Diseased Cabernet Sauvignon leaves

Asked May 7, 2020, 6:44 PM EDT

1 of my 38 backyard vines is diseased, but what is it? Leaf growth is stunted, and even in the big leaves their texture is ruddy. My fungicide is Regalia. Any ideas?

Orange County California

2 Responses

Grapes are very sensitive to herbicides and this looks a bit like herbicide injury. Your best bet is to contact your extension office and see how they might process "disease" samples.
South Coast Research and Extension Center
7601 Irvine Blvd.
Irvine, CA 92618
Phone: (949) 653-1809
Email: ceorange@ucdavis.edu

OK, thank you very much for the referral.