I have had great results doing a similar application method. Cutting a 10-12 inch stem and putting it in a cup of straight glyphosate. (A small disposable plastic cup with a lid and straw hole works well.) Just stick the stem through the hole for the straw. Make sure that the cup is marked though. Certainly there is an idiot somewhere that will think, " Damn, I'm thirsty. That is one good lookin cup of something!"