ORCHARD SPRAYING EXPERIMENTS. JJ 



It will be noted that the dilution at 32 degrees Beaiime is 

 stronger than that used in the Maine experiments on the Ben 

 Davis. A dilution of 1-40 for a concentrate testing about 2,2 

 degrees is recommended for trial in this state on the more sus- 

 ceptible varieties of apples. 



The concentrate should always be tested for density at the 

 time of using. It is also a good plan to mark the density of 

 each barrel-full at the time it is made. 



Arsenate of lead should not be added until the solutions are 

 diluted and ready for use. 



If the concentrated solutions are to be stored for some time 

 before using, the barrels should be entirely filled to exclude air. 

 If this is not feasible, or when a part has been withdrawn for 

 use and the balance is to be held for a considerable time, it 

 should be protected from the air with a thin coating of paraffin 

 oil or other heavy oil. If made during the winter it should not 

 be allowed to freeze. 



Time and Methods oe Application. 



Successful results from spraying operations depend upon 

 three factors : properly prepax'ed mixtures, timeliness and thor- 

 oughness of application. Too much emphasis cannot be laid 

 upon them. Failure to observe these conditions may be held 

 accountable for the great majority of cases where spraying 

 has not given the results desired. 



For the proper preparation or dilution of spraying mixtures 

 it is only necessary to follow the directions given. Guesswork 

 or slipshod methods should not be tolerated. The formulae 

 which have been and are being derived are the results of ex- 

 periment and experience. Improvements may be made in the 

 future. These the progressive orchardist will learn by obtain- 

 ing the station bulletins on the subject as they appear. 



Timeliness of application demands merely a knowledge of 

 the orchard enemies to be fought. These are described and 

 means of control recommended in former publications of this 

 station.* When the grower finds evidence of insect or fun- 



* Morse, W. J. and Lewis, C. E. "Maine Apple Diseases," Bull. 185 

 of this Station. 



Patch, E. M. and Johannsen, O. A. "Apple Tree Insects of Maine," 

 Circular 383. 



