The current results help corn producers inTurkey to improve the cost effectiveness and efficacy of their weed management programs. The main practical implication of this that weeds must be contrilled from the V1-V12 stages for field corn,VE-V10 stages for popcorn, and V2-V10 for sweet corn in order to prevent more than 5% loss in crop yields. Our findings are valuable for growers in optimizing the timing of weed control as well as in developing an integrated weed control strategy.