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Spray drift is one of the most important issues facing pesticide applicators. Movement to off-site locations can be caused by wind, poor calibration/adjustment, and operator error.

1) Select a nozzle that produces coarser droplets
Use droplets that are as coarse as practical to provide necessary coverage.

2) Use the lower end of the pressure range
Higher pressures generate many more small droplets (less than 100 microns). Under most conditions, do not exceed 40 to 45 psi.

3) Maintain a constant travel speed and pressure during spraying
If an automatic regulator is fitted, remember, small increases in speed result in large increases in pressure. The delivered air and spray must be given time to penetrate the canopy.

4) Lower boom height
Wind speed increases with height. If boom height is a few inches lower, off-target drift is reduced.

5) Increase nozzle size
Larger capacity nozzles reduce drift. If you use nozzles that put out 10 to 15 gallons per acre (GPA), increase to nozzles that put ou...

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Resources

WSU Tree Fruit Research

& Extension Center

http://www.tfrec.wsu.edu/

 

WA Tree Fruit Research Commission

www.treefruitresearch.com/

 

Good Fruit Grower

www.goodfruit.com

 

Fruit Growers News

www.fruitgrowersnews.com

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