BULLETIN 240. 



APPLE SPRAYING EXPERIMENTS IN 1914. 



W. J. Morse and M. Shapovalov. 



While in many respects the problem of controlling apple scab 

 by spraying has long since become merely a matter of demon- 

 stration, there are still certain phases of it, both from a scien- 

 tific and a practical standpoint which require much additional 

 study. In order to secure data applicable to Maine conditions 

 this Station is conducting a series of apple spraying experi- 

 ments at Highmoor Farm, Monmouth. That this is important 

 and that it is not always safe to generalize too freely in adopting 

 locally the conclusions derived from results obtained in widely 

 separated parts of the country, under different climatic condi- 

 tions, is shown later in this publication. 



In carrying out work of this kind it is necessary to introduce 

 certain experiments, in order to provide a base line upon which 

 to draw conclusions, which if considered by themselves would 

 be simply of the nature of a demonstration. It has also seemed 

 important to those who have had the planning of these experi- 

 ments in charge that they be outlined so as to cover an indefinite 

 series of years, that is, continued for a sufficiently long period 

 to secure accuracy of results, or in other words to eliminate as 

 far as possible inaccuracies resulting from abnormalities in 

 climatic conditions of individual seasons. The experiments in 

 question have been carried out each year in the same part of 

 the smaller of the two large Ben Davis orchards on the farm, 

 although the number of trees involved has varied considerably 

 from season to season. 



The 1914 Experiments. 



The number of trees involved in the 1914 experiments was 

 282, somewhat more than the previous year, all of the Ben 

 Davis variety. In laying out the plots the trees were selected 



