If you rinse 3 times like was previously suggested you should have no
problem. Also spray through the hose to make sure the stuff is rinsed
out of it also. NEVER use 2,4-D around grapevines. It's one of the
worst things you can do. I use Roundup at half the recommended WEAKEST
strength (iow, 1/2 THE DOSAGE RECOMMENDED FOR THE EASIEST TO KILL
WEEDS) and it seams to do well it just takes longer. Using Roundup
before bloom is "safer" because the vine PHYSIOLOGICALLY isn't flowing
down towards the roots yet. All the activity is flowing out to the
buds so the stuff isn't taken into the vine as readily. After bloom
I'd use a "knock down" for weeds NOT Roundup. If the vines are mature
( 3 years or older) you can use Preen (Trefuralin sp?) , known also as
simazine, to keep weeds from germinating (PRE-EMURGENT).

Bob

(Doug Miller) wrote in message y.com>...
> 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.).