to grapevines can range from occasional tears in leaf blades to
defoliation. Shoots and petioles become scarred. Petioles may remain
attached to shoots while leaf blades are shredded from the vine.
Damage to berries on exposed clusters during light to moderate hail
will be associated with torn leaf blades. Severe defoliation from
hail during early to midseason will typically cause a new canopy
to develop from lateral shoots. Fruit maturity will be greatly retarded
after severe defoliation. During early stages of berry development,
berries will be scarred or will die without onset of fruit rot.
Hail during or after veraison will promote fruit rot.
early-season hail damage on the Catawba variety showing scarring
on the shoots and petioles as well as an emerging lateral shoot,
which will be the source of new leaves for the vine. Photos: