I have had mixed success with lawn sprays. No problem with roundup. I mainly use KambaM which is a selective weed spray. 100 ml to 15 lt of water 100 sq m ,with a surfactant and a dye. I have sprayed a few lawns over the past month mainly for sour grass and a few broadleaf weeds. After a week the weeds yellowed but then seemed to come back. I'm in southern Victoria, a very wet July and cold temperatures. I think my mix and coverage is correct and I'm guessing my failure is the wet conditions and cold temperatures. I sprayed on days of no rain. Maye I should start spraying in late august.
