In article >, "Ken Anderson" > wrote:
>I emptied my 12 volt sprayer of broadleaf weedkiller, then put in Mancozeb. I
>sprayed on the ground until I was sure the yellow Manc was coming out, then
>proceeded to spray my grape vines. Damned if the first vine or two didn't get
>damaged. I'm dumbfounded that there was enough weedkiller residue left in
>there to do this. Hopefully, they'll recover. So, I pass my experience
>along. A word to the wise.
>Ken
>

That's why we use two different sprayers: one for herbicides, and one for
everything else (fungicides, dormant oil spray, insecticides, etc.).