ILLUSTRATIONS xix 



i-IG. PAGB 



68. Dead-arm on grape-canes (courtesy of Donald Reddick) . . 256 



69. Rot of grapes caused by the dead-arm fungus (after Gregory) . 257 



70. Dead-arm ; fruiting bodies of the fungus (courtesy of Donald 



Reddick) 258 



71. Peach brown-rot . . - . 271 



72. Brown-rot canker, orchard appearance (after Jehle) . . . 272 



73. Brown-rot canker on peach-limbs (courtesy of R. A. Jehle) . . 273 



74. Apothecia of the brown-rot fungus . . . . . . 274 



75. Peach leaf-curl 279 



76. Peach-yellows, affected fruit 284 



77. Peach-yellows, orchard appearance (after Douglass) . . . 285 



78. Peach-scab . . . 295 



Frost-injured peach -trunk 299 



Frost-injured peach-limb . 299 



Black-spot on peach-leaves (after Rolfs) 308 



Coryneum-blight on fruit of peach (after Jackson) . . . 313 



Powdery-mildew on peach-leaves and shoots (after V. B. Stewart) 316 



Powdery -mildew on peach-fruits 317 



85. Fire-blight of pear ; blossom-blight and canker .... 325 



86. Twig-blight of pear . . . . . 326 



87. Hold-over canker of pear . 326 



88. Hold-over canker 327 



89. Oozing blight-canker 328 



90. Fire-blight on apple-fruit 329 



Fire-blight on pear-fruit . . . 329 



Pear-scab 333 



Pear leaf-spot 338 



Eastern pear-rust (after F. C. Stewart ) 343 



Pacific Coast rust on pear-leaves (after Jackson) . . ^_ . 345 



Pacific Coast rust on pear-fruit (after Jackson) .... 346 



Pacific Coast rust on incense cedar (after Jackson) . . 346 



Leaf -blight on pear-fruit . . 349 



Plum brown-rot . 355 



Black-knot ; young swellings on buds 358 



Black-knot ; one-year-old knot 359 



Black-knot ; two-year-old knot 360 



Black-knot; cross-section of a knotted twig . . . . .361 



Black-knot ; cross-section of a diseased twig 361 



Plum leaf-blight 364 



Black-spot on plum-leaves (after Rolfs) 366 



