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[uote] could be mistaken here, but doesn't Roundup work by preventing photosynthesis? Meaning it has to be applied to green plant tissue? I was under the impression that you 'could' apply Roundup to a tree trunk all day long with little or no effect on the tree, but as soon as applied to leaves it will start to be effective. [/quote]
round-up works by blocking the formation of certain enzyme needed for reproduction of cells in the plant.
The reson cut stump application work as well as foliar application is that it is absorbed quickly into the plants vascular system. Sprayed on the trunk or soil and it the product becomes inert before is is absorbed.
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