Abstract
SummaryIsolates of parsnip yellow fleck virus (PYFV) from parsnip (P‐121), celery (CV506 and CV065) and Heracleum sphondylium (Hs2) were serologically close to each other but distant from isolates from carrot (Dc2 and Dc5) and Anthriscus sylvestris (A‐421 and As2), which were in turn close to each other serologically. The two groups of isolates also differed from each other in host range. Minor differences in immunological reactions and in host range and symptomatology were observed between isolates in each group. Particles of all eight isolates had similar RNA and protein compositions. The data confirm that PYFV isolates fall into two major serotypes, those from parsnip, celery and H. sphondylium belonging to the P‐121 serotype and those from carrot and A. sylvestris belonging to the A‐421 serotype.
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