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Pesticide Drift Management. Dr. Eric P. Prostko Extension Weed Specialist University of Georgia. Pesticide Drift Management Topics For Discussion. definition types of drift factors affecting drift equipment management. What is pesticide drift??.

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Pesticide drift management

Pesticide Drift Management

Dr. Eric P. Prostko

Extension Weed Specialist

University of Georgia


Pesticide drift management topics for discussion
Pesticide Drift ManagementTopics For Discussion

  • definition

  • types of drift

  • factors affecting drift

  • equipment

  • management


What is pesticide drift
What is pesticide drift??

  • the movement of the pesticide away from the target area.

  • physical drift

  • vapor drift


Spray drift is undesirable
Spray drift is undesirable!!

  • inefficient use of equipment and time

  • under-application/ineffective control

  • litigation concerns

  • unintentional contamination of foodstuffs

  • air/water pollution

  • livestock and human health/safety


Corn and grain sorghum yield loss from simulated staple drift college station 1994
Corn and Grain Sorghum Yield Loss From Simulated Staple Drift, College Station, 1994.

Applied 30 DAP


Physical drift
Physical Drift Drift, College Station, 1994.

  • movement of pesticide away from target during application

  • droplet size

  • boom height

  • weather


Studies have shown that equipment and its operation are responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.

D. B. Smith et al., 1982


Physical drift droplet size
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Droplet Size

  • measured in microns

  • hair - 50 microns

  • 20-370 micron range

  • 200 micron average

  • smaller drops increase drift potential (< 100)


Fall rate of various size droplets
Fall Rate of Various Size Droplets responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.


Relationship of particle size to drift
Relationship of Particle Size to Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.

Based upon 10’ fall in 3 MPH winds


Physical drift droplet size1
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Droplet Size

  • nozzle selection

  • Drift Guard Nozzles

    * reduces volume of

    droplets below 200

    microns up to 65%

  • Raindrop Nozzles

    * 0.7% - 200 microns

    or less


Physical drift spray boom height
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Spray Boom Height

Spacing

* Easy and inexpensive

* Wide-angle nozzles can be placed lower to the ground but also produce smaller droplets.


Physical drift weather
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Weather

  • wind speed/direction

    * most important

  • temperature

  • humidity

  • inversions


Physical drift temperature inversions
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Temperature Inversions

Normal

Inversion


Physical drift other factors to consider
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Other Factors to Consider

  • nozzle orientation

  • spray pressure

  • spray volume


Physical drift nozzle orientation
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Nozzle Orientation

  • ground speeds > 10 MPH

  • 450 or more from perpendicular

30% < 100 microns

88% < 100 microns


Influence of spray pressure on droplet size flat fan nozzle 0 6 gpm
Influence of Spray Pressure on Droplet Size responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Flat Fan Nozzle - 0.6 GPM


Physical drift spray volume
Physical Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Spray Volume

  • most effective means to increase spray volume is to increase nozzle orifice size

  • i.e. 8002 vs. 8003 vs. 8004


Vapor drift
Vapor Drift responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.

  • the volatilization or evaporation of a pesticide from the soil or crop surface that occurs after application.

  • Factors that influence vapor drift include:

    *vapor pressure/volatility

    * temperature

    * wind speed


Vapor drift can occur even days after the application
Vapor drift can occur even days after the application responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.

Wind

Drift

Vapor

Non-Target

Sensitive Crop


Vapor pressure values of various chemicals @ 77 0 f
Vapor Pressure Values of Various Chemicals responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.@ 770F

Note: The higher the number the more volatile the chemical.


Pesticide drift management equipment modifications
Pesticide Drift Management responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Equipment Modifications

  • shielded spray boom

  • covered boom

  • hooded-sprayers

  • air-assist systems

  • electrostatic spraying


Pesticide drift management drift control agents
Pesticide Drift Management responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.Drift Control Agents

  • “thickeners”

  • increase droplet size of pesticide/water mixes

  • $0.10-$1.00/A

  • 38F, Anchor, Array, Border, Chem-Trol, Corsair, Direct, Drifgon, Driftgard, Drop Zone, Get Down, Lo-Drift, More, Nalcotrol, Submerge, Sta-Put, Windfall


Drift fallout as influenced by pressure and nalcotrol
Drift Fallout As Influenced By Pressure and Nalcotrol responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.

Source: W. Bowers. 1975. Ohio State Univ. Extension, Facts #1203.


Top 10 tips for reducing pesticide drift

nozzle selection responsible for 68-90% of the physical drift problems while weather accounts for 10-32%.

reduce pressure

lower boom height

increase nozzle size

avoid spraying when winds exceed 10 MPH

lookout for inversions

use additives

calibrate sprayer

keep records

use common sense

Top 10 Tips For Reducing Pesticide Drift


References used in the development of this slide set include the following
References used in the development of this slide set include the following:

  • Reducing Spray Drift. Ohio State Univ. Extension Bulletin 816, H. Erdal Ozkan.

  • Herbicide Application Management. Sandoz Crop Protection, 1993.


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