Weed Control in Soybeans (<i>Glycine max</i>) with Reduced Rates of Postemergence Herbicides

Defelice, Michael S.; Brown, William; Aldrich, Richard J.; Sims, Barry D.; Judy, Dan T.; Guethle, David R.

doi:10.1017/s0043174500072076

Cited by 111 publications

(113 citation statements)

References 15 publications

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“…In field experiments, dicamba, triclopyr, and other herbicides required greater use rates to control the R biotype when plants were ,10 cm tall with multiple (.4) branches, compared with seedlings treated before branching (McCullough, personal observation). Reduced control from herbicides applied to mature weeds has been reported for common cocklebur (Xanthium strumarium L.), pitted morningglory (Ipomoea lacunosa L.), smooth pigweed (Amaranthus hybridus L.), and other annual weeds (Barrentine 1989;DeFelice et al 1989;Klingman et al 1992). Furthermore, mature weeds may have produced viable seed that could further spread resistant populations after control.…”

Section: Resultsmentioning

confidence: 99%

ALS-Resistant Spotted Spurge (Chamaesyce maculata) Confirmed in Georgia

McCullough

McElroy

et al. 2016

Weed sci.

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Metsulfuron is used for POST control of spotted spurge in many warm-season turfgrasses. A suspected resistant (R) biotype of spotted spurge was collected from turfgrass in Georgia with a history of exclusive metsulfuron use. Research was conducted to evaluate the resistance level of this biotype to metsulfuron, efficacy of other mechanisms of action for control, and the molecular basis for resistance. Compared with a susceptible (S) biotype, the R biotype required .90 and .135 times greater metsulfuron rates to reach 50% injury and reduce biomass 50% from the nontreated, respectively. The R biotype was also resistant to trifloxysulfuron but was injured equivalent to the S biotype from dicamba, glyphosate, and triclopyr. Gene sequencing of the R biotype revealed a Trp 574 to Leu substitution that has conferred resistance to acetolactate synthase (ALS) inhibitors in previous research. This is the first report of ALS resistance in spotted spurge. More importantly, this is the first report of a herbicide-resistant broadleaf weed from a turfgrass system in the United States. Nomenclature: Metsulfuron-methyl; spotted spurge, Chamaesyce maculata (L.) Small.

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Section: Resultsmentioning

confidence: 99%

ALS-Resistant Spotted Spurge (Chamaesyce maculata) Confirmed in Georgia

McCullough

McElroy

et al. 2016

Weed sci.

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“…In this study four chemical herbicides, chlorimuron, imazaquin, imazethapyr and MSMA, were chosen that are widely used to control common cocklebur in various geographical areas 27–30, 32, 33. They were used as commercial formulations: chlorimuron 250 g kg −1 DG (CLASSIC ® , DuPont), imazaquin 700 g kg −1 DG (Scepter ® , American Cyanamid), imazethapyr 700 g kg −1 DG (Pursuit ® , American Cyanamid) and MSMA 510 g liter −1 SL (Luxembourg & ISK Biosciences).…”

Section: Methodsmentioning

confidence: 99%

“…However, the efficacy of conventional herbicides and A helianthi has not been previously evaluated on MSC. Therefore, in the present study, we compared the response of MSC with that of normal common cocklebur (NCC) varieties to the mycoherbicide agent A helianthi 25 and to several conventional herbicides which are known to control the latter27–30 in various geographical areas.…”

Section: Introductionmentioning

confidence: 99%

Response of multiple seeded cocklebur and other cocklebur types to herbicide treatment

Abbas

Johnson

Pantone

et al. 2005

Pest Management Science

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Multiple seeded cocklebur has been found in the last decade in Texas, and described as a biotype of Xanthium strumarium L with up to 25 seeds per bur instead of the usual two. The multiple seeded bur typically produces up to nine seedlings, causing concern that it may be harder to control than normal seeded common cocklebur. The efficacies of a series of fungal and conventional commercial herbicides have been compared in the greenhouse on seedlings of multiple seeded cocklebur from Texas (MSC-TX) and normal common cockleburs from Texas (NCC-TX), Arkansas (NCC-AR), Illinois (NCC-ILL) and two from Mississippi (NCC-MS#1, NCC-MS#2). Three measures of herbicidal activity (reductions in plant height and dry weight, and mortality) were used. The fungal herbicide Alternaria helianthi (Hansf) Tubaki & Nishihara at 1 x 10(5) conidia ml(-1) + 2 g liter(-1) Silwet L-77 with an 8-h dew period was an effective herbicide with all biotypes, as were the commercial chemical herbicides chlorimuron (14.8 g ha(-1)), imazaquin (29.6 g ha(-1)), sodium hydrogen methylarsonate (MSMA; 279.1 g ha(-1)) and imazethapyr (39.5 g ha(-1)). The membrane-disrupting organic arsenical MSMA was effective with all biotypes, whereas commercial chemical herbicides which act by inhibiting branched-chain amino acid synthesis (chlorimuron, imazaquin and imazethapyr) were less effective against normal seeded common cocklebur biotypes with short stature. These studies showed that multiple seeded cocklebur was at least as susceptible to the biological agent A helianthi and to the conventional commercial herbicides studied as were normal seeded cockleburs, suggesting that existing methods should be adequate to control this novel biotype.

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“…Herbicide interactions have been extensively investigated and reported with respect to synergism, antagonism, and additivity (Colby 1967;Hatzios and Penner 1985). Previous research has demonstrated the benefit of utilizing reduced rates of selected soybean herbicides in mixtures to enhance weed control and diminish the development of resistant weed biotypes (Defelice et al 1989;Gressel 1990;Starke and Oliver 1998). However, little information has been published examining reduced rates of corn herbicides in mixtures for common lambsquarters control.…”

Section: Introductionmentioning

confidence: 99%

Halosulfuron and 2,4-D Mixtures' Effects on Common Lambsquarters (Chenopodium album)

et al. 2006

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Greenhouse and laboratory experiments were conducted to investigate the response of common lambsquarters to POST applications of halosulfuron–methyl plus 2,4-D admixtures and to investigate the effects of 2,4-D on the absorption, translocation, and metabolism of halosulfuron. In the greenhouse, halosulfuron at 0, 4.5, 9, 18, and 36 g ai/ha was applied alone and mixed with 2,4-D at 0, 17, 35, and 70 g ai/ha POST to 7.5- to 9-cm seedlings, and plant fresh weights were determined 4 wk after treatment (WAT). Halosulfuron alone did not control this weed, while fresh weights of common lambsquarters treated with 2,4-D declined hyperbolically as rates increased. A synergistic response for mixtures of these herbicides occurred, as observed fresh weights for all combinations were less than expected based on independent action and the calibrated marginal responses. In the laboratory, 7.5- to 9-cm seedlings were treated POST with commercially formulated halosulfuron at 9 and 18 g/ha and 2,4-D at 0, 70, and 140 g/ha, respectively, followed by foliar-applied14C-halosulfuron. Absorption of14C-halosulfuron increased with time, and absorption and translocation were not influenced by the addition of 2,4-D. Results from these studies inferred that halosulfuron and 2,4-D were generally synergistic on common lambsquarters and that mechanisms other than absorption, translocation, and metabolism may explain this response.

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Weed Control in Soybeans (Glycine max) with Reduced Rates of Postemergence Herbicides

Cited by 111 publications

References 15 publications

ALS-Resistant Spotted Spurge (Chamaesyce maculata) Confirmed in Georgia

ALS-Resistant Spotted Spurge (Chamaesyce maculata) Confirmed in Georgia

Response of multiple seeded cocklebur and other cocklebur types to herbicide treatment

Halosulfuron and 2,4-D Mixtures' Effects on Common Lambsquarters (Chenopodium album)

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