Dicamba Injury to Soybean

Weidenhamer, Jeffrey D.; Triplett, G. B.; Sobotka, Francis E.

doi:10.2134/agronj1989.00021962008100040017x

Cited by 88 publications

(163 citation statements)

References 3 publications

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“…Second, approximate stages of peanut growth were R1 (beginning bloom), R3 (beginning pod) and R6 (full seed) at 30, 60, and 90 DAP, respectively. In soybean, dicamba caused greater yield reductions when exposure occurred at bloom (Auch and Arnold, 1978;Wax et al, 1969;Weidenhamer et al, 1989). Similar results have also been observed in cotton (Hamilton and Arle 1979).…”

Section: Resultsmentioning

confidence: 64%

Peanut Yield Response to Dicamba

Prostko¹,

Grey²,

Marshall³

et al. 2011

Peanut Science

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Research was conducted at eight locations across the United States peanut belt during 2008 to evaluate peanut response to postemergence applications of dicamba. Dicamba was applied at 0, 40, 70, 140, 280 and 560 g ai/ha at 30, 60, and 90 days after peanut planting (DAP). In 5 of 8 locations, peanut yield losses were greater when dicamba was applied at 30 and 60 DAP when compared to 90 DAP. Estimated yield losses for dicamba applied at 40 g ai/ha ranged between 2% to 29%. Estimated yield losses for dicamba applied at 560 g ai/ha ranged between 23% to 100%. These data may aid peanut growers in making appropriate management decisions in situations where offtarget movement of dicamba has occurred or sprayer contamination is suspected.Key Words: Arachis hypogaea L., crop tolerance, drift, herbicide injury, sprayer contamination.Concerns regarding glyphosate-resistant weeds has led to an interest in developing alternative herbicide-tolerant crops. Dicamba-tolerance is being developed in several broadleaf crops including soybean [Glycine max (L.) Merr.] and cotton (Gossypium hirsutum L.) (Behrens et al. 2007;Subramanian et al. 1997). Currently, dicamba is registered for postemergence broadleaf weed control use in various grass crops such as field corn (Zea mays L.), sorghum [Sorghum bicolor (L.) Moench], and wheat (Triticum aestivum L.) (Anonymous, 2011).Dicamba's reputation for off -target movement due to drift and volatility has been well documented (Al-Khatib and Peterson, 1999;Behrens and Lueschen, 1979). In the southeast, peanut is grown in close proximity to both soybean and cotton. Thus, the adoption of dicamba-tolerance in these crops increases the probability of drift, volatilization, and tank contamination problems that could negatively influence peanut development and yield.Peanut response to dicamba has not been well documented. Dicamba applied at approximately 2 g/ha had no effect on peanut yield in one field trial (Prostko et al. 2009). However, other studies on the control of volunteer peanut indicated that peanut is not tolerant of dicamba (York et al. 1994). In a related forage crop, rhizome peanut (Arachis glabrata Benth) yields were significantly reduced by a foliar application of dicamba + 2,4-D (Ferrell et al. 2006). Other systematic studies on the influence of dicamba rate and timing on peanut have not been published in the literature. Therefore, the objective of this research was to quantify the effects of various rates of dicamba, applied at 30, 60 or 90 days after planting (DAP), on peanut yield. Materials and MethodsField trials were conducted at eight locations across the United States peanut belt during 2008. A complete description of these locations is presented in Table 1. Production and pest management practices were followed according to local Cooperative Extension recommendations.All trials were conducted in a randomized complete block design with a three (application timing) by six (dicamba rate) factorial arrangement of treatments. Dicamba timings were 30, 60, and 90 DAP and d...

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Section: Resultsmentioning

confidence: 64%

Peanut Yield Response to Dicamba

Prostko¹,

Grey²,

Marshall³

et al. 2011

Peanut Science

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“…1, 3, and 4; Table 3). The available literature suggests that small yield losses could be expected from a 0.56 g acid equivalent/ha exposure to susceptible soybean varieties [7,19,[35][36][37][38]. Because our experimental design does not include assessment of particle drift or additional routes of exposure including residual herbicide in spray equipment [5] or atmospheric deposition [34], total nontarget exposures to crops and wild plants could be substantially greater than our predictions for vapor drift.…”

Section: Dose-distance Relationshipsmentioning

confidence: 99%

“…More research is also needed to fully understand the response of nontarget plants to these low-dose exposures. The available literature suggests that small yield losses could be expected from a 0.56 g acid equivalent/ha exposure to susceptible soybean varieties [7,19,[35][36][37][38]. However, data from the U.S. EPA vegetative vigor tests associated with the registration of dicamba products also indicate that 0.56 g acid equivalent/ha is well below the 25% effective concentration for biomass (or the dicamba dose affecting a 25% reduction in biomass) for several crops in the seedling stage, including soybean, tomato, canola, and cucumber, indicating little risk [39,40].…”

Section: Dose-distance Relationshipsmentioning

confidence: 99%

Quantifying vapor drift of dicamba herbicides applied to soybean

Egan¹,

Mortensen²

2012

Enviro Toxic and Chemistry

119

144

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Recent advances in biotechnology have produced cultivars of corn, soybean, and cotton resistant to the synthetic-auxin herbicide dicamba. This technology will allow dicamba herbicides to be applied in new crops, at new periods in the growing season, and over greatly expanded areas, including postemergence applications in soybean. From past and current use in corn and small grains, dicamba vapor drift and subsequent crop injury to sensitive broadleaf crops has been a frequent problem. In the present study, the authors measured dicamba vapor drift in the field from postemergence applications to soybean using greenhouse-grown soybean as a bioassay system. They found that when the volatile dimethylamine formulation is applied, vapor drift could be detected at mean concentrations of 0.56 g acid equivalent dicamba/ha (0.1% of the applied rate) at 21 m away from a treated 18.3 × 18.3 m plot. Applying the diglycolamine formulation of dicamba reduced vapor drift by 94.0%. With the dimethylamine formulation, the extent and severity of vapor drift was significantly correlated with air temperature, indicating elevated risks if dimethylamine dicamba is applied early to midsummer in many growing regions. Additional research is needed to more fully understand the effects of vapor drift exposures to nontarget crops and wild plants.

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“…Soybean, cotton (Gossypium hirsutum L.), and grain sorghum (Sorghum bicolor) are among the crop species most susceptible to synthetic auxin herbicides, such as dicamba, 2,4-D, and florpyrauxifen-benzyl. Previous research has reported numerous consequences of dicamba drift onto non-dicambaresistant soybean, such as reduced growth, fewer seeds per pod, lower seed quality, maturity delays, and pod malformation [16][17][18][19][20]. Symptomology can vary from chlorosis of the terminal buds, cupping or crinkling of canopy leaves, and leaf or stem epinasty.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Simulated Drift Rates of Common ALS-Inhibiting Rice Herbicides to Florpyrauxifen-Benzyl on Soybean

Schwartz-Lazaro

Miller

Norsworthy

et al. 2017

International Journal of Agronomy

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Acetolactate synthase-(ALS-) herbicides are among the most commonly used sites of action (SOA) in rice production. Many herbicides used in rice can cause carryover to soybean, which is commonly grown near to or rotated with rice. Florpyrauxifen-benzyl (Rinskor6 Active) brings an alternative SOA to rice production. The objective of this study was to compare the effects of simulated drift rates of florpyrauxifen-benzyl to commonly used ALS-inhibiting rice herbicides on soybean. A field study was conducted at two locations examining five ALS-inhibiting rice herbicides as well as florpyrauxifen-benzyl at a 1/20x and 1/80x simulated drift rate. Crop injury, height, and yield were evaluated at 14, 21, and 35 days after treatment (DAT). Florpyrauxifen-benzyl and bispyribac showed high injury levels at both drift rates. At 35 DAT florpyrauxifen-benzyl caused 76% and 17% visible damage to soybean whereas bispyribac caused 35 and 9% injury at 1/20x and 1/80x, respectively. These treatments resulted in a reduction in soybean height and yield. Although this alternative SOA herbicide in rice may be effective for weed control, our research demonstrates it to be injurious to soybean at both drift rates tested. Thus, proper precautions should be taken to avoid injury by ensuring that the label is followed.

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Dicamba Injury to Soybean

Cited by 88 publications

References 3 publications

Peanut Yield Response to Dicamba

Peanut Yield Response to Dicamba

Quantifying vapor drift of dicamba herbicides applied to soybean

Comparison of Simulated Drift Rates of Common ALS-Inhibiting Rice Herbicides to Florpyrauxifen-Benzyl on Soybean

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