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Controlling spray drift of pesticides with self-emulsifiable esters

a technology of self-emulsification and esters, which is applied in the field of control of spray drift of pesticides with self-emulsification esters, can solve the problems of many commercially available drift retardants that do not work with many aerially applied herbicide tank mixtures, and the application restrictions of sensitive crops, etc., to achieve the effect of reducing spray drift, reducing spray drift, and reducing spray dri

Inactive Publication Date: 2010-05-06
DOW AGROSCIENCES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]It has now been found that by incorporating a self-emulsifiable ester into an agricultural spray mixture that spray drift during application can be reduced. The present invention concerns a method to reduce spray drift during the application of a pesticide which comprises incorporating into the pesticidal spray from about 0.01 to about 5 percent vol / vol of a self-emulsifiable ester or mixture thereof. The reduction in spray drift may result from a variety of factors including a reduction in the production of fine spray droplets (<175μ in diameter) and an increase in the volume median diameter (VMD) of the spray droplets. For a given spray apparatus, application, and condition, and based on the self-emulsifiable ester, the median diameter of the plurality of spray droplets is increased above that of a spray composition without said self-emulsifiable ester.

Problems solved by technology

Some herbicides have demonstrated very sensitive phytotoxicity to particular plant species at extremely low parts per million (ppm) or even parts per billion (ppb) levels, resulting in restricted applications around sensitive crops, orchards and residential plantings.
However, high molecular weight, water-soluble polymers are not entirely satisfactory because they are expensive to use at the concentrations required to substantially increase droplet size.
Furthermore, research has shown that many commercially available drift retardants typically do not work with many aerially applied herbicide tank mixtures, due to pump shear, wind shear and other performance issues, which are more pronounced in high speed aerial application conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018]To make each concentrated 2,4-D formulations A to G as in Table 1, a stainless steel beaker equipped with a mechanical stirrer was first charged with 90 grams DMA 6 SEQUESTERED, containing 68.8% 2,4-D dimethylammonium salt in an aqueous solution. 10 grams total of the different combinations of the Priolube products were then added according to the compositions in Table 1. Each liquid mixture was stirred to homogenize the composition and to furnish the formulation.

[0019]The aqueous spray solution was made by adding 1 mL of the each formulation to 99 mL of deionized water to make a 1% v / v dilution. The spray solution was then sprayed through a TeeJet 8002 flat fan nozzle at 40 psi (276 kilopascal (kPa)) and the droplet size was measured by using a Sympatec Helos particle sizer. The measurements were made with the tip of the nozzle at either 6 or 12 inches (15.24 or 30.48 centimeters (cm)) from the measurement zone of the particle sizer. The results are reported in Table 2 (6 inc...

example 2

[0020]The spray solution of formulations of H to N at 1% v / v was made following the same procedure as in Example 1. To each spray solution was then added the proper amount of glyphosate dimethylammonium salt to achieve an acid equivalent ratio between 2,4-D and glyphosate of 1:1. The dilution was stirred to homogenous to furnish the spray solution. It was then sprayed following the same procedure and settings as described in Example 1. The results are shown in Table 4 (measured 6 inches (15.24 cm) from spray nozzle) and Table 5 (measured 12 inches (30.48 cm) from nozzle). As can be seen from these results, the addition of glyphosate does not significantly affect the spray distribution from previous example, indicating the robustness of the present invention in controlling the driftable fines.

TABLE 4Spray Performance of Example 2 Compositions6 Inches (15.24 cm) from Nozzle.SprayPercent Percent Spray solutionCompositionVMD, μm100 μm175 μmDMA 6 SEQ 1%213.0015.9938.72HA 1% +240.3510.023...

example 3

[0021]To make each of the concentrated herbicide formulations O to Q shown in. Table 4, a stainless steel beaker equipped with a mechanical stirrer was first charged with 95 g of the herbicide formulation (either DMA6 SEQ, Garlon 3A*, or Milestone**) and 5 g of Hetester PCA (obtained from Alzo International Inc.). Each liquid mixture was stirred to homogenize the composition and to furnish the formulation for subsequent dilution and spray analysis.

[0022]The aqueous spray solutions of each were made by adding 2 ml of each of the formulations to 98 ml of deionized water to make 2% v / v dilutions. The solutions were then sprayed following the same procedure and settings as described in Example 1, with the spray nozzle 12 inches (30.48 cm) from particle sizer measurement zone. The results are shown in Table 6. As can be seen from these results, the present invention does effectively reduce the driftable fine droplets by narrowing the drop size distribution profile without significantly i...

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PUM

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Abstract

Spray drift during the application of agricultural chemicals is reduced by incorporating a self-emulsifiable ester into the liquid to be sprayed.

Description

[0001]This application claims the benefit of U.S. Provisional Application Ser. No. 61 / 110,060 filed on Oct. 31, 2008.BACKGROUND OF THE INVENTION[0002]The present invention concerns a novel method to reduce spray drift during the application of agricultural chemicals by incorporating a self-emulsifiable ester into the liquid to be sprayed. Agricultural spraying by economical and available technologies uses hydraulic spray nozzles that inherently produce a wide spectrum of spray droplet sizes. The potential for these spray droplets to drift from the initial, desired site of application is found to be a function of droplet size, with smaller droplets having a higher propensity for off-target movement. Significant research efforts, involving numerous field trials, wind tunnel tests and subsequent generation of predictive math models have led to a greatly enhanced understanding of the relationship between spray droplet size and potential for off-target drift. Although other factors such ...

Claims

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Application Information

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IPC IPC(8): A01N57/18A01N43/40A01N37/10
CPCA01N25/30A01N39/04A01N37/40A01N43/40A01N57/20A01N2300/00A01N25/24A01N37/38
Inventor QIN, KUIDETANK, HOLGERWILSON, STEPHEN L.LIU, LEIOUSE, DAVID G.LI, MEI
Owner DOW AGROSCIENCES LLC
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