Evaluating Drift Control Agents to Reduce Short Distance Movement and Effect on Herbicide Performance<sup>1</sup>

VanGessel, Mark J.; Johnson, Quintin R.

doi:10.1614/wt-03-248r

Cited by 18 publications

(17 citation statements)

References 22 publications

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“…Fietsam et al (2004) found that a polyacrylamide-and polysaccharide-based DCA reduced total drift by 13% and 18%, respectively. Similar to our findings, Vangessel et al (2005) found that the addition of DCAs to flood or flat-fan nozzles did not reduce spray drift or injury to sorghum.…”

Section: Resultssupporting

confidence: 90%

“…This lack of change in D V0.1 values is probably the reason there was no difference in D L or D I distances for the two pressures. Although detectable drift would have been greater if the water-sensitive cards had been placed above the soil surface (Vangessel and Johnson 2005), the relative differences among nozzles are not expected to have been different.…”

Section: Resultsmentioning

confidence: 99%

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Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

et al. 2006

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Field experiments were conducted to evaluate the effect of five spray-nozzle types and three drift-control adjuvants (DCA) on glyphosate spray drift. The extended-range (XR) flat-fan nozzle at 280 kPa was used as the standard comparison. DCAs were evaluated for drift reduction with the use of the XR and air-induction (AI) nozzles. Wind speed ranged from 1.3 to 9.4 m/s (3 to 21 mph). Lethal drift (DL) and injury drift (DI) were determined by downwind visual observation of grain sorghum response. Drift distances were measured from the spray swath edge. The Turbo FloodJet and AI nozzles reduced DLdistance by 34%. All four drift-reducing (DR) nozzles reduced DIdistance by 22 to 32%. Reducing the pressure of the XR flat-fan nozzle from 280 to 140 kPa did not reduce DLor DIdistance. When applied through AI nozzles, each DCA increased droplet volume diameter, one DCA reduced DIdistance and none reduced DLdistance when applied through XR tips. The DCAs did not affect DLor DIdistance.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

et al. 2006

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“…Drift control agents can also impact the size of droplets by altering the viscosity of the spray solution through reducing the liquid's ability to stretch and separate into small droplets (VanGessel and Johnson 2005). When asked how frequently applicators added drift control agents to the solution, 74% of commercial and 48% of noncommercial applicators indicated that they use drift control agents ≥50% of the time (Table 4).…”

Section: Current Herbicide Application Practicesmentioning

confidence: 99%

“…Many factors that can contribute to herbicides moving away from target plants and onto nontarget plants, such as physical drift of herbicide droplets and contamination of improperly cleaned spray tanks, can be managed by the applicator (Vangessel and Johnson 2005).…”

mentioning

confidence: 99%

Survey of Missouri Pesticide Applicator Practices, Knowledge, and Perceptions

Bish

Bradley

2017

Weed Technol

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The introduction of soybean and cotton traits with resistance to synthetic auxin herbicides has led to an increase in concern over the off-target movement of dicamba and 2,4-D. A direct-mail survey was sent to Missouri pesticide applicators in January of 2016 to understand current herbicide application practices and applicator knowledge and awareness of the new synthetic auxin technologies. Completed surveys were returned by 2,335 applicators, representing approximately 11% of the state's registered pesticide applicators. Survey data reported herein provides information regarding current pesticide applicator knowledge and practices and highlights areas that need more emphasis during applicator training. Overall, survey respondents were familiar with physical drift and methods to minimize that risk. However respondents were less familiar with volatility and temperature inversions, which can each influence off-target herbicide movement. Of the 427 commercial applicators and 1,535 noncommercial applicators who answered questions regarding volatility, 81% and 74% respectively, recognized that high temperatures can contribute to a herbicide's ability to volatilize. However, only 48% and 39% understood that a herbicide's vapor pressure influences volatility. Answers from the survey indicate further education is needed on the synthetic auxin technologies, such as what herbicides can be used with each technology, proper methods for inspecting and cleaning spray equipment, and the importance of reading herbicide labels. When asked whether applicators were aware of the new 2,4-D-resistant and dicamba-resistant traits, 76% of 443 commercial applicators and only 40% of 1,713 noncommercial applicators selected "yes." Additionally, survey results suggests that current methods aimed to facilitate communication among producers and applicators, such as FieldWatch and Flag the Technology, may not be successfully adopted, at least in Missouri. Findings from this survey can be utilized to enhance training of pesticide applicators in preparation for the synthetic auxin herbicide technologies. Nomenclature: dicamba; 2,4-D; cotton, Gossypium hirsutum L.; soybean, Glycine max (L.) Merr. Key words: Synthetic auxin herbicide, herbicide label, nozzles, drift-control agents, herbicideresistance traits, herbicide injury, spray tank, contamination, physical drift, volatility, wind speeds, temperature inversion, FieldWatch, Flag the Technology, specialty crops.La introducción de soja y algodón con resistencia a herbicidas auxinas sintéticas ha generado preocupación por el movimiento accidental de dicamba y 2,4−D a lugares no deseados. En Enero de 2016 se envió una encuesta vía correo directo a aplicadores de plaguicidas con licencia de Missouri para entender las prácticas de aplicación de herbicidas actuales y el conocimiento de los aplicadores acerca de las nuevas tecnologías de auxinas sintéticas. Se recibieron 2,335 encuestas completadas por aplicadores, lo que representó 11% del registro de aplicadores de plaguicidas del estado. Los datos...

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“…Drift control agents modify spray characteristics to reduce spray drift, usually by minimizing small droplet formation. They are generally polyacrylamide or polyvinyl polymers [52].…”

Section: Drift Control Agentsmentioning

confidence: 99%

Herbicides and Adjuvants

Pacanoski¹

2015

Herbicides, Physiology of Action, and Safety

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Abstract"djuvants are any substance either added in a herbicide formulation or added to the spray tank that modifies herbicidal activity or application characteristics, such as better mixing and handling, increasing droplet coverage, spray retention and droplet drying, increasing herbicide cuticle penetration and cellular accumulation reducing leaching of herbicide through the soil profile, etc. The interactions between herbicide adjuvants and herbicide activity, however, are not simple processes, and depend on factors that include crop/weed leaf surface, droplet characteristics, adjuvant type, chemical form of the herbicide, and environmental conditions. Understanding the complexity of these interactions is essential for optimum herbicide utilization, particularly in prolonging, enhancing and improving the efficacy reduction of the critical rain-free period minimizing herbicide leaching into groundwater and decreasing harmful effects to non-target plants and animals.

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Evaluating Drift Control Agents to Reduce Short Distance Movement and Effect on Herbicide Performance¹

Cited by 18 publications

References 22 publications

Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

Survey of Missouri Pesticide Applicator Practices, Knowledge, and Perceptions

Herbicides and Adjuvants

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Evaluating Drift Control Agents to Reduce Short Distance Movement and Effect on Herbicide Performance1

Cited by 18 publications

References 22 publications

Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

Survey of Missouri Pesticide Applicator Practices, Knowledge, and Perceptions

Herbicides and Adjuvants

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Resources

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Evaluating Drift Control Agents to Reduce Short Distance Movement and Effect on Herbicide Performance¹