Mosaic

Mosaic viruses cause light green to yellow mottling or streaking across the leaf surface, sometimes creating a distinctive patterned appearance. Infected leaves may become distorted, curled, or show patches of dead tissue. On hazelnuts and jasmine, you'll notice these symptoms most clearly in mid to late spring as new growth emerges. Affected plants often remain stunted compared to healthy neighbors, and the discoloration typically persists throughout the growing season.

This virus spreads through propagation of infected stock, so starting with certified virus-tested nursery material is your strongest defense. Avoid using cuttings or buds from plants showing mosaic symptoms, as this perpetuates the problem. Once a plant is infected, there's no chemical cure; remove and discard severely symptomatic plants to prevent spread to healthy neighbors. Insects and contaminated tools can spread the virus, so prune with clean tools and monitor for insects if you're working with multiple plants.