Mrker for spot sprayer.

[ga.prime]

There's a blue dye comes in gallon jugs you can buy and add to the tank. To say that it strains your eyes to see it when you come back for the second pass would be a gross understatement.

Yep
I can't see the blue dye at all.
Imo the best way is to spray then come back in a few days and it'll be obvious what you missed.

That's my most usual method also.

 

[sstterry]

I have seen a dye you could mix in your sprayer at Tractor Supply, but I have never tried it. Believe it was blue.

I would not waste my money on this. I colors the tank but you can't see it on the plant, no matter how much you use.

 

[Jogeephus]

They make a dye, pretty inexpensive it comes in a shade of green, but a different tone thn the color of the grass. You can see what you sprayed.

I use dye but mine is blue. Blue really stands out. It really stains your clothes to so you have to be careful.

 

[bird dog]

If you are spraying with a dye, it helps if you spray a little of the grass and/or dirt around the tree. Its much easier to see than on the plant itself.
Saying that, I don't use it either for the reasons mentioned above.