“…Electron microscopy of leaf samples of cow parsley often revealed rather rigid elongate virus particles in low concentrations. The virus was Murant and Goold, 1968;Elnagar and Murant, 1976this paper Murant, 1974bWaterhouse and Murant, 1982Bos, 1985 Yamashita et al, 1976; this paper Bos et al, 1978 Shepard andGrogan, 1971;Bos et al, 1989 Severin andFreitag, 1938;Hollings, 1964;Pemberton and Frost, 1986; this paper Wolf, 1972b;this paper Bem andMurant, 1979b Bern andMurant, 1979a; see also parsnip leafcurl virus (this paper) Bern and Murant, 1979a;Murant et al, 1984; see also carrot yellow leaf virus (this paper) Bos et al, 1979 see hogweed virus 4; this paper Murant, 1972; Watson et al, 1964;this paper Murant, 1974a;Van Dijk and Bos, 1985Murant, 1974allarvirus Fulton, 1985 …”