Abstract
Application of a half-life concept for plant pathogens to the retention of inoculativity of viruses by their vectors was tested using strawberry vein banding virus and 7 variants of strawberry mottle virus in 4 aphid vectors, namely: Pentatrichopus thomasi, P. jacobi, and 2 clones of P. fragaefolii. The results gave evidence that (1) the rate of inoculativity loss in fasting aphid vectors can be expressed exponentially and (2) the virus half-life as measured by retention of vector inoculativity is independent of vector species and independent also of vector efficiency. Thus it may be a measure of virus inactivation and an intrinsic property of the virus.
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