SPRAYS AND OTHER MEANS OF CONTROL 



1877 



may be needed at times. Now and then 

 minor troubles on special crops appear 

 and require treatment not given in the 

 calendar. 



Again, a disease, although important in 

 itself, but having a very limited distribu- 

 tion and of little general interest, could 

 not be given space in a calendar. As an 

 instance, the rust of apples and pears is 

 omitted for the reason that it is not, as 

 yet, generally serious. 



To read the spray calendar, read right 

 across two pages. When it is determined 

 what you wish to spray for, follow the 

 line to the next column, which tells what 

 to use; then read the notes following the 

 same line. Very often the notes give just 

 the information needed, and also refer 

 to the formulae and directions for use. 



How to Spray 



Use plenty of pressure, 200 pounds or 

 more is better than lower pressure. Ap- 

 ply thoroughly, drenching every part of 

 the tree. Do not try to save by economiz- 

 ing on spray. If your trees are tall, use 

 a tower and spray down from it. Exam- 

 ine trees after they are sprayed, espe- 

 cially for codling moth spraying, and 

 see that poison has entered the calyx 

 cups. Nothing short of good work should 

 be tolerated. Do not think that a spray 

 applied out of season will be effective. A 

 spray is only effective when applied at the 

 right time. Sprays are not "cure-alls.'* 

 Use the spray suited to the case in hand. 



Fig. 6. Twigs Sprayed with Lime-Sulphur. 

 Spraying should be done thoroughly. The 

 unsprayed surface of the twigs to the right 

 might harbor many scales. 



(Purdue Experiment Station) 



