1. Ainsworth, Ann. appl. Biol. 24: 545, 1937.
2. Ainsworth & Selman, Ann. appl. Biol. 23: 89, 1936.
3. Alexander, Meded. LandbHoogesch. Opzoek Stns Gent 27: 1020, 1962.
4. Alexander, Phytopathology 61: 611, 1971.
5. Alexander & Farley, Res. Bull. Ohio Res. Dev. Cent. 1057: 3, 1972.
6. Alexander & Oakes, Phytopathology 60: 1281, 1970.
7. Allen, Diss. Abstr. 29: B-3633, 1969.
8. Bald & Paulus, Phytopathology 53: 627, 1963.
9. Bewley, Diseases of Glasshouse Plants: 195 pp., Ernest Benn, London, 1923.
10. Boyle, Phytopathology 61: 127, 1971.
11. Boyle & Bergman, Phytopathology 57: 354, 1967.
12. Boyle & Bergman, Phytopathology 59: 397, 1969.
13. Boyle & Wharton, Phytopathology 47: 199, 1957.
14. Bradley & Harris, Virology 50: 615, 1972.
15. Broadbent, Ann. appl. Biol. 50: 461, 1962.
16. Broadbent, Ann. appl. Biol. 54: 209, 1964.
17. Broadbent, Ann. appl. Biol. 55: 57, 1965a.
18. Broadbent, Ann. appl. Biol. 56: 177, 1965b.
19. Broadbent & Cooper, Ann. appl. Biol. 54: 31, 1964.
20. Broadbent & Fletcher, Ann. appl. Biol. 57: 113, 1966.
21. Broadbent, Read & Last, Ann. appl. Biol. 55: 471, 1965.
22. Broadbent & Winsor, Ann. appl. Biol. 54: 23, 1964.
23. Caldwell, Nature, Lond. 183: 1142, 1959.
24. Caspar & Holmes, J. molec. Biol. 46: 99, 1969.
25. Christie, Pl. Dis. Reptr 53: 939, 1969.
26. Cirulli & Alexander, Phytopathology 59: 1287, 1969.
27. Clayberg, Butler, Rick & Young, J. Hered. 51: 167, 1960.
28. Clinch, J. Dept. Agric. Repub. Ire. 38: 3, 1941.
29. Clinton, Rep. Conn. agric. Exp. Stn 1907-1908: 854, 1909.
30. Crill, Burgis, Jones & Strobel, Pl. Dis. Reptr 57: 78, 1973.
31. Crowley, J. Austr. Inst. agric. Sci. 24: 261, 1958.
32. Dawson, Ann. appl. Biol. 60: 209, 1967.
33. Dawson, Rees & Short, Ann. appl. Biol. 79: 189, 1975.
34. Denby & Wilks, Can. J. Pl. Sci. 43: 457, 1963.
35. Doolittle, Phytopathology 18: 155, 1928.
36. Fletcher, Pl. Path. 12: 113, 1963.
37. Fletcher, Pl. Path. 18: 97, 1969.
38. Fletcher & Butler, Ann. appl. Biol. 81: 409, 1975.
39. Fletcher & MacNeill, Can. J. Pl. Sci. 51: 101, 1971.
40. Fletcher & Rowe, Ann. appl. Biol. 81: 171, 1975.
41. Gates & McKeen, Can. Pl. Dis. Surv. 52: 33, 1972.
42. Gooding & Hebert, Phytopathology 57: 1285, 1967.
43. Goto, Komochi & Oshima, Ann. phytopath. Soc. Japan 32: 221, 1966.
44. Hare & Lucas, Pl. Dis. Reptr 43: 152, 1959.
45. Hein, Z. PflKrankh. PflPath. PflSchutz 71: 206, 1964.
46. Henderson Smith, Ann. appl. Biol. 15: 155, 1928.
47. Henderson Smith, Ann. appl. Biol. 17: 213, 1930.
48. Hollings, Pl. Path. 6: 133, 1957.
49. Hollings, Acta Hort. 36: 23, 1974.
50. Holmes, Pl. Dis. Reptr 33: 338, 1949.
51. Howles, Pl. Path. 10: 160, 1961.
52. Jaeger, Phytopath. Z. 56: 340, 1966.
53. Jarrett, Ann. appl. Biol. 17: 248, 1930.
54. Jenkins, Wiggell & Fletcher, Ann. appl. Biol. 55: 71, 1965.
55. Jensen, Diss. Abstr. 29: B-3991, 1969.
56. John & Sova, Phytopathology 45: 636, 1955.
57. Kassanis & Selman, J. Pomol. 23: 167, 1947.
58. Kassanis & Sheffield, Ann. appl. Biol. 28: 360, 1941.
59. Kleczkowski, Virology 36: 700, 1968.
60. Komuro, Ann. phytopath. Soc. Japan 28: 40, 1963.
61. Komuro & Iwaki, Ann. phytopath. Soc. Japan 35: 294, 1969.
62. Komuro, Iwaki & Nakahara, Ann. phytopath. Soc. Japan 32: 130, 1966.
63. Kramer & Wittmann, Z. Naturforsch. 13b: 30, 1958.
64. MacNeill, Can. J. Bot. 40: 49, 1962.
65. MacNeill & Boxall, Can. J. Bot. 52: 1305, 1974.
66. MacNeill & Fletcher, Can. J. Bot. 49: 1947, 1971.
67. McRitchie & Alexander, Phytopathology 53: 394, 1963.
68. Marrou & Migliori, Annls Phytopath. 3: 447, 1971.
69. Martyn, Plant Virus Names, CMI, Kew, 1968.
70. Melchers, Biol. Zbl. 60: 527, 1940.
71. Mosch, Huttinga & Rast, Neth. J. Pl. Path. 79: 104, 1973.
72. Opel, Kegler & Richter, Acta phytopath. Acad. Sci. hung. 4: 1, 1969.
73. Oshima, Rep. Tottori mycol. Inst. 10: 771, 1973.
74. Oshima & Goto, Ann. phytopath. Soc. Japan 34: 263, 1968.
75. Oster, J. biol. Chem. 190: 55, 1951.
76. Paludan, Tidsskr. PlAvl. 72: 69, 1968.
77. Paludan, Tidsskr. PlAvl. 77: 495, 1973.
78. Pelham, Euphytica 15: 258, 1966.
79. Pelham, Ann. appl. Biol. 71: 219, 1972.
80. Pelham, Fletcher & Hawkins, Ann. appl. Biol. 65: 293, 1970.
81. Price & Fenne, Phytopathology 41: 1091, 1951.
82. Rast, Neth. J. Pl. Path. 71: 91, 1965.
83. Rast, Neth. J. Pl. Path. 73: 147, 1967.
84. Rast, Neth. J. Pl. Path. 74: 234, 1968.
85. Rast, Neth. J. Pl. Path. 78: 110, 1972.
86. Rast, Neth. J. Pl. Path. 79: 5, 1973.
87. Rast, Meded. Inst. plziektenk. Onderz. 689, 76 pp., 1975.
88. Sheffield, Ann. appl. Biol. 18: 471, 1931.
89. Schmelzer, Phytopath. Z. 28: 1, 1956.
90. Smith, Textbook of Plant Virus Diseases, 2nd Ed., Churchill, 1957.
91. Taylor, Grogan & Kimble, Phytopathology 51: 837, 1961.
92. Termohlen & van Dorst, Jversl. Proefstn Groente- en Fruitteelt Glas Naaldwijk 1958: 125, 1959.
93. Thomas, Rep. Glasshouse Crops Res. Inst. 1972: 30, 1973.
94. Tomaru, Suyama & Kubo, Ann. phytopath. Soc. Japan 36: 74, 1970.
95. Valleau & Johnson, Phytopathology 20: 831, 1930.
96. van den Brock, Vanachter & van Winckel, Agricultura, Louvain 15: 120, 1967.
97. van Dorst, Jversl. Proefstn Groente- en Fruitteelt Glas Naaldwijk 1962: 143, 1963.
98. van Regenmortel, Virology 64: 415, 1975.
99. van Winckel, Agricultura, Louvain 13: 721, 1965.
100. Wang & Knight, Virology 31: 101, 1967.
101. Warmke, Virology 34: 149, 1968.
102. Warmke, Virology 39: 695, 1969.
103. Wittmann-Liebold & Wittmann, Mol. gen. Genetics 100: 358, 1967.
104. Zitter & Murakishi, Phytopathology 59: 1736, 1969.