1106 



THE FRUIT INDUSTRY IN NEW YORK STATE 



DISEASES 



In Xew York State the peach is subject to nine maladies, seven 

 of which are distinct diseases. The natural order of these so-called 

 diseases are crown gall, powdery mildew, peach spot, or scab, shot 

 hole of peach foliage, brown rot, peach leaf curl, yellows, little 

 peach and frost injury. 



FIG. 352. CROWN GALL, ILLUSTRATING ITS 

 APPEARANCE ON DIFFERENT TREES AND 

 PLANTS 



Crown Gall 



Peaches are subject to various gall-like formations. They are 

 known as root knot, aphis galls, and the true crown gall. The 

 first is caused by an eel worm or nematode,* the second by the 

 black peach aphid, and the third by a parasitic organism. Crown 



* Farm Bui. 33, 1805, U. S. Dept. of Agr. 



