CONTENTS. 23 



CHAPTER XIII. 



THE DISEASES OF FRUIT-BEARING PLANTS. 



Section I. General observations — Berkeley's theory of classification — ' 

 Weigmann — Causes of disease — Insects. Section 11. Diseases of 

 the apple — of the leaf — Fall of the leaf — Fungi — Clados porium 

 dendriticum, ceratites, raestelia — Insects — Apple-tree louse, com- 

 mon apple-tree caterpillar, the oak-tree caterpillar, the vaporer moth, 

 the palmer worm, the hag moth, the unicorn moth, the canker worm, 

 the handmaid moth, the dotted apple-leaf worm ; of the fruit and 

 flower — Sterility — Immaturity of the fruit — Insects — The saw- 

 fly, the midge, the codling moth, the rose-bug ; of the stem — Insects 

 — The goat moth, the common borer, root-blight insect, the snapping 

 beetle, the bark louse, the locust of the seventeenth year; of the 

 tree generally — Profusion of sap, hunger, stagnation from transplan- 

 tation, canker, freezing, splitting, wind shakes, dropsy, sun-strokes, 

 wounds, lichens, vitiation of the sap. Section III. Diseases of the 

 pear — Of the leaf — Amerioan pear blight — Insects — The gold- 

 smith beetle, the red mite, the fly, the lyda, the astyages, the hispa 

 quadrata, fungi, discolorations ; of the fruit and flower — Eotting at 

 the core, induration, loss of bloom, etc. ; of the stem — Root blight — 

 Insects — The blight beetle, the bark louse, fungi, etc. Section IV. 

 Diseases of tlie peach — The dotted apple-leaf worm, premature fall 

 of the fruit, the borer, gumming, etc. Section V. Diseases of the 

 plum — Plum louse, curculio, the plum wart, etc. Section VI. 



