Don't do it. Find another fungicide for PM

Consider using captan plus sulfur.

Oil plus captan or oil plus sulfur will damage the foliage. Don't mix them and don't apply them separately unless the proper time interval has elapsed. Captan alone can injure some grape varieties.

" Doesn't specify a safe interval."

Generally a couple weeks is the recommended interval b/t captan and oil. That said, some foliage is more sensitive than others. You might experiment on a small part of the foliage first.

Thanks for suggestions. Cannot use sulfur, have concord. Will try find something else.

We have alternated Green Cure (potassium bicarbonate) followed by captan with no problems. The application intervals have been variable, but may have been as short as a few days. We have never tank mixed them,

Green Cure is for powdery mildew ONLY. It is not a protectant - it has no residual effect at all. It kills powdery mildew on contact. So you have to scout your vines and use it as soon as the PM shows up. It does nothing about the other two major grape diseases.

This post was edited by nickl on Wed, Aug 7, 13 at 15:26

tigrikt, do your grapes still get PM after applying immunox?

I used it earlier this season on my curcubits and found that the systemic presence has persisted and prevented the disease.

Itilton,
Dont see any so far. Frequent rains help too.
Just considering my options for the rest of the season, just in case. I used Immunox mostly for Black Rot in Grapes and with all that rain got overly entusiastic.

Nickl, thanks on Green Cure. Will use it as an eradicant then. I have table grapes, the harvest is soon.

This post was edited by tigrikt on Wed, Aug 7, 13 at 19:48

Some info here

Here is a link that might be useful: Page 37

This post was edited by tigrikt on Wed, Aug 7, 13 at 21:34

Some info

Here is a link that might be useful: Page 33

Some info

Here is a link that might be useful: Scroll down to the end of the page

Good information, thanks.

For Future References

Here is a link that might be useful: Grape Injury from Captan Mixed with Oil-containing Products