RATIONAL FRUIT CULTURE. 69 



if the leaves drodp, or wither, the cause may not be in them, 

 but in the stem or the roots. For the purpose of identifica- 

 tion, therefore, it will be best to give a list of the principal 

 diseases under the symptoms most likely to attract attention, 

 and then, for easy reference, to take them in alphabetical 

 order. 

 FUNG0ID DISEASES OF FRUIT TREES ARRANGED ACCORDING 

 TO SYMPTOMS. 



Foliage Affected:— 



Blotched (dark) under the skin, which afterwards 



breaks (Apple and Pear scab — see Fruit). 

 Blotched (olive-green) on the surface (Brown rot — 



see Fruit). 

 Blotched (red) and blistered (Peach Leaf-curl). 

 Spotted (reddish) , afterwards holes, leaves falling 



early (Plum-Leaf blight). 

 Spotted (reddish) on lower surface, no holes, falling 



early (Plum-Leaf rust) . 

 Spotted (brown, small, numerous) on both surfaces,' 



then holes (Shothole fungus). 

 Whitened (very pale, yellow or white) . (Chlorosis) . 

 Whitened (only upper surface) (Silver leaf). 

 Whitened by powder (Mildew). 

 Withers and hangs (Cherry-Leaf scorch). 

 Withers and falls, young trees (Stem Disease — see 



Stem) . 

 Withers 'and falls, older trees, red globules on bark 



(Coral-spot disease). 

 Droops and turns yellow (Tree-root rot — see Stem) . 

 Fruit Affected:— 



Blotched and cracked (Apple and Pear scab). 

 Blotched brown; then grey tufts; fruit mummified 



(Brown rot). 

 Malformed and wrinkled (Plum-pockets). 



