Freeze killed vines will sprout out at the base of the vine. The first leaf symptoms usually do not appear until June or July. Drought will speed up the leaf symptoms. This symptom is non-uniform marginal leaf necrosis. Red varieties usually have a bright red transition color between the healthy green leaf tissue and the dead brown tissue.
White varieties have a yellow colored transition front.
Leaves in the fruiting zone tend to show the symptoms first. In July and August leaf blades will fall from the shoot with the leaf petiole remaining on the shoot. The petiole is the leaf stem. Shoots on a PD vine will have several of these petioles without blades. As the shoot matures, PD vines will have both green and brown colored stem color.