— If 46% Glyphosate at 3 oz gal does not work, then up it to 6. Even 12 if it is 60deg or below. Be sure to include a dollop of surfactant to make it stick and not wash off in the rain.
For weeds with slippery surfaces like cattail or are resistant (sort of yellow up after spraying but do not die) add an equal amount of Mecamine with the Glyphosate
I go medieval on stubborn weeds. A cocktail of glyphosate and 2-4-D, using diesel fuel rather than water as the diluting agent (also servers as surfactant), will burn most any weed all the way to the ground. It's also effective on woody brush, sprouts, multiflora rose, and other undesirable types of scrub.
Obviously such a concoction is not something that you would want to use on your kitchen garden or around your fish pond, but it works great for fencerows, around out-buildings, etc.
I go medieval on stubborn weeds. A cocktail of glyphosate and 2-4-D, using diesel fuel rather than water as the diluting agent (also servers as surfactant), will burn most any weed all the way to the ground. It’s also effective on woody brush, sprouts, multiflora rose, and other undesirable types of scrub.
—
2-4-D is Mecamine.
Mecamine or 2-4-D is effective against everything, except grass.
Glyphosate kills everything.
Diesel fuel takes about 3 weeks to breakdown in the soil and is harmful to surrounding plants, beneficial insects, and shrubs. Which is why most commercial sprayers use water, and because water is cheaper than diesel fuel - the use of which is illegal in most states.
Real surfactants are harmless to people, plants, insects, and animals - unlike diesel - and are water fast within 15 minutes, sealing in the herbicides, preventing harm to people and animals in the area, again unlike diesel.
When spraying herbicides, you only want to kill the targeted species not harm soil organisms, beneficial insects like bees and mantises, as well other crops, shrubs, bushes, animals and people.
Above all, whatever product you are using READ THE LABEL!!! Not doing so risks killing beneficial things like bees - its failure to read and heed labels which is responsible for all bee deaths otherwise and erroneously attributed to glyphosate.