Abstract
Aphids (Capitophorus fragariae Theob.) allowed to feed for several days on a strawberry plant infected with yellow‐edge transmitted two virus fractions. The isolation and properties of one (virus 1) have been described previously. The other (virus 2) was separated by transferring the aphids to fresh indicators after 24 hr.Virus 2 was retransmitted after infection feeding periods of 24 hr. or more and persisted in the vector for several days. There is some evidence that it is itself a complex of viruses which can be separated further. On Fragaria vesca virus 2 produced chlorotic spotting, slight marginal chlorosis of the leaves and slight cupping of the leaflets. On Royal Sovereign strawberry it produced slight chlorosis of the young leaves.On Royal Sovereign viruses 1 and 2 together produced symptoms of yellow‐edge which is thus shown to be caused by a virus complex which can be resolved by means of the aphis vector.
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