The Bulletin. 



73 



structive, diminishing tlie amount of green leaf surface, and thereby lessening 

 the vigor of the tree and its productiveness. The apple rust is responsible for a 

 great deal of the loss in sections where it prevails. This disease has a peculiar 

 history, in that the fungus wliich causes it spends its summer upon the apple, 

 causing the leaf spots, and its winter upon the cedar tree, causing the familiar 

 gall known as cedar apples. These cedar apples in the spring send out abundant 

 gelatinous horn-like projections which bear great quantities of the spores of the 

 causal fungus. These spores, borne by the winds, bear infection to neighboring 

 apple trees. It is thus seen that the apple tree is an enemy of the ,pedar tree 

 and that the cedar tree is an enemy of the apple tree, and that the two can not 

 be grown successfully near each other. The treatment to be employed against 

 this disease consists in removing, whenever practicable, all cedar trees that stand 

 near apple trees, that is, that are within a quarter of a mile of apple trees. 



LEAF SPOT. 



Apple. — Apple leaf spot is a more or less circular tan-colorod spot in the leaf. 

 It may usually be recognized easily by the fact that it is marked by several more 

 or less regular concentric circles. This leaf spot, unlike the rust, prevails in 

 greatest abundance in the western part of the State. To prevent it the trees^ 



KiG. 33 — Apple leaf spot in late stage of development, showing concentric rings. 



should be thoroughly sprayed with bordeaux mixture. One treatment should he 

 made just before the buds open, another just after the blossoms fall, and suTjse- 

 quent spraying should be given every ten to fourteen days thereafter. 



