Pests and Diseases forum: Grape diseases

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Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Region: California Irises Keeper of Poultry Roses Dragonflies Birds
Bulbs Foliage Fan Photo Contest Winner: 2015
Jul 1, 2016 3:21 PM CST
I have several table grape vines that were here when I bought my property nearly 20 years ago. They've done really well until this year....

I think I have a few different things going on but am not sure exactly... I've tried doing some research, but feel it's inconclusive without someone more knowledgeable about grape diseases giving an opinion...

This first picture shows stem die back. There are "fissures" in the stems, and I don't know if this is related or not, but I found a very tiny larva moving around.. Barely visible to the naked eye.. You can also see some leaf spotting
Thumb of 2016-07-01/Henhouse/133dc5

Problem #2 is possible Downy Mildew... or Powdery Mildew?
Thumb of 2016-07-01/Henhouse/f79f86

But this is the scary one... My research brought up Esca or "Black Measles" which shows the same symptoms.. It's a big problem in Europe...
Thumb of 2016-07-01/Henhouse/89d832

Any thoughts or help would be appreciated.. I'm going to post this over in fruits and vegetables too..
When counting, try not to mix chickens with blessings.

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