dimethenamid-P required to achieve the greatest corn yields was 46 to 1,470 g ha−1. A minimum dose of 184 g ha−1 of saflufenacil + dimethenamid-P followed by glyphosate was required for the yield to exceed that of the single treatment of glyphosate applied alone.

Weed Control in Potato (Solanum tuberosum) with Rimsulfuron and Metribuzin

1998 ◽  
Vol 12 (2) ◽  
pp. 406-409 ◽  
Author(s):  
Karen A. Renner ◽  
Gary E. Powell
Keyword(s):  
Solanum Tuberosum ◽  
Weed Control ◽  
Russet Burbank Potato ◽  
Field Studies ◽  
Potato Yield ◽  
Russet Burbank ◽  
Common Lambsquarters ◽  
Wild Buckwheat ◽  
Redroot Pigweed

Field studies were conducted for 3 yr to determine weed and potato response to preemergence (PRE) and postemergence (POST) applications of rimsulfuron, metribuzin, and rimsulfuron plus metribuzin. Preemergence applications of rimsulfuron at 27 g ai/ha and POST applications at 18 g/ha controlled barnyardgrass, redroot pigweed, and wild buckwheat. Common lambsquarters was controlled by PRE or POST applications of metribuzin or a tank mixture of 18 g/ha rimsulfuron plus 140 g ai/ha of metribuzin. ‘Russet Burbank’ potato was relatively tolerant to all rimsulfuron, metribuzin, and rimsulfuron plus metribuzin applications, and potato yield was not reduced compared to the hand-weeded control.

Postemergence AC 263,222 Systems for Weed Control in Peanut (Arachis hypogaea)

Weed Science ◽  
1996 ◽  
Vol 44 (3) ◽  
pp. 615-621 ◽  
Author(s):  
John W. Wilcut ◽  
John S. Richburg ◽  
Gerald L. Wiley ◽  
F. Robert Walls
Keyword(s):  
North Carolina ◽  
Weed Control ◽  
Arachis Hypogaea ◽  
Field Studies ◽  
Common Lambsquarters ◽  
Yellow Nutsedge ◽  
Crop Injury ◽  
Ac 263,222 ◽  
Prickly Sida

Field studies in 1990 and 1991 at six locations in Georgia and one location in North Carolina evaluated AC 263,222 for weed control, peanut tolerance, and yield. AC 263,222 applied early postemergence at 71 g ai ha−1controlled bristly starbur, coffee senna, common lambsquarters,Ipomoeaspecies, prickly sida, sicklepod, smallflower morningglory, and yellow nutsedge at least 91%. AC 263,222 controlled common cocklebur 77% and Florida beggarweed from 47 to 100%. Crop injury was 4% for AC 263,222 applied once and 12% or less from two applications. Mixtures of bentazon with AC 263,222 did not improve control compared to AC 263,222 alone. Imazethapyr did not improve control of AC 263,222 systems. In several locations, bentazon reduced control of Florida beggarweed with AC 263,222 when applied in a mixture compared to AC 263,222 alone. Weed control from the standard of paraquat plus bentazon applied early postemergence followed by paraquat, bentazon plus 2,4-DB applied POST did not provide the level or spectrum of weed control as AC 263,222 systems.

Influence of Rainfall on the Phytotoxicity of Foliarly Applied 2,4-D

Weed Science ◽  
1981 ◽  
Vol 29 (3) ◽  
pp. 349-355 ◽  
Author(s):  
Richard Behrens ◽  
M. A. Elakkad
Keyword(s):  
Chenopodium Album ◽  
Field Studies ◽  
Amaranthus Retroflexus ◽  
Time Interval ◽  
Simulated Rainfall ◽  
Response Level ◽  
Common Lambsquarters ◽  
Wild Mustard ◽  
Dichlorophenoxy Acetic Acid ◽  
Brassica Kaber

To study rainfall effects, simulated rainfall was applied to velvetleaf (Abutilon theophrastiMedic.), common lambsquarters (Chenopodium albumL.), wild mustard [Brassica kaber(DC.) L. C. Wheeler var.pinnatifida(Stokes) L. C. Wheeler], soybean [Glycine max(L.) Merr. ‘Hodgson’], and redroot pigweed (Amaranthus retroflexusL.) in greenhouse and field studies following foliar applications of the alkanolamine (AKA) salt or the butoxyethanol (BE) ester of 2,4-D [(2,4-dichlorophenoxy)acetic acid] at rates that induced equivalent levels of phytotoxicity. Simulated rainfall less than 1 min after herbicide treatment reduced the phytotoxicity of the AKA salt of 2,4-D to a much greater extent than that of the BE ester with effects ranging from elimination of all injury from the AKA salt to soybeans to no reduction in phytotoxicity of the BE ester to common lambsquarters. The quantity of simulated rainfall required to induce maximum reductions in phytotoxicity of the BE ester ranged from 1 mm on common lambsquarters to 15 mm on velvetleaf. The time interval from 2,4-D treatment until rainfall required to achieve a phytotoxic response level of 80% of that attained without rainfall varied greatly among plant species and herbicide formulations; ranging from less than 1 min for the BE ester on common lambsquarters to more than 24 h for the AKA salt on velvetleaf. The addition of an alkylarylpolyoxyethylene glycol surfactant to 2,4-D spray solutions reduced herbicide rates required to induce equivalent levels of phytotoxicity, increased losses in phytotoxicity of the BE ester caused by rainfall, and reduced the time interval from treatment to rainfall required to attain an equivalent level of phytotoxicity with the AKA salt.

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