DISEASES INJURIOUS TO FRUITS. 



79 



Remedy. Spraying with Bordeaux mixture is the only 

 known satisfactory remedy. Several sprayings are usually neces- 

 sary where this disease is w-ell established. A winter spray 

 with strong Bordeaux mixture before the buds open is recom- 

 mended, followed by two or three sprayings after growth has 

 started, at intervals of from two to three weeks. Good ventila- 

 tion and proper spacing of trees aid very materially in avoiding 

 conditions favorable to fungus growth. Burning or plowing un- 

 der the diseased leaves which have fallen will also aid in stamp- 

 ing out this disease. 



Powdery Mildew (Podosphaera leucotricha). This mildew 

 seldom injures apples except young plants in seedling beds 



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Fig. 32. Apple infested with scab. 



or nursery rows. It is most injurious to seedlings in their first 

 year, especially when severely crowded. 



Remedy. This disease may be prevented by spraying with 

 Bordeaux mixture, commencing in the early summer and re- 

 peating at intervals of about two weeks. 



Fruit Scald. This occurs most commonly on apples that 

 are kept in cold storage. Some varieties with tender skins 



