Grapevine Red Blotch Disease (GRBD)

Grapevine Red Blotch Disease (GRBD) is caused by the Grapevine Red Blotch Virus (GRBV) and affects the quality, yield, and overall health of grapevines. Infected vines often display reddening of leaf veins and interveinal areas, delayed fruit ripening, reduced sugar accumulation, and decreased anthocyanin content in berries. The virus is primarily spread through infected planting material and by the three-cornered alfalfa hopper (Spissistilus festinus), which acts as a vector in some regions. GRBD management focuses on using certified virus-free plant material, monitoring for symptomatic vines, removing infected plants, and controlling vector populations. Early detection and preventive measures are critical, as the disease can persist and gradually reduce vineyard productivity over several growing seasons.