DISEASES OF PLANTS— SPRAYING 



227 



skin and flesh are spotted and blotched with red, the flavor 

 being bitter or insipid. The best remedy is to cut out the 

 diseased tree as soon as detected, and burn it. Disinfect 

 instruments used to help prevent spread to healthy trees. 



Little=Peach. — This disease of the peach is somewhat 

 like yellows, the leaves becoming yellowish-green and drop- 

 ping as in yellows. But there is one important difference. 

 Instead of appearing ripe too 

 early, the fruits remain very small 

 and are green much too long. 

 (See Fig. 146.) The diseased 

 trees should be burned as in the 

 case of yellows. 



Apple Scab. — This disease of 

 the apple is very bad in nearly 

 all regions where the crop is 

 grown for market. It is very 

 similar to the scab disease found 

 on pears. It attacks both leaves 

 and fruit. This disease appears at 

 blossom time and soon after, caus- 

 ing large numbers of the small 

 apples to drop from the tree. 

 The fruits that cling on may be- 

 come affected and will be small, 

 irregular, rough, and blotched. 

 Irregular, roughened, brown 

 spots, more or less running together, are formed on the sur- 

 face of the apple. The roughened or scabby area may cover 

 all one side of the apple and even cause it to crack. It is from 

 this scabby appearance that the disease takes its common 

 name. The disease on the leaves causes sooty spots on the 

 under side. Later these leaves become yellow and drop from 

 the tree, in severe cases taking most of the leaves from 

 the tree. 



Fig. 143. — Time for first sum- 

 mer spray on peach and plum, as 

 the calyx is being shed from young 

 fruit. (Experiment Station, N. J.) 



