8ob
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- Nescient in the vale
Weedkiller questions have been beaten to death on here 
A few things come to mind. The strength of the weedkiller for one, there are a lot of weedkillers quoteing the "360" or "480+" concentration but that is only a small part of the whole picture, keeping it on the leaf is another whole science, a lot of folk have had good results using thickeners like washing up liquid or wall paper paste, some spray off a plant then drop a bag over it and tie off at the base. Applications and its economical use is important,spot spray rather than blanket spray, all to easy to get carried away with this stuff. Last is why leave it until its got out of hand
Bob

A few things come to mind. The strength of the weedkiller for one, there are a lot of weedkillers quoteing the "360" or "480+" concentration but that is only a small part of the whole picture, keeping it on the leaf is another whole science, a lot of folk have had good results using thickeners like washing up liquid or wall paper paste, some spray off a plant then drop a bag over it and tie off at the base. Applications and its economical use is important,spot spray rather than blanket spray, all to easy to get carried away with this stuff. Last is why leave it until its got out of hand

Bob