Someone told me to mix some dishwashing detergent with the spray. Anyone tried this?
Yep! When we sprayed our cattails a few weeks ago we used lemon scented Joy, the cattails have browned up and died quite nicely. My thoughts are the right surfactant probably works a little better though. My best advice is
to spray first thing in the morning when there is very little wind and lot's of sunshine in the forecast, also, soak whatever you are spraying well.
AQUASTAR is a 53.8%glyphosate herbicide for use in and around water.
http://www.agrisel.com/aquastar.html http://www.cygnetenterprises.com/product/aquastar.htm