Raspberry bushy dwarf virus (RBDV) is a plant

Plant

Plants are living organisms belonging to the kingdom Plantae. Precise definitions of the kingdom vary, but as the term is used here, plants include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The group is also called green plants or...

 pathogenic virus

Virus

A virus is a small infectious agent that can replicate only inside the living cells of organisms. Viruses infect all types of organisms, from animals and plants to bacteria and archaea...

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Causes

RBDV is usually transmitted through infected pollen

Pollen

Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes . Pollen grains have a hard coat that protects the sperm cells during the process of their movement from the stamens to the pistil of flowering plants or from the male cone to the...

. Insects that feed from infected bushes are also capable of spreading the infected pollen.

Symptoms

Infected bushes are not bushy nor small, rather the fruit is crumbly and in much reduced yields. Infection usually means the bush needs to be replaced as the virus stays in the host for a lifetime.