Follow the label requirements to keep products on target
Keep a close eye on wind speed and direction while following label requirements when making herbicide applications. If you understand product requirements and use a few helpful tools, you can apply your herbicides confidently and effectively.
“Farmers should always read product labels carefully and make sure they understand requirements before using any pesticide,” says Steve Snyder, Enlist™ field specialist, Dow AgroSciences. “You need to know what crops surround your fields and whether or not they’re susceptible to the products you apply.”
Monitoring the wind
Once you get to the field where you will be making the application, measure wind speed and monitor wind direction before starting to spray and throughout the application. Don’t spray unless wind speed and direction favor on-target application.
For example, ideal conditions for applying Enlist Duo® and Enlist One™ herbicides are wind speeds of 3 to 10 mph, no higher than 15 mph. Be sure to check for any additional requirements in your state. Enlist Duo is a proprietary blend of new 2,4-D choline and glyphosate, and Enlist One is a straight-goods 2,4-D choline. Both feature Colex-D® technology, which limits drift and provides near-zero volatility after application.
A check of local weather also can help you determine if conditions are ripe for a temperature inversion. A temperature inversion occurs when a layer of warm air covers a layer of cooler air, effectively putting a lid on the surface-level air that prevents it from rising and mixing normally into the upper atmosphere. Gases trapped near the surface can’t mix and dissipate, so they hover near the ground and often drift sideways.
Very low winds (0 to 3 mph) and temperatures close to the overnight low favor the formation of a temperature inversion. Do not apply any pesticide during these conditions. The product may gather in a low-hanging cloud and can drift in any direction, potentially harming sensitive areas or susceptible plants.
Also consider the field geography. If you’re on a hill, the wind may be stronger than in a valley. A digital anemometer is a handy way to gauge winds in the field. An inexpensive wind sock provides wind direction. Keep in mind wind direction may shift during application.
Using these simple devices can save you some worry and help you apply pesticides only when conditions are favorable.
Be aware of susceptible crops AND sensitive areas
The label directions for Enlist Duo and Enlist One herbicides point out the differences between sensitive areas and susceptible crops. Snyder says it’s critical to know these differences.
Sensitive areas are those that may contain endangered or threatened species. With Enlist herbicides, you must maintain a 30-foot downwind buffer (in the direction in which the wind is blowing) from any area except:
- Roads, paved or gravel surfaces.
- Planted agricultural fields (except those crops listed in the “Susceptible Plants” section of the label).
- Agricultural fields that have been prepared for planting.
- Areas covered by the footprint of a building or other man-made structure with walls and/or roof.
Susceptible plants are those that may be harmed by a product. For instance, you can’t apply Enlist Duo or Enlist One herbicide when the wind is blowing toward susceptible crops, such as tomatoes, grapes, peppers, cotton without the Enlist trait or others listed on the label under “Susceptible Plants.” Don’t apply when wind is blowing toward a susceptible crop.
However, restrictions don’t apply to nearby crops that are not listed as susceptible on the herbicide label.
“Soybeans and alfalfa are not susceptible crops, so you can apply Enlist Duo or Enlist One with no need for a buffer,” Snyder explains. “The key is to be aware of what’s around you and be judicious about wind direction when making an application.”
Monitoring conditions and understanding the product requirements can help make accurate, effective application a reality.
To learn more about the Enlist™ system, visit Enlist.com. Find out what farmers are saying about this technology at Experiencing Enlist. Also check out our YouTube channel and follow us on Twitter at @EnlistOnline.
®™Colex-D, Enlist, Enlist Duo and Enlist One are trademarks of The Dow Chemical Company (“Dow”) or E. I. du Pont de Nemours and Company (“DuPont”) or affiliated companies of Dow or DuPont. Enlist Duo and Enlist One herbicides are not registered for sale or use in all states or counties. Contact your state pesticide regulatory agency to determine if a product is for sale or use in your area. Enlist Duo and Enlist One herbicides are the only 2,4-D products authorized for use in Enlist crops. Always read and follow label directions. ©2018 Dow AgroSciences LLC