273 



miles from the Experiment Station. Tlie only variety available for the- 

 purpose was the Early Harvest, nearly all the frait of other varieties 

 having been destroyed by frost and cold, wet weather. The fruit upon 

 a number of the sprayed trees was destroyed, and the plan of the ex- 

 periment was in consequence somewhat disarranged. 



The Xixon Little Giant spraying machine and the So. 3 Nixon nozzle 

 were used in spraying the trees. Instead of attaching a pole to the 

 hose, a section of three-eighths inch iron gas-pipe 10 feet long was con- 

 nected with it and the nozzle screwed upon the end of the iron pipe. 

 I find that it is much more convenient than a pole, and at the same time 

 every part of the tree can be reached with the spray. 



Six rows of trees were selected, and each row was given a different 

 treatment. Three rows were treated with London i^urple and three 

 with Paris green. The first row in each case was sprayed with water 

 containing the insecticide in the proportion of 1 pound to 200 fj^allons of 

 water, the second 1 pound to 300 gallons, and the third 1 pound to 400 

 gallons. A portion of the trees in each row was treated at two differ- 

 ent dates, May 16 and 31. Another i^ortion was treated at the same 

 time, and again on June 14. Still another i^ortion was treated May 

 31 and June 14. 



The fruit was picked from the trees July 8, 9, and 10. Each apple 

 was carefully examined and the percentage of the yield containing Cod- 

 ling larvse and recorded as wormj' was as follows : 



Two trees sprayed May 16 and 31, at the rate of 1 pound of London 

 purple to 200 gallons of water, produced 2,618 apples, of which 272 or 

 9.7 percent, were wormy. 



The two trees spraj'ed with Paris green at the same rate produced 

 3,120 apples, of which 149 or 4.5 per cent, were wormy ; or 5.2 per cent, 

 less wormy fruit from the trees sprayed with Paris green. 



Two trees sprayed May 16 and3L at the rate of 1 pound London pur- 

 ple to 300 gallons of water produced 170 apples, of which 21 or 15.1 per 

 cent, were wormy, and two trees sprayed with Paris green at the same 

 rate produced 740 apples, of which 2S or 7 per cent, were wormy ; a 

 difference of 8.1 i^er cent, in favor of Paris green. 



Two trees sprayed May 16 and 31 at the rate of 1 pound of London, 

 purple to 400 gallons of water i)roduced 189 apples, of which 23 or 12.1 

 per cent, were wormy. 



One tree sprayed with Paris green at the same rate produced 732 

 apples, of which 45 or 6.1 i)er cent, were wormy ; a difference of 6 per 

 cent, in favor of Paris green. 



Combining the above treatments of each insecticide, we find that 12.3 

 per cent, of the total yield of the six trees treated with London purple 

 were infested with the Codling larva, and only 5.8 per cent, of the total 

 yield of the five trees treated with Paris green were infested, giving 

 6.5 per cent, less wormy fruit from trees receiving the Pans green 

 treatment. 



