1908.] Apple "Scab" or "Black Spot." 189 



fungus has developed rapidly and profusely (as it does) on 

 the leaves, spores are continually blown or carried during the 

 summer to the riper fruit and also to the young wood ; on 

 the latter the fungus persists in a dormant state through the 

 winter months and in the following spring restarts the disease 

 on the leaves and young fruit. 



fig. 7. — The Apple Scab or "Black Spot" fungus attacking the young wood of 

 apples : — Infested twigs of Ci Lord Suffield " ; in places the bark is beginning to peel 

 off in flakes. 



In mixed orchards and plantations those varieties whose 

 wood is liable to be attacked should be examined in the winter, 

 and if the disease is present to any serious extent the winter 

 Wash mentioned below should be applied. 



But a word of warning must be given here. It is simply a 

 waste of money to apply indiscriminately a winter-wash to a 

 large acreage of trees with the idea of getting rid of apple 

 " scab." Apple " scab " is not a disease which can ever 



