This map can be found at: http://maps.oda.state.ok.us/pslvags/
It is a simple map to navigate around, but if you have problems, or do not have internet access, your local county extension educator can get the site up on his office computer and help you with your pesticide application decisions.
Another way to reduce risk to neighboring crops is to follow best management practices like the ones listed below. These practices will help producers avoid off target movement of herbicides in sensitive areas:
Best Management Practices.
1) Select an herbicide that is low volatile or non volatile. Volatilization is the movement of chemicals through the air in a gaseous form, usually following wind movement. When you can smell perfume coming off of the lady five rows over from you in church, this is an example of volatilization. Herbicide labels will warn you of possible volatility concerns so be sure and read that label.
2) Check the ODA map mentioned above for any sensitive crops or herbicide cutoff dates in your area.
3) Use spray equipment, application pressures and spray nozzles that produce droplet sizes that are greater than 200 microns. This information is readily available in sprayer parts manuals that sell nozzle tips or from extension publications via the internet.
4) Avoid perfectly calm days. Calm winds can lead to temperature inversions that can move small herbicide particles long distance. Inversions occur during calm conditions when there is little air mixing. Basically small droplets can hang in the air as a concentrated cloud that can then move to adjacent areas once the wind picks up. A light wind causes enough mixing in the atmosphere to keep this cloud dispersed.
5) Only spray when winds are 10 MPH or less. When the wind speed doubles, research indicates that there is a 700 percent increase in drift, when readings were taken 90 ft. downwind of the sprayer.