Insect and Disease Control 265 



buds. This may occur first on a part of the tree as on a 

 single branch, on several branches, or the entire tree may 

 become affected at once. The rosettes consist of short 

 branches two or three inches long, one of which grows from 

 each bud, and a large number of small yellowish green leaves 

 are borne on each branch thus making a sort of ''tuft." 

 If an entire tree is thus affected, it dies before growth begins 

 the next season. If only a part of the branches are diseased 

 the first season, those die before the opening of the second 

 season. The remainder of the tree then develops the trouble 

 the second season, dying in a corresponding period of time. 



When a whole tree is affected at the same time, it does 

 not mature fruit even if it sets. Healthy branches of an 

 affected tree mature normally any fruit they may bear. 



Means of control of rosette. 



As with other diseases of this obscure group, the one 

 known method of control is to dig up rosetted trees and 

 burn them at the first symptom of the trouble. Other- 

 wise it will spread to other trees. 



Shot-hole, leaf-blight, leaf-spot 



The plant pathologists recognize several different fungi 

 as the causal agents of certain types of injury to peach 

 foliage, the characteristic effects of which have given rise 

 to the common names applied. It is not important, how- 

 ever, from the peach-grower's standpoint that he be able 

 to distinguish these different fungi one from the other, 

 since as far as known they do not require individual treat- 

 ment for a good measure of control. They are more serious 

 on other stone-fruits, especially the cherry and plum. 



