AN APPLE ORCHARD SURVEY OF ORLEANS COUNTY, NEW YORK. 489 



was poor. Much of the falling of the leaves, called the " yellow leaf," 

 was due to this cause. The damage was not quite as serious as table 21 

 might indicate. The diseases that attack the tree directly, as the canker 



FIG. 168. Roxbury Russet. One of Mr. Albert Wood's "money-makers" 



and collar rot, are the worst enemies of the tree itself in orchards where 

 these diseases occur. These and a few other diseases are fully discussed 

 in Bulletin 226. 



TABLE 21. 



Principal enemies of the apple in 1904. 

 Apple-scab (Venturia inaequalis') see table under SPRAYING. 



Apple-scab on the leaves ; slight 



considerable 

 serious 



Canker (Sphaeropsis malorum) slight 



considerable 

 serious 



Collar rot slight 



considerable 

 serious 



Leaf-spot (probably Phyllosticta sp.) slight 



considerable 

 considerable to serious 



Codlin-moth (Carpocapsa pomonella) slight 



considerable 

 serious 



Leaf-blister mites slight 



considerable 

 serious 



Injuries usually slight, due to the following, were also recorded: Leaf-hopper, 

 borer, leaf-miner, leaf-sewer, bud-moth, aphid, tent caterpillar, tussock-moth, 

 tortricid, cuculio, Aspidiotus forbesi, rose bug, fall web-worm, oyster shell bark- 

 louse, woolly aphis, pink rot, San Jose scale, etc., etc. 



