Grape clusters shrinking?

Asked August 6, 2017, 4:59 PM EDT

Hi, I have a small Vineyard in Fulton. Within the last 2 weeks I've noticed several vines with bunches that seem to be shrinking, and splitting of the grapes. I've tried dusting with sulfur spray to control mildew earlier and now the clusters of grapes look grayish and aren't thriving. I don't know what to do or what's wrong.

Also seeing some leaves change colors, with red splotches, and falling off. Can you help? Kathy

Sonoma County California

2 Responses

Hello Kathy,
Please contact our Viticulture Advisor, Rhonda Smith at rhsmith@ucanr.edu
Please include the photos and background information you included here.
Thank you, Karen

In addition, you might want to look at our Red Blotch photos and compare them to your leaves. The photos are listed by varietal. I don't know if that's what this is, but the leaves look similar.
About Red Blotch
Photos of sympotomatic Red Blotch