You can t afford to let the weeds get very big, Pike says. Fourth, consider the weather. If it remains dry, this will stress weeds. Stress interferes with herbicide performance, and weed control is much reduced. That s true across the board for all herbicides.
Dust also interferes with herbicides.
Dust on the leaves tends to enhance evaporation and the crystallization of a herbicide before it enters the plant, reducing weed control. Fifth, you are probably not going to be able to use reduced rates in one field continuously. Weeds are going to escape and weed seed production may get out of hand if not watched. Sixth, avoid putting yourself in a position where resprays become necessary in fields with heavy weed pressure. THIS CAN help avoid the need for a respray.