Which product provides quick initial knockdown but requires repeat applications for control?

Which product provides quick initial knockdown but requires repeat applications for control?

• A. Solitaire
• B. Diquat
• C. Finale
• D. Roundup

Answer: (A)

Solitaire is a brand of diquat-based herbicide that acts as a contact killer. It hits the weed tissue on contact and causes rapid scorch, giving quick initial knockdown. But it has little to no soil activity, so it doesn’t provide lasting or residual control. As a result, weeds can regrow or new weeds can emerge after the first treatment, making repeat applications necessary to achieve ongoing control. This combination—fast visible kill with no residual effect—is exactly what this question is testing.

Solitaire is a brand of diquat-based herbicide that acts as a contact killer. It hits the weed tissue on contact and causes rapid scorch, giving quick initial knockdown. But it has little to no soil activity, so it doesn’t provide lasting or residual control. As a result, weeds can regrow or new weeds can emerge after the first treatment, making repeat applications necessary to achieve ongoing control. This combination—fast visible kill with no residual effect—is exactly what this question is testing.