Abstract
(...) Aphids probing sequentially on BYMV-Scott-infected pea tissue and then through membranes on purified virions of PMV-204-1 or clover yellow vein virus (CYVV-Pratt) transmitted PMV-204-1 and CYVV-Pratt to 35 and 45 % of test plants, respectively, indicating that an active helper component was available in BYMV-Scott-infected pea. Aphids that sequentially probed on BYMV-Scott or PMV-204-1-infected pea tissue and then through membranes on purified BYMV-Scott transmitted BYMV-Scott at very low levels (2-7 %). The specific infectivity of BYMV-Scott was lower than those of PMV-204-1 and CYVV-Pratt. Virion properties of this isolate of BYMV-Scott apparently are responsible for its lack of aphid transmissibility from single infections
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