DISEASES OF CROPS 



205 



QUINCE 



Rust (G. clavipes, C. and P.). This disease is very similar to the rusts 

 on apples and pears, but is more severe on the fruit and twigs than on either 

 of the preceding. It also has the cedar for its alternate host. 



Blight. See Pear. 



Leaf Spot. See Pear. 



Rots. See Apple. 



Crown Gall. See Apple. 



PEACH 



Brown Rot (Sclerotinia fructigena [Pers.], Schroet.). This is one of 

 the most destructive diseases of the peach. It attacks the fruit as 



PEACHES ENTIRELY DESTROYED BY BROWN Ror. 1 

 Showing gray masses of spores of fungus. 



it is approaching maturity, causing it to rot, become brown, soft and use- 

 less. The fungus produces an abundance of spores which form a dense 

 brown, powdery mass over the fruit. It also attacks the blossoms, causing 

 them to die, turn brown and fall soon after opening. It then spreads to the 

 twigs, causing death of the young shoots and causing cankers on the older 

 branches. 



Treatment. See spray table for peach. 



Scab or Freckles (Cladosporium carpophilum, Thuem.). This extremely 

 common disease attacks the fruit, causing sooty, black specks or blotches 



* From Farmers' Bulletin 440, U. S. Dept. of Agriculture. 



