342 



The Spraying of Plants. 



exercised in the application of the oil that it is not too freely 

 distributed. By mixing some coloring matter with the kero- 

 sene the treated parts may easily be distinguished. 



Plum Pockets; Plum Bladders (Exocutcu* [Taphrina] Pruni, 

 Fuckl.). Description. Plums are frequently attacked by this 



FIG. 78. Plum pockets. 



fungus soon after they blossom. The affected fruit begins to 

 swell (Fig. 78) until it is from one to two inches in length. At 

 first the plums are very smooth, but they are yellow in color. 

 Later this changes to gray, the appearance being caused by a 

 thick coating of the spores of the parasite. This color is then 

 replaced by dark brown or black, and towards the end of June 



