Scab 



161 



velvety patches. It not only injures the appearance of the 

 fruit, but by its attacks on the foliage, it may prevent the 

 formation of a crop of fruit. 



Apple leaves covered with the fungus that causes scab. 



It is most serious when the weather is cold and wet. 

 early in the season. Because of this the dropping of 

 apples, which is often attributed to improper pollination 



(6) 



