My lawn (Zoysia japonica – Japanese lawn grass) is infested with a certain weed of which a picture. My lawn is about 1000 sq m and the manual fight I cannot win. Now I start to be a bit desperate. Is there anybody who knows what brand of weed killer sold in Thailand I can use to fight off this weed, of course not killing off my lawn? 

 

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The "weed" is a useful legume called Desmodium triflorum. It is a mat-forming prostrate annual or perennial legume found in lawns and heavily grazed areas throughout the tropics. If you want to kill this legume, then spray with 2,4-D. Most agricultural fertilizer stores in Thailand will stock 2,4-D under various brand names. 

Thanks for the information, Michael. I'll give it a try.