Evaluation of Soil-Applied Herbicides in Sequential Programs with CGA-277476 in Soybean (Glycine max)

1999 ◽  
Vol 13 (2) ◽  
pp. 271-275 ◽  
Author(s):  
Eric W. Palmer ◽  
David R. Shaw ◽  
J. C. Holloway
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Sequential Programs ◽  
Soybean Yield ◽  
Pitted Morningglory ◽  
Hemp Sesbania

Soil-applied herbicides alone or followed by postemergence (POST) applications of CGA-277476 were evaluated for season-long weed control in soybean. Common cocklebur, hemp sesbania, and pitted morningglory control was not consistently improved with a soil-applied herbicide followed by a POST application of 79 g ai/ha CGA-277476. However, in locations with heavy weed pressure, a tank-mix of chlorimuron + metribuzin + trifluralin or imazaquin + pendimethalin followed by CGA-277476 improved common cocklebur, hemp sesbania, and pitted morningglory over CGA-277476 alone. Sequential application of CGA-277476 following SAN 582 improved weed control over SAN 582 alone. When weed pressure was not severe, there were no differences in control from CGA-277476 alone or following soil-applied herbicides. A POST application of CGA-277476 following soil-applied herbicides did not consistently improve soybean yield over CGA-277476 alone. Yield from soybean treated with SAN 582 was improved when CGA-277476 was applied. In contrast, when chlorimuron + metribuzin + trifluralin or imazaquin + pendimethalin were applied at planting, yield was similar with or without POST application of CGA-277476.

Broadleaf Weed Control with Trifluralin Plus Flumetsulam in Soybean (Glycine max)

1995 ◽  
Vol 9 (3) ◽  
pp. 446-451 ◽  
Author(s):  
Daniel B. Reynolds ◽  
David L. Jordan ◽  
P. Roy Vidrine ◽  
James L. Griffin
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Soybean Yield ◽  
Pitted Morningglory ◽  
Hemp Sesbania ◽  
Herbicide Programs

In 12 trials in Louisiana, sicklepod, entireleaf morningglory, pitted morningglory, and hemp sesbania control 4 wk after planting was greater with trifluralin applied PPI followed by chlorimuron plus metribuzin applied PRE than with trifluralin plus flumetsulam applied PPI. Sicklepod control with these herbicides was similar 6 wk after application. No differences in soybean yield were noted. Chlorimuron applied POST following trifluralin applied PPI and metribuzin applied PRE or trifluralin plus flumetsulam applied PPI improved weed control and soybean yield compared with soil-applied herbicides alone. Excellent barnyardgrass control was obtained with all herbicide programs.

Weed Control with Non-Selective Herbicides in Soybean (Glycine max) Stale Seedbed Culture

1994 ◽  
Vol 8 (1) ◽  
pp. 159-164 ◽  
Author(s):  
Andrew J. Lanie ◽  
James L. Griffin ◽  
P. Roy Vidrine ◽  
Daniel B. Reynolds
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Soil Tillage ◽  
Herbicide Application ◽  
Soybean Yield ◽  
Hemp Sesbania ◽  
Prickly Sida ◽  
Control Post

Barnyardgrass and morningglory control POST with glufosinate at 840 g a.i./ha 28 d after treatment was 79 to 85% and 83 to 90%, respectively, when no more than 35 d elapsed between initial spring soil tillage and herbicide application. For the same rate of glufosinate, prickly sida and hemp sesbania were controlled 68 and 92%, respectively. Comparable barnyardgrass control was obtained with glufosinate at 560 and 840 g/ha, which was greater than at 420 g/ha. Hemp sesbania control was similar for all rates of glufosinate. In comparison, paraquat at 1050 g a.i./ha controlled 40 to 65% barnyardgrass, 44 to 75% morningglory, 41% prickly sida, and 92% hemp sesbania. With 840 g a.i./ha glyphosate and SC-0224, barnyardgrass, morningglory, prickly sida, and hemp sesbania were controlled 55 to 89%, 55 to 81%, 45 to 61%, and 56 to 68%, respectively. Soybean yield was 5.8, 7.6, 6.0, and 5.9 times greater than the nontreated check for 1050 g/ha paraquat and 840 g/ha glufosinate, glyphosate, and SC-0224, respectively.

Early Season Herbicide Applications for Weed Control in Stale Seedbed Soybean (Glycine max)

1992 ◽  
Vol 6 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Stacey A. Bruff ◽  
David R. Shaw
Keyword(s):  
Weed Control ◽  
Field Experiments ◽  
Sandy Loam ◽  
Control Measures ◽  
Silty Clay ◽  
Soybean Yield ◽  
Pitted Morningglory ◽  
Herbicide Treatments ◽  
Hemp Sesbania ◽  
Selective Herbicide

Field experiments were conducted in 1989 and 1990 on silty clay and sandy loam soils to evaluate weed control and soybean yield with early-April preplant incorporation of selective herbicides in stale seedbed soybean followed by non-selective weed control measures at planting. Metribuzin applied PPI early followed by chlorimuron POST coupled with either glyphosate or paraquat PRE controlled sicklepod, pitted morningglory, and hemp sesbania to the same extent of that treatment applied PPI at planting. All stale seedbed treatments with POST applications and glyphosate, paraquat, or tillage at planting controlled pitted morningglory over 70%. However, imazaquin or metribuzin applied PPI early without a POST treatment controlled sicklepod and pitted morningglory poorly. Frequently, applying PPI herbicides at planting increased control compared with early PPI applications, but this was overcome by POST treatments. Early stale seedbed applications of metribuzin did not result in more than 60% control of hemp sesbania, whereas metribuzin applied PPI at planting controlled over 85%. However, metribuzin plus chlorimuron controlled hemp sesbania at least 74%, regardless of application timing or tillage method, whereas no imazaquin treatment achieved over 65% control. All stale seedbed herbicide treatments increased soybean yield compared with the untreated stale seedbed check. Selective herbicide treatments with either non-selective herbicide in a stale seedbed program resulted in equivalent yield to PPI at planting treatments most often, except with metribuzin.

Improving Soybean (Glycine Max) Tolerance to AC 263,222 by Limiting Terminal Exposure

Weed Science ◽  
1994 ◽  
Vol 42 (4) ◽  
pp. 608-613 ◽  
Author(s):  
Larry J. Newsom ◽  
David R. Shaw
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Field Experiments ◽  
Soybean Yield ◽  
Herbicide Treatment ◽  
Pitted Morningglory ◽  
Ac 263,222

Field experiments were established to evaluate the effects of various band widths left open directly over the soybean row to improve soybean tolerance to AC 263,222 and chlorimuron applied POST, while maintaining weed control. Drop tubes with even fan tips extended below the spray boom to within 40 and 30 cm from the ground to obtain 5 and 10 cm open bands at the soybean terminals. AC 263,222 applied broadcast at 13, 18, and 36 g ai ha-1injured soybean 14, 16, and 32%, respectively, 3 DAT. AC 263,222 at 36 g ha-1applied with a 5-cm and 10-cm open band injured soybean 11 and 3%, respectively. Chlorimuron injury was 12% or less for all treatments. Metribuzin followed by AC 263,222 or chlorimuron was not more injurious to soybean than AC 263,222 or chlorimuron alone. Metribuzin PRE followed by 36 g ha-1AC 263,222 applied in a 10-cm open band controlled sicklepod and pitted morningglory 86 and 92%, respectively, 6 WAT. Sicklepod control was similar with open-band treatments compared to the same rate applied broadcast; however, 18 g ha-1AC 263,222 applied in a 10-cm open band provided less pitted morningglory control than the broadcast treatment. Soybean treated with herbicides in a band produced yields similar to or greater than soybean treated with the same herbicides broadcast. Metribuzin followed by 36 g ha-1AC 263,222 with a 10-cm open band resulted in a soybean yield of 2840 kg ha-1, which was greater than any other herbicide treatment and equivalent to the weed-free check.

Influence of Residual Herbicides on Rate of Paraquat and Glyphosate in Stale Seedbed Soybean (Glycine max)

1993 ◽  
Vol 7 (4) ◽  
pp. 960-965 ◽  
Author(s):  
Andrew J. Lanie ◽  
James L. Griffin ◽  
Daniel B. Reynolds ◽  
P. Roy Vidrine
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Field Studies ◽  
Soybean Yield ◽  
Herbicide Treatment ◽  
Herbicide Treatments ◽  
Hemp Sesbania ◽  
Prickly Sida ◽  
Residual Herbicide ◽  
Control Tank

Field studies were conducted to evaluate weed control with paraquat and glyphosate applied at various rates alone and in combination with residual herbicides. Morningglory, prickly sida, and hemp sesbania control 28 d after treatment was similar regardless of herbicide treatment. In contrast, barnyardgrass control when paraquat was tank mixed with pendimethalin plus imazaquin was equal to that of paraquat alone but less than that for tank mixtures with metolachlor plus metribuzin plus chlorimuron or metolachlor plus metribuzin. Barnyardgrass control and soybean yield when paraquat was applied at 1050 g ai/ha in combination with metolachlor plus metribuzin plus chlorimuron or metolachlor plus metribuzin was greater than when the same residual herbicide treatments were applied with paraquat at 350 g/ha. Yield following glyphosate at 840 and 1120 g ai/ha in combination with residual herbicides was no greater than when glyphosate was applied alone, which was reflective of barnyardgrass control. Tank mixtures of glyphosate at 1680 g/ha with metolachlor plus metribuzin plus chlorimuron or metolachlor plus metribuzin resulted in soybean yield higher than for glyphosate alone. Regardless of the glyphosate and residual herbicide combination, soybean yield was no greater than when paraquat was applied at 350 g/ha in combination with metolachlor plus metribuzin plus chlorimuron.

Evaluation of Weed Control and Crop Tolerance with Co-application of Glyphosate and Pyraflufen-ethyl in Glyphosate-resistant Soybean (Glycine Max)

2006 ◽  
Vol 20 (4) ◽  
pp. 1035-1039 ◽  
Author(s):  
Derek M. Scroggs ◽  
Donnie K. Miller ◽  
Paul R. Vidrine ◽  
Robert G. Downer
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Reduction Potential ◽  
Control Program ◽  
Field Trials ◽  
Yield Reduction ◽  
Soybean Yield ◽  
Crop Tolerance ◽  
Affect Control ◽  
Pitted Morningglory

Field trials were conducted to evaluate weed control and soybean tolerance with co-application of pyraflufen-ethyl and glyphosate. Pyraflufen-ethyl applied at 11, 23, or 45 g ai/ha in combination with glyphosate did not affect control of barnyardgrass, browntop millet, redroot pigweed, sicklepod, or smellmelon compared to glyphosate alone or co-applied with chlorimuron. Initial benefit (7 DAT) to pitted morningglory control with pyraflufen-ethyl plus glyphosate compared to glyphosate alone or co-applied with chlorimuron was not observed 28 DAT. Hemp sesbania control was increased by pyraflufen-ethyl at 45 g/ha plus glyphosate and glyphosate plus chlorimuron relative to glyphosate applied alone. Pyraflufen-ethyl plus glyphosate resulted in significant visual soybean injury, and a reduction in soybean yield was observed with pyraflufen-ethyl at 45 g/ha relative to glyphosate applied alone or in combination with chlorimuron. Results from a weed-free study confirmed crop injury and yield reduction potential with pyraflufen-ethyl plus glyphosate. Overall results suggest no benefit with respect to weed control or crop tolerance to pyraflufen-ethyl inclusion in a glyphosate-resistant soybean weed control program over that observed with currently registered co-application of glyphosate and chlorimuron.

Tank-mix Combinations for Weed Control in Stale Seedbed Soybean (Glycine max)

1992 ◽  
Vol 6 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Stacey A. Bruff ◽  
David R. Shaw
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Field Experiments ◽  
Sandy Loam ◽  
Conventional Tillage ◽  
Control Measures ◽  
Silty Clay ◽  
Soybean Production ◽  
Pitted Morningglory ◽  
Hemp Sesbania

Field experiments were established in 1989 and 1990 on silty clay and sandy loam soils to evaluate selective herbicides in combination with non-selective weed control measures in conventional and stale seedbed soybean production. Metribuzin PRE followed by chlorimuron POST controlled sicklepod better with paraquat than with glyphosate. A POST application of imazaquin increased sicklepod and pitted morningglory control by imazaquin PRE alone in a stale seedbed or tillage program. Pitted morningglory control with imazaquin PRE was lower with tillage than with glyphosate or paraquat combinations in a stale seedbed program. All metribuzin plus chlorimuron PRE treatments, whether conventional tillage or stale seedbed, controlled pitted morningglory more than 75%. Hemp sesbania control was above 80% with all metribuzin followed by chlorimuron or metribuzin plus chlorimuron PRE combinations, and less than 70% with all treatments containing imazaquin. Selective herbicides increased yield in stale seedbed when glyphosate or paraquat was added. Imazaquin PRE, imazaquin PRE followed by imazaquin POST, and metribuzin PRE followed by chlorimuron POST tank mixed with glyphosate or paraquat in a stale seedbed program increased yield compared with the same treatments used with tillage.

Herbicide Systems in Stale Seedbed Soybean (Glycine max) Production

1993 ◽  
Vol 7 (4) ◽  
pp. 816-823 ◽  
Author(s):  
Lawrence R. Oliver ◽  
Tracy E. Klingaman ◽  
Marilyn McClelland ◽  
Robert C. Bozsa
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Field Experiments ◽  
Growing Season ◽  
Application Time ◽  
Herbicide Application ◽  
Soybean Yield ◽  
Pitted Morningglory ◽  
Herbicide Activity ◽  
Better Than

Field experiments were conducted using a stale seedbed production system to determine the effect of herbicide application time on preplant, preplant incorporated (PPI), and at-planting treatments on weed control and soybean yield. Herbicides were applied on the surface preplant (PPL) or PPI at 6 to 7, 4 to 5, and 2 to 3 wk before planting and just prior to planting. The differences in weed control and soybean yield among years were due to rainfall patterns 2 wk after herbicide application and during the growing season. Preplant treatments applied 2 to 5 wk before planting generally controlled common cocklebur and pitted morningglory better than preplant treatments applied 6 to 7 wk before planting due to persistence of herbicide activity or treatments at planting due to a greater chance of obtaining adequate rainfall for herbicide activation, more uniform seedbed at planting, and larger weeds at application. Metribuzin plus chlorimuron was less suited than imazaquin as a preplant treatment when applied more than 2 weeks before planting.

Cultivation Enhances Weed Control in Soybean (Glycine max) with AC 263,222

1996 ◽  
Vol 10 (3) ◽  
pp. 502-507 ◽  
Author(s):  
Larry J. Newsom ◽  
David R. Shaw
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Soybean Yield ◽  
Pitted Morningglory ◽  
Ac 263,222

Cultivations in conjunction with POST applications of AC 263,222 were evaluated for their effects on sicklepod and pitted morningglory control and soybean yield. Cultivation alone controlled sicklepod and pitted morningglory season-long no more than 30%. In most instances, one cultivation with herbicides improved sicklepod and pitted morningglory control compared with no cultivation, but two cultivations did not further improve control. Two applications of AC 263,222 at 9 or 13 g ai/ha per application with a single cultivation caused the most soybean injury and were no more efficacious than imazaquin applied PRE followed by 9 g/ha AC 263,222. Imazaquin applied PRE followed by AC 263,222 at 18 g/ha plus one or two cultivations were the only treatments that controlled sicklepod and pitted morningglory more than 90% season-long. Cultivation in combination with herbicides increased yields over that of herbicides used alone. Soybean yield was the highest following imazaquin applied PRE followed by AC 263,222 at 9 g/ha plus two cultivations.

Soybean (Glycine max) Response to Thifensulfuron and Bentazon Combinations

1998 ◽  
Vol 12 (1) ◽  
pp. 179-184 ◽  
Author(s):  
Stephen E. Hart ◽  
Gordon K. Roskamp
Keyword(s):  
Glycine Max ◽  
Grain Yield ◽  
Weed Control ◽  
Field Studies ◽  
Soybean Yield

Field studies were conducted in 1995 and 1996 at three locations in Illinois to determine soybean response to combinations of thifensulfuron and bentazon. Thifensulfuron was applied at 2.2 to 8.8 g ai/ha alone or in combination with 280 to 560 g/ha of bentazon. Soybean injury 30 d after treatment ranged from 0 to 22% when thifensulfuron was applied alone at 2.2 g/ha. Increasing thifensulfuron rate to 8.8 g/ha increased soybean injury to a range of 12 to 44%. Soybean grain yield was significantly reduced compared to the yield of untreated soybean when thifensulfuron was applied at 4.4 and 8.8 g/ha in two of five and four of five experiments, respectively. The addition of bentazon to thifensulfuron consistently reduced soybean injury and stunting. In many cases, increasing the bentazon rate to 420 g/ha decreased soybean injury from thifensulfuron to a greater extent than 280 g/ha. In cases where thifensulfuron decreased soybean yield, the addition of 420 or 560 g/ha of bentazon restored yields to levels that were not lower than untreated soybeans. These studies demonstrate that thifensulfuron at 2.2 to 8.8 g/ha in combination with bentazon at 420 g/ha may be safely applied to soybean for broadleaf weed control.

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