822 



THE FRUIT INDUSTRY rx NEW YORK STATE 



scale insects ; secondly, because by destroying the egg masses it is 

 the most economical and efficient method for the control of tent 

 caterpillar; thirdly, because there is always more or less fungi 

 and insects other than those mentioned that it will control ; and 

 fourthly, whenever San Jose scale is present we can hardly expect 

 to retain our trees alive without it. 



FIG. 219. LOW-HEADED, WELL-SHAPED APPLE TREE 



The Foliage Sprays 



Trees take their food in the same forms as we do, which means 

 that before they can make use of food in their growth and develop- 

 ment it must all be elaborated through the leaves which the trees 

 bear. It is therefore essential that the leaves be in the best pos- 

 sible condition in order to perform their function, which they can 

 do only when free from fungi and from insect injuries, both of 

 which can best be controlled by proper spraying. All spraying is 

 dependent on a proper mixture applied thoroughly at the right 

 time, for success. 



If we were to make a separate application for each of the great 

 number of orchard pests, including fungi and insects, we should 

 be spraying all the time. Happily for us this is not necessary. 



