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Evaluation Of A Modified Guar Od Formulation For Spray Drift Mitigation31st Symposium Pesticide Formulations And Delivery Systems
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Book Synopsis Evaluation of a Modified Guar OD Formulation for Spray Drift Mitigation31st Symposium Pesticide Formulations and Delivery Systems by : Johnnie Roberts
Download or read book Evaluation of a Modified Guar OD Formulation for Spray Drift Mitigation31st Symposium Pesticide Formulations and Delivery Systems written by Johnnie Roberts and published by . This book was released on 2011 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oil dispersions (OD) of spray drift mitigation agents offer ease of incorporation of the agent into the tank mix. An oil dispersion of guar gum has been developed that not only achieves even dispersion of guar into the spray tank but also exhibits good physical stability. The influence of dispersing agents and emulsifiers on spray characteristics, rheology, and physical stability was examined.
Book Synopsis Evaluation of a Modified Guar OD Formulation for Spray Drift Mitigation by : Alan Halecky
Download or read book Evaluation of a Modified Guar OD Formulation for Spray Drift Mitigation written by Alan Halecky and published by . This book was released on 2011 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oil dispersions (OD) of spray drift mitigation agents offer ease of incorporation of the agent into the tank mix. An oil dispersion of guar gum has been developed that not only achieves even dispersion of guar into the spray tank but also exhibits good physical stability. The influence of dispersing agents and emulsifiers on spray characteristics, rheology, and physical stability was examined.
Book Synopsis Oil Dispersion Formulations by : Franci L. S. Leal
Download or read book Oil Dispersion Formulations written by Franci L. S. Leal and published by . This book was released on 2016 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the search for new agrochemicals with safe and improved agronomic efficacy in the field, oil dispersion (OD) formulations have been investigated intensively because they are expected to have a better performance on crops than ordinary formulations. This is because the oils and surfactants within the formulation play the role of adjuvants. Therefore, an OD formulation may show a better biological efficacy, making the addition of tank mix adjuvant (regularly used in association with systemic pesticides) optional. The main goal of this work was to develop a new insecticide OD formulation with active ingredients that would be produced as a suspoemulsion (SE), resulting in a better and easier way of formulating a commercial product. These formulations were developed with new surfactants and dispersants and were stabilized using different rheology modifiers, showing appropriate results in stability tests. Rheological assessments were also performed in order to understand system microstructure. The new insecticides' OD formulations also exhibited excellent performance in physical-chemical lab tests and were subjected to field trials with cotton crops at Primavera do Leste, Mato Grosso, Brazil, during the 2012-2013 season. The target insect evaluated in this study was the cotton boll weevil, Anthonomus grandis Boh. (Coleoptera: Curculionidae), which is primarily responsible for damage to Brazilian cotton. The results from using the new OD formulations showed an improved performance when compared to tank mixtures of the same insecticides. Dispersants and rheology modifiers used in this development are promising tools for future OD formulation technology.
Book Synopsis Wind Tunnel and Field Evaluation of Drift from Aerial Spray Applications with Multiple Spray Formulations by : Robert E. Wolf
Download or read book Wind Tunnel and Field Evaluation of Drift from Aerial Spray Applications with Multiple Spray Formulations written by Robert E. Wolf and published by . This book was released on 2013 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The impact of tank mix adjuvants and a formulated fungicide on spray atomization and in-field movement under aerial application conditions was examined. High speed wind tunnel testing was conducted to determine droplet size resulting from treatments selected for evaluation in the field. These treatments included a "blank" (water plus a non-ionic surfactant) as well as five additional solutions with a formulated fungicide, four of which have an additional adjuvant. The wind tunnel testing measured droplet size using the flat fan nozzles and operational parameters (spray pressure, nozzle orientation, and airspeed) selected for field trials. These treatments were then evaluated in the field for both in-swath and downwind deposition, with a mass balance on the measured results used to compare each of the formulated product treatments to a reference treatment. Wind tunnel results showed the formulated product tank mixes resulted in significantly different droplet sizes than the water and non-ionic surfactant "blank" reference sprays. Additional adjuvants resulted in minimal changes in droplet size as compared to the formulated product mixture. However the polymer tested broadened the droplet size distribution. Drift modeling of the wind tunnel droplet size results demonstrated little difference between the formulated product and spray adjuvant spray mixtures. However, all treatment solutions significantly reduced modeled drift as compared to the reference treatment. While the field study results did highlight significant differences between treatments solutions, it also showed a great degree in data variability as a result of meteorological and sampling issues. These results have led the authors to conclude that field testing of potential drift reduction technologies under aerial application conditions will be cost prohibitive and likely would give highly variable results. Wind tunnel evaluations at certified laboratories offer a much quicker and inexpensive method for evaluating large numbers of nozzle and spray formulation treatments.
Book Synopsis Drift Control Adjuvant Benchmarking in Agricultural Spray Applications by : Kevin Penfield
Download or read book Drift Control Adjuvant Benchmarking in Agricultural Spray Applications written by Kevin Penfield and published by . This book was released on 2014 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drifting of fine droplets during the application of pesticides is an issue of increasing commercial and regulatory importance. Spray drift damages susceptible crops, wastes resources, and results in inconsistent weed control. Several strategies are currently used to mitigate this problem. These include enhanced nozzle technology, improved application techniques, and inclusion of drift control additives in the final tank mix. Elimination of small diameter droplets ("driftable fines") is a key goal. Measurements were made of droplet size distributions of sprayed pesticide formulations containing commercial products representative of the leading drift control technologies, including guar, polyacrylamides, lecithin, and oil/surfactant mixtures. Effects of spray nozzle and pressure were also evaluated. Nozzle technology plays a large role in determining the spray droplet size spectrum. However, there is a strong interplay between nozzle design and formulation variables. We found that drift control agents have greater impact on spray from flat fan nozzles. Also, the ranking of adjuvants depends on the nozzle technology in use: for glyphosate/ammonium sulfate solutions, polymers were more effective in reducing fines from a flat fan nozzle, while surfactant-based products were marginally superior when an air induction nozzle was used. The regulatory community is currently focused on mitigating the generation of small droplets. However, the generation of oversized droplets also effects spray efficacy. The impact of drift control agents on the breadth of the droplet size spectrum is an aspect of drift control which is often overlooked. We found that emulsion-based products tighten the droplet size distribution, while the polymer-based products shift the mean droplet diameter up, broadening the distribution in the process: while the latter effect may earn better ratings from regulatory agencies concerned exclusively with spray drift mitigation, it may be less helpful in enhancing application efficacy.
Book Synopsis Field Scale Evaluation of Spray Drift Reduction Technologies from Ground and Aerial Application Systems by : Bradley K. Fritz
Download or read book Field Scale Evaluation of Spray Drift Reduction Technologies from Ground and Aerial Application Systems written by Bradley K. Fritz and published by . This book was released on 2011 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this work is to evaluate a proposed test plan for the validation testing of pesticide spray drift reduction technologies (DRTs) for row and field crops, focusing on the testing of ground and aerial application systems under full-scale field evaluations. The measure of performance for a given DRT tested under field conditions is the downwind deposition as measured on horizontal fallout collectors. Ground and aerial application equipment were evaluated for in-swath and downwind deposition of sprays as applied by both a reference system and a drift reducing technology. For this study, the reference system was defined as a spray boom outfitted with the ASABE Fine/Medium boundary reference nozzles. For the ground system, the drift reducing system tested was a ground sprayer outfitted with an air-induction version of the reference nozzle. The aerial system DRT was a flat fan nozzle specifically designed for aerial application usage. Downwind deposition was measured from the edge of the swath out to 100 m downwind. Additionally, the airborne portion of the spray remaining suspended in the air at 50 m downwind was measured. There were a number of confounding issues with the measured data including poor recovery of deposits and non-ideal wind directions during specific replications. Even with these issues, the drift reduction between the reference and DRT system measured in the field for the aerial trials was similar to that estimated using the agricultural dispersion model. A number of additional improvements and checks are suggested prior to further field evaluations.
