NOTE: In portions of the United States, numerous weed species have developed resistance to members of the sulfonylurea herbicide family (e.g. Telar, Oust, and Escort). Roadside managers are encouraged to follow these weed control practices to prevent sulfonylurea resistant weeds:
Spray equipment must be properly calibrated. A digital speed monitoring device helps maintain the correct ground speed of an application vehicle instead of relying on its stock speedometer. Spray pattern width should be continually monitored throughout the application. Spray pattern bending (distortion) because of excessive ground speeds or wind will shorten spray widths and cause over-application. Always use drift control as recommended by each herbide label.
Most herbicides should not be treated to drought stressed turf. Excessive turf damage and reduced weed control often results.
Table 2. Spray Additives (23 KB, PDF)
Table 3. Guide to Woody Plant Response to Herbicides (42 KB, PDF)