Glyphosate-resistant Horseweed (Conyza canadensis) Control Using Glyphosate-, Paraquat-, and Glufosinate-Based Herbicide Programs

  title={Glyphosate-resistant Horseweed (Conyza canadensis) Control Using Glyphosate-, Paraquat-, and Glufosinate-Based Herbicide Programs},
  author={Thomas W. Eubank and Daniel Poston and Vijay K. Nandula and Clifford H. Koger and David R. Shaw and Daniel B. Reynolds},
  booktitle={Weed Technology},
Field studies were conducted in 2005 and 2006 to determine the most effective chemical options within three individual herbicide-based burndown programs, glyphosate, paraquat and glufosinate, for controlling glyphosate-resistant horseweed in Mississippi. Burndown treatments were applied April 5, 2005 and March 15, 2006 to horseweed plants 15 to 30 cm in height. Glyphosate at 0.86 kg ae/ha alone provided 60 to 65% horseweed control 4 wk after treatment (WAT). Control 4 WAT ranged from 73 to 74… 

Strategies for Control of Horseweed (Conyza canadensis) and Other Winter Annual Weeds in No-Till Corn

Mixtures of paraquat plus acetochlor improved control of horseweed and yellow woodsorrel over control with either herbicide applied alone or in combinations with other corn herbicides.

Strategies to improve the control of glyphosate-resistant horseweed (Erigeron canadensis) with glufosinate applied preplant to soybean

Abstract The objectives of this study were to determine if the level and consistency of glyphosate-resistant (GR) horseweed control prior to soybean planting can be improved by (i) adding

Control of Glyphosate-Resistant Horseweed (Conyza canadensis) with Dicamba Applied Preplant and Postemergence in Dicamba-Resistant Soybean

This technology provides a much-needed POST option of dicamba to be applied as a rescue treatment to control weed escapes caused by late emergence or poor initial control following a PP herbicide application.

Herbicide Programs Utilizing Halauxifen-Methyl for Glyphosate-Resistant Horseweed (Conyza canadensis) Control in Soybean

Halauxifen-methyl is a new synthetic auxin herbicide for broadleaf weed control in preplant burndown applications for soybean and other crops at low use rates and no herbicide injury or soybean yield reduction was observed for treatments containing halauxifens-methyl.

Influence of Plant Height and Glyphosate on Saflufenacil Efficacy on Glyphosate-Resistant Horseweed (Conyza canadensis)

Control of horseweed with glyphosate applied alone was less than 30%, confirming the presence of glyphosate-resistant plants, and the efficacy compared to paraquat at 840 g ai ha−1 and the addition of glyphosate to saflufenacil further reduced the frequency of horse weed regrowth.

Glyphosate-Resistant Horseweed (Conyza canadensis) Dose Response to Saflufenacil, Saflufenacil plus Glyphosate, and Metribuzin plus Saflufenacil plus Glyphosate in Soybean

The addition of metribuzin with the recommended rate of saflufenacil plus glyphosate improved control and a second effective herbicide mode of action for the control of GR horseweed.

Integrated management of glyphosate-resistant horseweed (Erigeron canadensis) with tillage and herbicides in soybean

Tillage or herbicide applied in fall or spring provided similar horseweed control and soybean yield when followed by a PRE, POST, or PRE and POST herbicide; therefore, fall- or spring-applied herbicides can be rotated with shallow tillage for integrated season-long horseweed management.

Control of Glyphosate-Resistant Marestail in Identity-Preserved or Glyphosate-Resistant and Glyphosate/Dicamba-Resistant Soybean with Preplant Herbicides

Two studies, each consisting of six field experiments were conducted in growers’ fields in 2018 and 2019 to determine the optimal herbicide tankmixes, applied preplant (PP) for the control of

Glyphosate Resistance in Sonchus oleraceus and Alternative Herbicide Options for Its Control in Southeast Australia

Glufosinate and paraquat were the most effective herbicides for S. oleraceus control, resulting in no seedling survival for both biotypes, suggesting that growers will need to reduce over-reliance on glyphosate for weed control in summer fallows and use alternative post-emergence herbicides.

Biologically effective dose of bromoxynil applied alone and mixed with metribuzin for the control of glyphosate-resistant horseweed in soybean

Abstract Glyphosate-resistant (GR) horseweed was first confirmed in Ontario in 2010. GR horseweed interference can reduce soybean yield by up to 97%. Bromoxynil is a photosystem II–inhibiting



Glyphosate-Resistant Horseweed (Conyza canadensis) in Mississippi1

It is demonstrated that the difficult-to-control biotypes were resistant to glyphosate, that resistant biotypes could survive glyphosate rates of up to 6.72 kg/ha, and that plant size affected both resistant and susceptible biotypes in a similar manner.

Shikimate accumulates in both glyphosate-sensitive and glyphosate-resistant horseweed (Conyza canadensis L. Cronq.).

This direct comparison conclusively confirms that horseweed plants collected in western Tennessee in 2002 are resistant to 4 times the normal application dosage of glyphosate, implying that alternative control strategies for glyphosate-resistant horseweed will be needed in those no-tillage production systems where it commonly occurs.

Horseweed (Conyza canadensis) control in no-tillage soybeans (Glycine max) with preplant and preemergence herbicides.

Research was conducted in 1987 and 1988 to identify effective horseweed control strategies in no-tillage soybean production. Paraquat at 560 g ai ha-1 plus metolachlor at 2200 g ai ha-1, linuron at

Glyphosate in Double-Crop No-Till Glyphosate-Resistant Soybean: Role of Preplant Applications and Residual Herbicides1

Glyphosate alone or with clomazone plus imazethapyr provided excellent control of horseweed and fall panicum irrespective of the time of herbicide application from GRS at cracking to the V6 stage.

Response of Horseweed Biotypes to Foliar Applications of Cloransulam-methyl and Glyphosate1

Results of these studies indicate that, in 2002, ALS-resistant horseweed was widespread throughout Ohio, whereas resistance to glyphosate occurred primarily in several counties in southwestern Ohio.

Residual Herbicides used in Combination with Glyphosate and Glufosinate in Corn (Zea mays)1

R residual herbicides used in combination with glyphosate, when compared with glyphosate alone, increased control of redroot pigweed and common lambsquarters by an average of 20% and resulted in a 4 to 19% increase in control of giant foxtail.

Combinations of nonselective herbicides for difficult to control weeds in no-till corn, Zea mays, and soyabeans, Glycine max.

The combination of glyphosate and 2,4-D at various rates was evaluated for controlling existing weeds at planting in no-till corn and soybeans. Herbicide combinations in soybeans also included

Glufosinate Efficacy on Annual Weeds Is Influenced by Rate and Growth Stage

Control with glufosinate at 420 or 560 g/ha was most effective when applied at the 10-cm Weed height compared either to the 5- or 15-cm weed height, and common lambsquarters was the most tolerant species evaluated and was not consistently controlled acceptably.

Glyphosate tank mixtures with SAN 582 for burndown or postemergence applications in glyphosate-tolerant soybean (Glycine max)

Tank mixtures of SAN 582 with glyphosate controlled late-season flushes of barnyardgrass through residual activity of theSAN 582 and improved soybean yield 500 kg/ha over glyphosate applied alone.

Response of paraquat-resistant and -susceptible horseweed (Conyza canadensis) to diquat, linuron, and oxyfluorfen

A paraquat-resistant horseweed population in an Ontario orchard that was being managed by a rotation of herbicides began to show increased tolerance to the herbicide linuron, and the response to oxyfluorfen was age dependent.