DISEASES INJURIOUS TO FRUITS. 



83 



Brown Rot of the Plum (Sclerotinia fructigena) is a common 

 and serious cause of loss. See Brown Rot under the head of 

 peach. 



Shot Hole Disease. This may 

 be caused by any of the several fungi 

 or even by spraying injuries. Any 

 of these causes may destroy the foli- 

 age in spots; after the deadened tis- 

 sue drops out the shot-hole appear- 

 ance is produced. 



Crown Gall is the name given 

 to a morbid growth wnich general- 

 ly takes place near tne surface of 

 the ground. It is of a spongy na- 

 ture and often spherical in rorm. The 

 same disease or class 01 diseases 

 also attacks the peach, raspberry, 

 blackberry, apple ana other trees. It 

 is most commonly injurious to trees 

 growing in the nursery. All stocks 

 showing it should be regarded with 

 suspicion. 



Scab of plums (Cladosporium 

 carpopJiyllumJ causes dark, hard spots in the skin of the fruit. 

 It may be prevented by spraying with weak Bordeaux mixture. 



Diseases of the Peach. 



Brown Rot (Sclerotinia fructigena). This disease principal- 

 ly attacks p-eaches about the time the fruit begins to ripen and 

 often spreads rapidly. It also causes decay in the fruit after 

 it is picked, and is likewise one of the most injurious foes of 

 plums and cherries, as well as of the peach, while apples, pears 

 and quinces are sometimes injured by it. It sometimes destroys 

 the young growth. If the diseased fruit is allowed to remain 

 on the tree it dries up and does not fall off. The fungus passes 

 the winter in the diseased branches and also in the dried fruit. 

 In the spring these send out spores which start new centers of 

 infection. 



Remedies. The diseased dried fruit should be removed 



Fig. 



35. Black knot of 

 plum. 



