Seasonal
development and life cycle—Strawberry virus diseases
A number of virus diseases may affect strawberry plants. Most are spread by insects, and all can
be spread during vegetative propagation of planting material. These pathogens are microscopic organisms
that multiply inside living host cells and spread throughout infected strawberry plants and their
daughter plants.
Often the only effect of infection by a single virus is reduced plant vigor and fruit yield. A
strawberry plant usually must be infected by more than one type of virus before visible symptoms
develop, and
yield reductions are more severe when more than one kind of virus is present. It usually takes
more than 2 years in the field for the incidence of viruses to reach a level where multiple infections
become significant. | 
Strawberry
aphids transmit many viruses |
