A virus causing axillary bud sprouting of tobacco in Rhodesia and Nyasaland*

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Abstract
SUMMARY: A virus first found in tobacco in Rhodesia in 1958 was widespread in 1959, usually together with other viruses. It is readily transmitted by mechanical inoculation. Myzus persicae transmitted it from plants that were also infected with another virus, probably tobacco vein‐distorting virus, but not from plants infected with it alone. The aphids became increasingly likely to transmit as their feeding time on infected plants increased up to 24 hr.; after virus‐acquisition feeding times of 24–48 hr. they remained infectious for several days. The virus, named tobacco bushy‐top because of the characteristic way it stimulates the growth of axillary shoots, resembles tobacco mottle virus in many respects, and as tobacco mottle virus partially protects plants against bushy‐top virus they may be related strains.

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