Quote Originally Posted by olduckhunter View Post
i use roundup. my string never runs out.
Actually, it does run out. Weeds are starting to build up a resistance to roundup and other surfactants. The big chemical companies are looking for something to replace it, before weeds build a complete resistance to it.

Having the same problem with pour-on Ivomec to worm cattle. They say it won't be long before it's obsolete too.