CONTENTS 



CHAPTER I 



PAGE 



APPLE DISEASES 1 



Apple-scab 3 



Bitter-rot 14 



Fire-blight 21 



Stippen, or bitter-pit 23 



Frost-injury 35 



Black-rot canker 45 



Blotch 57 



Rust .; . -63 



White heart-rot - .72 



Blister-canker 76 



Northwestern anthracnose 81 



Fruit-spot 87 



CHAPTER II 



APPLE DISEASES concluded 91 



Soft-rot, or blue-mold 91 



Annillaria root-rot - .96 



Clitocybe root-rot . - 102 



Sooty-blotch and fly-speck 104 



Crown-gall . 108 



Powdery-mildew 113 



Pink-rot ... .. . 117 



Water-core 12 



European apple-tree canker . . - . . 125 



Superficial bark-canker . .... . . . .130 



Spongy dry-rot . . / . . ....... 132 



Hypochnus leaf -blight . . . . . 135 



Jonathan-spot . . . ..... ... 137 



ix 



