xviii ILLUSTRATIONS 



FIG. PAGK 



29. Fly-speck of apple 106 



30. Crown-gall on apple-roots (courtesy of V. B. Stewart) . . . 109 



31. Hairy rroot of apple (courtesy of V. B. Stewart) . . . .110 



32. Apple pink-rot .118 



33. European apple-tree canker 127 



34. Superficial bark-canker 131 



35. Spongy dry-rot 133 



36. Hypochnus leaf-blight pathogene (after Stevens) .... 135 



37. American brown-rot of apple- fruit 141 



38. European brown-rot canker of apple 143 



39. Rough-bark canker 145 



40. Phytophthora-rot of apple 152 



41. Coryneum blight of apricot-fruit -155 



42. Coryneum blight of apricot-leaves 155 



43. Apricot-rust 156 



44. Black-spot on apricot-leaf 158 



45. Blackberry crown-gall 161 



46. Blackberry leaf -spot . 167 



47. Brown-rot on cherry 171 



48. Cherry leaf-blight ....... f ~^ . 173 



49. Powdery-mildew of cherry; healthy and diseased shoots (after 



V. B. Stewart) 178 



50. Cherry bacterial-guinmosis (after Barss) 183 



51. Witches'-broom on cherry (after*F. C. Stewart) . . . .189 



52. Cranberry-scald (after Shear) ........ 193 



53. Currant leaf-spot 204 



54. Currant anthracnose 207 



55. European currant-rust, uredinia 214 



56. European currant-rust, telia . 215 



57. European currant-rust, secia (courtesy of L. A. Zimm) . . .216 



58. Gooseberry leaf-spot 226 



59. Black-rot on grape-berries (courtesy of Donald Reddick) . . 232 



60. Black-rot on grape-leaf (after Reddick) 233 



61. Downy-mildew on grape-leaf 238 



62. Downy-mildew on grape-shoot (courtesy of C. T. Gregory) . . 239 



63. Downy-mildew on grape-berries . . . . . . . 240 



64. Anthracnose on grape-canes (courtesy of Donald Reddick) . . 250 



65. Anthracnose on grape-berries (courtesy of Donald Reddick) . . 250 



66. Crown-gall on grape-cane (courtesy of Donald Reddick) . . 254 



67. Dead-arm of grape (after Reddick) . . ""~. ; . . . . 255 



