BULLETIN 271 

 APPLE SPRAYING EXPERIMENTS IN 1916 AND 1917* 



W. J. MORSE. 



This publication constitutes the seventh and eighth annual 

 reports of progress with the apple spraying experiments which 

 are being conducted at Highmoor Farm, Monmouth. In 1916 

 9 and in 1917 10 different plots were used. Each of these 

 plots consisted of 24 trees, or 4 rows of 6 trees to the row, 

 except plot 1 in 1917 had only 23 trees. All were of the Ben 

 Davis variety. 



The above mentioned plots were located in the orchard 

 known as "Ben Davis No. 2", which consists of a solid block of 

 555 trees. Somewhat less than two-fifths or 216 trees in 1916 

 and nearly three-sevenths or 239 trees in 191 7 were included 

 in the experiments. 



The very evident value of arsenate of lead as a preventive 

 of apple scab when used alone, as shown in the results obtained 

 in the 4 previous, consecutive seasons seemed to warrant the 

 testing of this material on a larger scale in 1916. Accordingly 

 one-half of the orchard known as "Ben Davis No. 1" was 

 sprayed with lime-sulphur 20 per cent stronger than standard, 

 plus one pound of dry arsenate of lead to 50 gallons for the 

 blossom bud application. f The two remaining applications con- 

 sisted of double strength arsenate of lead alone. This duplicates 



*A general discussion of the nature and extent of the previously 

 conducted experiments with a summary of the results obtained is given 

 in Bulletin 249 entitled, "Six Years of Experimental Apple Spraying at 

 Highmoor Farm." The results for 1915 are given in Bulletin 252 of 

 this Station. 



fBy standard dilution lime-sulphur is meant the equivalent of 1 

 gallon of 33° B. lime-sulphur concentrate to 40 gallons of water. To 

 make the so-called 20 per cent stronger dilution one-fifth .more of the 

 concentrate is added to a given amount of water than is used to make 

 the standard dilution. 



