Very damp conditions

mrsg47(7)July 23, 2013

Our miserable, humid, rainy conditions in Newport, RI this summer has for the first time created powdery mildew on my Concords grapes. Ok to use Monterey Fungi fighter on them now? thanks, Mrs. G

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ltilton

iirc Immunox is considered the fungicide of choice for PM on grapes.

    Bookmark   July 23, 2013 at 9:18PM
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Scott F Smith(6B/7A MD)

I would first check to make sure it is not downy mildew. Powdery tends to like drier weather, downy likes it wet. If you have powdery you are lucky, many things will work on it. I found summer oil to be highly effective. Downy is much harder to deal with; I used copper for downy on my organic grapes. There are also synthetics for it, mancozeb if memory serves.

Scott

    Bookmark   July 23, 2013 at 10:18PM
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mrsg47(7)

Will check on the difference of downy/vs powdery mildew. Thanks Scott and Itilton. Mrs. G

    Bookmark   July 23, 2013 at 11:01PM
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mrsg47(7)

what does iirc mean?

    Bookmark   July 24, 2013 at 8:46AM
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bamboo_rabbit(9A Inverness FL)

iirc= If I recall correctly

    Bookmark   July 24, 2013 at 8:59AM
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mrsg47(7)

Thanks, never have been into abrevs.

    Bookmark   July 24, 2013 at 7:09PM
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mrsg47(7)

Scott thanks for telling me there are two types of powdery mildew. (downy being the other). What I have are only two leaves with powdery mildew and they were not totally covered by the white powder. I cut them off and will spray with immunox after it stops raining. Raining and more rain! Two more days of the horrible rain is predicted., but, the temps dropped into the high 60's today. A twenty degree drop over night. Mrs. G ps. weather has been horrible this summer so far.

    Bookmark   July 25, 2013 at 5:27PM
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