Leaf puckering

[Marctee]

I've noticed some leaves on two different varieties showing some puckering. Is this familiar to anyone? I'm wondering whether it represents some nutrient deficiency.

 

[Jericurl]

I don't grow grapes so I don't have any real advice to give you.

I did find this article which may give you some direction:
http://xtremehorticulture.blogspot.com/2013/06/grape-leaves-cupping.html

Also, try googling drawstring effect on leaves, etc.

 

[Pat57]

Did you happen to fertilize recently? They almost look like they got too much nitrogen.

 

[terrymck]

What I noticed is that you have no Japanese beetle damage. Those leaves look good!

 

[Marctee]

Too much nitrogen, hmmm. We are not fertilizing, only using yellow clover and black medic as nitrogen fixing cover crops, and a scoop of home-cured compost once a year.

No Japanese beetles in these parts.

 

[Masbustelo]

Was it extremely hot when the leaves were small?

 

[garymc]

2, 4-d can cause cupping between the veins of the leaves if you've gotten some drift. It's a common ingredient in weed'n feed lawn weed killers. Grapes are very sensitive to it and it has a volatility characteristic that makes it difficult to avoid. It can be sprayed or used in granules and the next day if there is dew and humidity conditions it can form a vapor that will drift great distances. Another symptom is that the margins of new leaves will have little finger like protrusions.