Which product is not effective on crabgrass?

• A. Gallery.
• B. Barricade.
• C. Pendimethalin.
• D. Betasan.

Answer: (A)

Understanding how crabgrass is controlled in turf comes down to preemergent herbicides that create a barrier in the soil to stop the seeds from germinating. Barricade (prodiamine), Pendimethalin, and Betasan (bensulide) are classic preemergents that are labeled for crabgrass control, so they are effective choices for preventing crabgrass from germinating.

Gallery, on the other hand, is not labeled for crabgrass control in most turf situations. It doesn’t provide the preventive action against crabgrass germination that those other products do, so it’s not effective for that purpose. That’s why Gallery is the correct answer to this question.