A. Raspberries are subject to several diseases, the most common of which is a mosaic virus.

These include mosaic virus, mildew and anthracnose.

When researchers delved into this peculiarity, they found that the mottled effect was not in the breeding, but was caused by the mosaic virus.

"What is mosaic virus?"

Under the "interesting" heading would fall the mosaic virus, which produced the fantastically variegated tulips of the tulipomania investing craze in 17th-century Holland.

Early last century the United States had 60,000 acres of raspberries, three times the current figure, before mosaic virus devastated plantings.

What wasn't understood was that this stunted growth and fragmentation of color were due to a mosaic virus, with aphids as the conducting agent.

Hop mosaic virus (HpMV) is a pathogenic plant virus.

Examples are the mosaic viruses, which produce a mosaic-type effect on the leaf surface or the citrus variegation virus (CVV).

This high-yielding variety is resistant to fiji and mosaic viruses, and produces more sucrose than other varieties.