you can use copper sulfate, it is inorganic and very cheap in HD

derectly inject to the bottom of the trunk. it is not a big deal. and won't be toxic to anything.
you can find it in plumbing area, it is used for clean out the root in the sewer pipe line.

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• thanks thanks -众生1- ♀ (0 bytes) () 10/22/2013 postreply 14:20:21

• 回复：you can use copper sulfate, it is inorganic and very cheap in -rondo- ♂ (99 bytes) () 10/22/2013 postreply 14:46:05

• 把树根钻个小洞，往里面塞明矾，很快就呜呼了。 -888891- ♂ (0 bytes) () 10/22/2013 postreply 16:41:48