True or False: Dithiopyr (Dimension) has both preemergence and early postemergence activity on crabgrass.

True or False: Dithiopyr (Dimension) has both preemergence and early postemergence activity on crabgrass.

• A. Only postemergence
• B. True
• C. Only preemergence
• D. False

Answer: (B)

Dithiopyr (Dimension) is valued for its ability to control crabgrass both before it emerges and soon after it has emerged. It provides residual preemergence control by preventing germination, and it also has early postemergence activity, meaning it can suppress or kill small, newly emerged crabgrass plants when applied early in the season. Because of this dual action, the statement is true. It isn’t limited to postemergence only, nor to preemergence only, which is why the other options don’t fit.

Dithiopyr (Dimension) is valued for its ability to control crabgrass both before it emerges and soon after it has emerged. It provides residual preemergence control by preventing germination, and it also has early postemergence activity, meaning it can suppress or kill small, newly emerged crabgrass plants when applied early in the season. Because of this dual action, the statement is true. It isn’t limited to postemergence only, nor to preemergence only, which is why the other options don’t fit.