1. Allen, W.R., Davidson, T.R. & Briscoe, M.R. (1970). Properties of a strain of strawberry latent ringspot virus isolated from sweet cherry growing in Ontario. Phytopathology 60, 1262–1265.
2. Atchinson, B.A. & Francki, R.I.B. (1972). The source of tobacco ringspot virus in root—tip tissue of bean plants. Physiol. P1. Path. 2, 105–111.
3. Bancroft, J.B. (1968). Tomato top necrosis virus. Phytopathology 58, 1360–1363.
4. Bancroft, J.B. & Lane, L.C. (1973). Genetic analysis of cow—pea chlorotic mottle and brome mosaic viruses. J. gen. Virol. 19, 381–389.
5. Bol, J.F., van Vloten—Doting, L. & Jaspars, E.M.J. (1971). A. functional equivalence of top component a RNA and coat protein in the initiation of infection by alfalfa mosaic virus. Virology 46, 73–85.