Which chemical is used to control speedwell weeds?

• A. Glyphosate is used
• B. Atrazine is used
• C. 2,4-D is used
• D. Endothal is used

Answer: (D)

Speedwell in lawns is a broadleaf weed, so the weed killer chosen must target broadleaf plants without harming turf grasses when used at labeled rates. Endothal fits this need because it is labeled for turf use to control speedwell and similar broadleaf weeds, delivering effective kill while remaining safe for grasses when applied correctly. The other options either would affect the grass (glyphosate is non-selective) or are typically used in different contexts (atrazine mainly for crops like corn), or are not the recommended single-agent choice for speedwell in turf in many practice guidelines. Always follow the product label for rate, timing, and turf species to ensure proper and safe use.