Seed Transmission of Tobacco Streak Virus in Strawberry

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Abstract
Necrotic shock disease (NSD), associated with tobacco streak virus (TSV) infection of strawberry, was detected in 73 of 392 seedlings derived from crosses among strawberry cultivars when 1 or both parents were infected. Transmission rates were similar among crosses when the male parent, the female parent, or both were infected, but rates varied 0-35%, depending on the parental lines involved. Plants serving as female parents did not become infected with TSV when pollinated with pollen from TSV-infected cultivars. The virus was detected by enzyme-linked immunosorbent assay (ELISA) in small lots of ungerminated strawberry seed from crosses involving 1 or both TSV-infected parents but not from those involving healthy parents. Detection of TSV by ELISA was not influenced by surface-disinfestation of infected seed. NSD caused significant reductions in runner production and fruit yield in the patented strawberry cv Driscoll E18 in replicated field tests.

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