ILLUSTRATIONS. 



Page. 



Plate I. Apple blotch on fruits, twigs, and leaf Frontispiece. 



II. Fig. 1. — Orchard of Northwestern Greening apple trees almost 

 destroyed by apple blotch. Fig. 2. — Six Ben Davis apples, show- 

 ing the character of the disease on young fruit 26 



III. Microscopic and cultural characters of the apple-blotch fungus 26 



IV. Fig. 1. — A Ben Davis apple, showing blotches produced by inocu- 



lation. Fig. 2. — A Gano apple, showing blotches resulting from 

 natural infection. Fig. 3. — A pow T er spraying outfit in operation. 26 

 V. Fig. 1. — Crop of Ben Davis apples from a properly sprayed tree. 



Fig. 2. — Crop of Ben Davis apples from an unsprayed tree 26 



VI. Fig. 1. — Crop of Limbertwig apples from a tree sprayed three times, 

 beginning at the right period. Fig. 2. — Crop of Limbertwig 

 apples from a tree sprayed three times, beginning too late 26 



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