DISEASES OF CULTIVATED PLANTS 



463 



velop. The slightly affected fruit may almost entirely outgrow its 

 injuries by picking time, but when the injury is very great the fruit 

 may drop before maturity, and in any case is of little commercial 

 value. 



Spraying for Apple Diseases. 



-(N. H. fi. S. B. 144) 



The most serious injuries have been obtained from the early 

 sprayings. This may be largely due to the fact that showers are 

 common at that time of year. It is a well-known fact that when an 

 application of Bordeaux is followed by rain within the next few days 

 it is likely to produce injury. Records from a large number of cases 

 of Bordeaux injury in New Hampshire would indicate that damage 

 seldom, if ever, occurs in properly sprayed orchards except under the 

 above mentioned conditions. 



The injury done by Bordeaux has not been great enough to 

 offset the good accomplished, and various commercial growers have 

 annually obtained large profits from its use, yet the condition has 

 been serious enough to make strong demands for a solution of the 

 difficulties. The matter has been taken up at various experiment 

 stations, including those of New York, Illinois and New Hampshire, 

 but a complete solution of the problem has not been found. 



Much trouble may arise from the use of improper mixtures and 

 from unsatisfactory methods of application. Only good material 

 should be used, and the following of the directions for making the 

 solution is important. The liquid should be applied to the tree as 

 a fine mist and never allowed to sprinkle or drip from the nozzles. 

 The foliage must be thoroughly covered, but dripping from the 

 leaves indicates an excessive or careless application. Mistakes are 

 often made by trying to spray with insufficient power. A pressure 



