With the early spring, and now a good shot of rain, it is a good idea to make sure you are applying the proper rates of residual herbicides. Half rate pre emerge programs that have worked in the past, when a shorter window of control was needed, may not provide enough control if spraying is taking place earlier and weed pressure is heavier. Prevent plant fields generally have higher weed pressure since timely weed control wasn't an option last year. A solid pre emerge program is the best way to avoid resistant weeds, extend your post spraying window, and maximize profitability on every acre.