Grapes Vines Curling Leaves & Little Black Spots
This is the second year for our grapevines here in central Oklahoma right on the border of zones 6 and 7. Last year we didn't have a single problem, but this year, within the last week, on 3 out of 6 of our vines, we are having leaves that are curling and then on the underside, tiny black spots. On one of those three vines, we also have "burnt" areas on the leaves. The varieties are fairly common, Ruby Red Seedless and Thompson Seedless, two were bought as more mature plants ($45 each) and the other younger ($15.)
We had major drought and high high temperatures (several days well above 110) last summer and their roots have spread wonderfully. This year, thus far, we have had right at 20" of rain in the last 90 days, with a little over half of that hitting within the last 30.....and more to come every day the rest of this week...... It has also remained slighty "cool."
I have only found one other posting similar regarding curling leaves on grape vines and it referred to possibly aphids. The black spots on the leaves are not moving and are not bumpy, more or less ingrained in the leaves. I have searched and searched the vines and find no signs of any insects with the exception of very tiny white flying things. We did apply seven dust last week, which is the only thing we've attempted thus far.
Our gardening experience is the old fashioned, trial by error method, so frankly, we probably don't really know what we are doing!!!!
Thanks is advance for any help!!!!! Photos of the leaves and vines are in the link below:
Here is a link that might be useful: Photos of Grape Vines & Leaves