Herbicide Systems for Golden Crownbeard (Verbesina encelioides) Control in Peanut1

2000 ◽  
Vol 27 (1) ◽  
pp. 23-26 ◽  
Author(s):  
W. J. Grichar ◽  
D. C. Sestak
Keyword(s):  
Field Studies ◽  
South Texas ◽  
Combination Treatments ◽  
Untreated Check ◽  
Verbesina Encelioides ◽  
Postemergence Herbicides

Abstract Field studies were conducted in south Texas in 1994 and 1995 to evaluate various soil-applied herbicides alone and in combination with postemergence herbicides for golden crownbeard control. Ethalfluralin preplant incorporated (PPI) followed by imazapic or lactofen postemergence (POST) provided 100% golden crownbeard control. Ethalfluralin PPI followed by oxyfluorfen applied preemergence (PRE) or metolachlor + imazethapyr provided 90% control. Dimethenamid, ethalfluralin, and metolachlor alone failed to adequately control golden crownbeard. Golden crownbeard control was most effective when combination treatments were used (PPI or PRE followed by POST). Effective golden crownbeard control increased peanut yields up to 53% over that of the untreated check.

scholarly journals Castor (Ricinus communisL.) Tolerance to Postemergence Herbicides and Weed Control Efficacy

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
W. James Grichar ◽  
Peter A. Dotray ◽  
Calvin L. Trostle
Keyword(s):  
Weed Control ◽  
Cucumis Melo ◽  
Field Studies ◽  
Control Efficacy ◽  
Untreated Check ◽  
Postemergence Herbicides

Potential US castor production is limited due to only one labeled herbicide (trifluralin). Field studies were conducted at two Texas locations during 2008 and 2009 to evaluate postemergence herbicides for castor tolerance and weed control efficacy. Clethodim and fluazifop-P-butyl caused no castor stunting while acifluorfen, bentazon, imazethapyr, and lactofen caused stunting which ranged from 5 to 46%. Imazapic and 2,4-DB caused the greatest stunting (44 to 99%) and resulted in castor yields of 0 to 45% of the untreated check. Acifluorfen, imazapic, imazethapyr, lactofen, and 2,4-DB controlled at least 80% smellmelon (Cucumis meloL. var. Dudaim Naud.) while clethodim and fluazifop-P-butyl controlled at least 98% Texas millet [Urochloa texana(Buckl.) R.Webster]. Imazapic and imazethapyr provided 57 to 75% Texas millet control. Results suggest that castor tolerance to the graminicides, clethodim, and fluazifop-P-butyl is high; however, castor injury and yield reductions with the postemergence applications of broadleaf herbicides suggest that these herbicides should not be used in castor production.

Use of Azoxystrobin for Disease Control in Texas Peanut

2000 ◽  
Vol 27 (2) ◽  
pp. 83-87 ◽  
Author(s):  
W. J. Grichar ◽  
B. A. Besler ◽  
A. J. Jaks
Keyword(s):  
Disease Control ◽  
Rhizoctonia Solani ◽  
Leaf Spot ◽  
Sclerotium Rolfsii ◽  
Field Studies ◽  
South Texas ◽  
Stem Rot ◽  
Cercospora Arachidicola ◽  
Late Leaf Spot ◽  
Untreated Check

Abstract Field studies were conducted at 11 locations across south Texas from 1994 to 1997 to determine the activity of azoxystrobin against southern stem rot (Sclerotium rolfsii Sacc.), Rhizoctonia pod rot (Rhizoctonia solani Kuhn), early leaf spot (Cercospora arachidicola Hori) and late leaf spot [Cercosporidium personatum (Berk. & Curt.) Deighton]. Azoxystrobin at 0.22 to 0.45 kg/ha applied twice provided control of stem rot, Rhizoctonia pod rot, and leaf spot comparable to tebuconazole at 0.2 kg/ha applied four times. Peanut yield increases were evident with all fungicide treatments over the untreated check.

Response of Three Annual Medic Species to Postemergence Herbicides

2009 ◽  
Vol 23 (3) ◽  
pp. 412-415 ◽  
Author(s):  
W. James Grichar ◽  
W. R. Ocumpaugh
Keyword(s):  
Dry Matter ◽  
Dry Weight ◽  
Field Studies ◽  
Barrel Medic ◽  
Weight Yield ◽  
Untreated Check ◽  
Annual Medics ◽  
Postemergence Herbicides

Field studies were conducted from 2004 to 2006 to evaluate the tolerance of three annual medic species (bur, black, and barrel medic) to selected POST herbicides. 2,4-DB at 0.56 and 1.12 kg/ha caused the most stunting across all three species. Imazethapyr at 0.1 kg/ha stunted all three annual medics in 1 of 3 yr whereas flumetsulam at 0.04 kg/ha stunted black and barrel medics in 1 of 3 yr. Clethodim at 0.28 kg/ha did not cause any medic stunting. Imazethapyr, imazamox, and 2,4-DB at 0.56 kg/ha reduced henbit dry matter composition compared to the untreated check whereas clethodim, flumetsulam, and 2,4-DB at 1.12 kg/ha did not. In 2004, 2,4-DB at 1.12 kg/ha reduced dry weight yield of bur and barrel medic but not black medic when compared with the untreated check. Black medic treated with imazethapyr at 0.05 and 0.1 kg/ha and clethodim at 0.28 kg/ha produced higher dry weight yield than the untreated check. In 2006, both rates of 2,4-DB and flumetsulam at 0.04 kg/ha reduced dry weight yield of bur medic compared to the untreated check. Barrel medic dry weight yields were reduced by both rates of 2,4-DB and flumetsulam compared to untreated check. No herbicides reduced dry weight yields of black medic.

Control of Golden Crownbeard (Verbesina encelioides) in Peanut (Arachis hypogaea) with Postemergence Herbicides1

1998 ◽  
Vol 25 (1) ◽  
pp. 39-43 ◽  
Author(s):  
W. J. Grichar ◽  
D. C. Sestak
Keyword(s):  
Arachis Hypogaea ◽  
Field Experiments ◽  
South Texas ◽  
Verbesina Encelioides ◽  
Postemergence Herbicides

Abstract Field experiments at five South Texas locations from 1992 to 1995 evaluated eight postemergence herbicides alone or in combination for golden crownbeard control and peanut yield. Imazapic provided inconsistent golden crownbeard control regardless of rate. Bentazon and 2,4-DB alone controlled ≥ 90% golden crownbeard while acifluorfen at 0.42 kg/ha and pyridate provided ≥ 80% control. Bromoxynil and imazethapyr alone or acifluorfen plus bentazon provided inconsistent golden crownbeard control.

Spring Wheat (Triticum aestivum)Cultivar Responses to Trifluralin and Postemergence Herbicides

1995 ◽  
Vol 9 (2) ◽  
pp. 352-355 ◽  
Author(s):  
Sharon A. Clay ◽  
Jim F. Gaffney ◽  
Leon J. Wrage
Keyword(s):  
Spring Wheat ◽  
Plant Stress ◽  
Dry Weight ◽  
Field Studies ◽  
Growth And Yield ◽  
Hard Red Spring Wheat ◽  
Wheat Field ◽  
Shoot Dry Weight ◽  
Cultivar Responses ◽  
Postemergence Herbicides

Trifluralin is used for weed control in wheat but may reduce vegetative growth and yield. Postemergence (POST) herbicides may cause additional plant stress to trifluralin-stressed wheat. Field studies at Groton, SD in 1991 and 1992 and at Highmore, SD in 1992 evaluated the effects of 2,4-D-amine, difenzoquat, metsulfuron, and a combination of fenoxaprop-ethyl + 2,4-D-ester + MCPA-ester on hard red spring wheat cultivars ‘2375,’ ‘Prospect,’ and ‘Butte 86’ seeded in areas treated with preplant incorporated trifluralin either in the spring before seeding (0.56 kg ai/ha) or the previous year (1.12 or 2.24 kg ai/ha). Trifluralin applied alone in the spring, and followed by some POST herbicides, reduced shoot dry weight and grain yield. Trifluralin reduced the yield of Prospect the most and the yield of 2375 the least. Yields of trifluralin-treated wheat were reduced 23% by metsulfuron and 14% by fenoxaprop-ethyl + 2,4-D + MCPA compared to yields of wheat treated with only the respective POST herbicide. Yields were not reduced with any trifluralin-POST herbicide combination when trifluralin was applied a year prior to seeding wheat.

Hemp Dogbane (Apocynum cannabinum) Control in Corn (Zea mays) with Selective Postemergence Herbicides

1998 ◽  
Vol 12 (4) ◽  
pp. 631-637 ◽  
Author(s):  
Corey V. Ransom ◽  
James J. Kells
Keyword(s):  
Zea Mays ◽  
Field Studies ◽  
No Tillage ◽  
Herbicide Application ◽  
Time Of Application ◽  
Postemergence Herbicides ◽  
Shoot Emergence

Field studies were conducted from 1994 to 1996 in Michigan to evaluate postemergence (POST) herbicides for hemp dogbane control in corn. Studies were initiated at no-tillage and chisel-plowed sites each of the three years. Nicosulfuron and primisulfuron were evaluated alone and in combination with 2,4-D amine or dicamba. In 1995 and 1996, CGA-152005 plus primisulfuron was also applied alone and in combination with 2,4-D or dicamba. Control varied among years and sites. Nicosulfuron, primisulfuron, and CGA-152005 plus primisulfuron applied alone controlled 30% of the hemp dogbane, and dicamba or 2,4-D alone controlled 42 and 66%, respectively. Tank mixtures of nicosulfuron, primisulfuron, or CGA-152005 plus primisulfuron with dicamba were more effective and more consistent than dicamba alone. Combinations of nicosulfuron, primisulfuron, or CGA-152005 plus primisulfuron with 2,4-D gave the most effective and consistent control across sites, with an average of 93% control. In general, treatments controlled only shoots that had emerged at the time of application. New shoots emerged following herbicide application at the chisel-tillage sites in 1994 and 1995 but not at the no-tillage sites. However, in 1996, shoot emergence following treatment occurred in both no-tillage and chisel-tillage sites.

scholarly journals Evaluation of Synthetic Pyrethroids, Bidrin, and Fipronil for Control of Tarnished Plant Bug, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 245-246
Author(s):  
T. G. Teague ◽  
N. P. Tugwell
Keyword(s):  
Field Studies ◽  
Synthetic Pyrethroids ◽  
Tarnished Plant Bug ◽  
Late Season ◽  
Experiment Station ◽  
Untreated Check

Abstract Field studies were conducted at the Cotton Branch Experiment Station in Marianna, AR to evaluate the late-season control of TPB. Cotton was planted 12 May in 8-row (38-inch centers) wide by 70-ft-long plots with 10-ft alleys and separated by a 6.5-ft non-planted buffer. The treatments were arranged in a RCBD with 4 replications. The insecticides were applied 14 Aug using a 8-row CO2-charged hi-boy sprayer calibrated to deliver 9.5 gpa at 30 psi with TJ-60 8002 VS nozzles on 19-inch spacing. The numbers of TPB nymphs and adults per plot were estimated 4 DAT using 24 sweeps with one 18-inch net. Numbers of TPB 4 DAT were significantly reduced in all plots sprayed with insecticides compared with the untreated check. Control with the CS formu-lation of Karate was reduced compared with the EC formulation.

scholarly journals Response of Sesame to Selected Herbicides Applied Early in the Growing Season

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
W. James Grichar ◽  
Jack J. Rose ◽  
Peter A. Dotray ◽  
Todd A. Baughman ◽  
D. Ray Langham ◽  
...  
Keyword(s):  
No Reduction ◽  
Field Studies ◽  
Yield Reduction ◽  
Early Season ◽  
Application Timing ◽  
Late Season ◽  
Growing Seasons ◽  
Leaf Chlorosis ◽  
Untreated Check ◽  
Dinitroaniline Herbicides

Growth chamber experiments were conducted to evaluate the response of sesame to PRE and POST applications of soil residual herbicides. PRE applications of acetochlor andS-metolachlor at 1.26 and 1.43 kg ai·ha−1showed little or no sesame injury (0 to 1%) 4 wks after herbicide treatments (WAT). POST treatments of acetochlor and trifluralin made 3 wks after planting (WAP) resulted in greater sesame injury (40%) compared to applications at bloom (18%). Field studies were conducted in Texas and Oklahoma during the 2014 and 2015 growing seasons to determine sesame response to clethodim, diuron, fluometuron, ethalfluralin, quizalofop-P, pendimethalin, pyroxasulfone, trifluralin, and trifloxysulfuron-sodium applied 2, 3, or 4 weeks after planting (WAP). Late-season sesame injury with the dinitroaniline herbicides consisted of a proliferation of primary branching at the upper nodes of the sesame plant (in the shape/form of a broom). Ethalfluralin and trifluralin caused more “brooming” effect than pendimethalin. Some yield reductions were noted with the dinitroaniline herbicides. Trifloxysulfuron-sodium caused the greatest injury (up to 97%) and resulted in yield reductions from the untreated check. Early-season diuron injury (leaf chlorosis and necrosis) decreased as application timing was delayed, and late-season injury was virtually nonexistent with only slight chlorosis (<4%) still apparent on the lower leaves. Sesame yield was not consistently affected by the diuron treatments. Fluometuron caused early-season injury (stunting/chlorosis), and a reduction of yield was observed at one location. Pyroxasulfone applied 2 WAP caused up to 25% sesame injury (stunting) but did not result in a yield reduction. Quizalofop-P caused slight injury (<5%) and no reduction in yield.

Influence of Herbicides and Timing of Application on Broadleaf Weed Control in Peanut (Arachis hypogaea)

1997 ◽  
Vol 11 (4) ◽  
pp. 708-713 ◽  
Author(s):  
W. James Grichar
Keyword(s):  
Weed Control ◽  
Arachis Hypogaea ◽  
Field Studies ◽  
Application Timing ◽  
Pitted Morningglory ◽  
Untreated Check ◽  
Ac 263,222

Field studies were conducted from 1992 through 1994 to evaluate application timing of seven postemergence (POST) broadleaf herbicides alone and in mixtures for control of eclipta and pitted morningglory. Imazethapyr and 2,4-DB did not control eclipta while AC 263,222 applied early postemergence (EPOST) at 0.07 kg/ha provided greater than 90% control in 2 of 3 yr. EPOST applications of bentazon, acifluorfen + bentazon, and pyridate controlled eclipta at least 92% all 3 yr. Lactofen applied EPOST at 0.28 kg/ha provided similar levels of eclipta control in 2 of 3 yr. Imazethapyr controlled pitted morningglory > 70% when applied EPOST. AC 263,222 controlled pitted morningglory a minimum of 83% when applied EPOST at 0.04 or 0.07 kg/ha. Pitted morningglory control was at least 85% with 2,4-DB applied alone or in a mixture with AC 263,222, acifluorfen, imazethapyr, lactofen, or pyridate. Effective weed control increased peanut yields up to 98% over the untreated check.

Herbicide-Resistant Canola (Brassica napus) Response and Weed Control with Postemergence Herbicides

2006 ◽  
Vol 20 (3) ◽  
pp. 551-557 ◽  
Author(s):  
Timothy L. Grey ◽  
Paul L. Raymer ◽  
David C. Bridges
Keyword(s):  
Weed Control ◽  
Field Studies ◽  
Italian Ryegrass ◽  
Wild Radish ◽  
Application Timing ◽  
Herbicide Resistant ◽  
Naturally Occurring ◽  
And Control ◽  
Postemergence Herbicides ◽  
Significant Injury

Field studies were conducted to evaluate weed control in herbicide-resistant canola in Georgia. The resistant canola cultivars and respective herbicides were ‘Pioneer 45A76’ and imazamox, ‘Hyola 357RR’ and glyphosate, and ‘2573 Invigor’ and glufosinate. Weed seed of Italian ryegrass and wild radish were sown simultaneously in October with canola and control of these species was evaluated along with other naturally occurring weeds. Herbicide treatments for the respective herbicide-resistant canola cultivar were imazamox at 0.035 and 0.071 kg ai/ha, glyphosate at 0.84 and 1.64 kg ae/ha, and glufosinate at 0.5 and 1.0 kg ai/ha. Herbicides were applied at one– two-leaf (LF) and three–four-LF canola stages. There was no significant injury to any canola cultivar as a result of herbicide rate or timing of application. By midseason (February), imazamox effectively controlled wild radish, henbit, and shepherd's-purse at both rates and at both timings. When applied to three–four-LF canola, the higher rates of glyphosate and glufosinate were required to provide 75% or greater control of Italian ryegrass, wild garlic, and henbit. Glufosinate did not adequately control wild radish at either rate or application timing. Greenhouse experiments provided similar results.

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