Grapevine fanleaf, an infectious degenerative disease, is the oldest known viral disease of grapevines. It is believed that fanleaf virus originated from ancient Persia and spread to other grape-growing regions via transport of vegetative propagative materials. Consequently, the disease has become established as one the most serious and devastating grapevine virus diseases worldwide. The disease can cripple infected grapevines with misshapen leaves, short internodes, zigzag growth of canes, and poor berry set. The disease also has a detrimental effect on fruit yield and quality, and longevity of the vines. All cultivars of wine grapes (Vitis vinifera) are susceptible to the […]