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Spray Drift Affects Sensitive Crops. R. David Myers Extension Educator [email protected] A Vineyard Coming to a Farm Near You!. Vineyard Floor Management. 2,4-D damage to vine. Vineyard Team. Ramano Vineyard Establishment Year 2007. CMREC , Upper Marlboro. Alternative Crops &

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Spray drift affects sensitive crops

Spray Drift Affects Sensitive Crops

R. David Myers

Extension Educator

[email protected]



Vineyard Floor Management

2,4-D damage to vine




CMREC , Upper Marlboro

Alternative Crops &

Sustainable Practices

?




Herbicide drift potential
Herbicide Drift Potential

  • All herbicides are subject to particle drift.

  • Vapor drift potential varies by each herbicide’s vapor potential.

  • Droplet size controls both types of drift.

  • Wind, temperature and humidity affects drift severity.


Herbicides with high drift damage potential
Herbicides with High Drift Damage Potential

  • High vapor potential herbicides.

  • Herbicides that are active at very low application rates.

  • Herbicides that are Plant Growth Regulators (PGR’s)


Wssa group 4 growth regulators synthetic auxins
WSSA Group 4Growth Regulators Synthetic Auxins



Note: Spray particles under 50 microns in diameter may remain suspended in the air indefinitely or until they evaporate.


  • In relatively dry, warm air (e.g., 30 percent relative humidity and 78°F), a 100-micron droplet quickly loses water by evaporation and becomes less than half its original diameter (one-eighth of its original volume) while falling only 2.5 feet.

  • By comparison, in relatively moist air (e.g., 70 percent relative humidity and 78°F), a 100-micron particle will fall 5 feet and hit the ground before evaporating to half its original diameter.

Small droplets become smaller very quickly


Spray drift affects sensitive crops1

Spray Drift Affects humidity and 78°F), a 100-micron droplet quickly loses water by evaporation and becomes less than half its original diameter (one-eighth of its original volume) while falling only 2.5 feet. Sensitive Crops

Any

Questions?

R. David Myers

Extension Educator

[email protected]


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