Question - using Roundup on French broom

I've been using Roundup as part of my technique for getting rid of the French broom that's threatening to take over my hillside. I paint it on the lower stem and often abrade the lower stem to assure absorption. I then wait about a week for the glyphosate to do its dirty work on the root system, then pull the whole thing up with a weed wrench. (I'm also careful to remove any seed pods from the broom and dispose of it plastic bags.)
My question is about the concentration to use. I used the recommended dilution in the directions, which gave me a concentration of less than 1% glyphosate. Using that, I didn't really see much dieback in the broom plants after a week. I notice that Roundup that's sold for direct application has a concentration closer to 2%. Is that the concentration I should use? Perhaps stronger?
Let me know, Peter
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In article <13378f69.0308180048.2b5e7eb3
:) dilution in the directions, which gave me a concentration of less than :) 1% glyphosate. Using that, I didn't really see much dieback in the :) broom plants after a week. I notice that Roundup that's sold for :) direct application has a concentration closer to 2%. Is that the :) concentration I should use? Perhaps stronger? :) :) Unless the label of the concentrate allows a mixture higher than what you are mixing, you shouldn't make it higher. Your concentrate and the pre mixed you saw on the shelves probably have a bit different formulation make up, giving the different percentage rates for the finished product even though the end results will be expected to be the same.
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My Round Up instruction booklet says for general use against shrubs using a hand held sprayer, use a 2% solution. Same against perennials. 1% against annuals.
There are specific percentages against specific species, but broom isn't listed.
says...

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