So I've got 27 vines of marquette but every year without fail the leaves seem to become diseased despite maintaining a strict fungicide (mancozeb) spray schedule. I'm not sure what the culprit is... pictures posted below in case anyone has any insight.
I used to have a section of traminette but the disease got so bad the vines weren't viable so I had to pull them. Unfortunately I have no agricultural expertise...
I used to have a section of traminette but the disease got so bad the vines weren't viable so I had to pull them. Unfortunately I have no agricultural expertise...