1. UC IPM
A Chardonnay leaf that prior to the normal time of fall color has bright yellow between the veins and margins that have rolled downward due to leafroll caused by one or more <i>Grapevine leafroll associated viruses</i>.
A Chardonnay leaf that prior to the normal time of fall color has bright yellow between the veins and margins that have rolled downward due to leafroll caused by one or more Grapevine leafroll associated viruses.
Credit: Jack Kelly Clark