What insect/disease leaves peelable, brownish gray, irregular shaped, angular...

Asked September 11, 2015, 12:08 PM EDT

What insect/disease leaves peelable, brownish gray, irregular shaped, angular edged, patches on grapevine leafs? I have seen this on the top and underside of the leafs on both my vinifera and frontenac grapevines. In peeling back the patches, I do not see any insect eggs and the patch seems to peel off fairly cleanly.

Onondaga County New York grapes viticulture grape insects

1 Response

That would likely be a grape leaf miner - here's a link:
http://www.oardc.ohio-state.edu/grapeipm/grape_leaf_miner.htm
There are two types, one makes 'serpentine' tunnels (see photo in above) and another type makes round 'blotches, see:
http://cropipm.creativedonkeys.com/english/grapes/insects/leafminers.html

Neither of these causes economic injury that impacts the crop.