22 NEW YORK STATE MUSEUM 



A study of the above data reveals several very interesting 

 facts. The 16,638 apples of plot i are fairly evenly distributed 

 between the 6 trees, the numbers ranging from 1794 to 4071. 

 The average percentage of worm-free fruit is 99.26, the indi- 

 vidual trees varying from 99.11 to 99.41. The total wormy fruit 

 is only 123. one tree having but 11, while the maximum is 36. 

 The number of end wormy per tree varies from i to 10, while 

 the side wormy range from 10 to 28, a total of 31 end wormy 

 and 104 side wormy. Assuming that the percentage of infested 

 fruit on the check trees in this series is typical for the plot, we 

 find that one application has reduced the infestation by 14 per 

 cent, or resulted in removing from the wormy column some 

 2329 apples, about 43/2 barrels. The cost of spraying the 6 trees 

 was 48 cents, or less than 12 cents for each barrel of fruit kept 

 from being thrown into second-class or cider apples as an out- 

 come of injury by codling moth. The financial returns from 

 this transaction are apparent. 



The 19,994 apples of plot 2 range in number per individual 

 tree from 1383 to 4307. The percentage of sound fruit is 99.54, 

 a variation for individual trees of from 98.98 to 99.82. The 

 total wormy is only 91, there being only 8 of these end wormy 

 and 86 side wormy. The end wormy per tree vary from nothing 

 to 5, while the side wormy range from 6 to 30. The second 

 treatment resulted in an additional gain of slightly over ^ of 

 I per cent (.28 per cent) over the single treatment for plot i. 

 Obviously, the returns from this second spraying are relatively 

 less than in the case of the first. 



The total fruit in plot 3 amounts to 20,926, individual trees 

 producing from 2473 ^o 4347. The percentage of worm-free 

 fruit was exactly the same as in plot 2, 99.54, the variations 

 ranging from 99.22 to 99.90. There were a few more wormy 

 apples than in plot 2, namely, 96, 19 of these being end wormy 

 and 79 side wormy. There appears to have been no material 

 benefit in the case of this plot, resulting from the third spraying. 

 This is more probably chargeable to the extreme thoroughness 

 of the first two applications rather than being attributable to 

 any defect in method. The margin of less than I/2 per cent 

 (.46 per cent) is so small that at best only a very slight differ- 

 ence could be expected. 



Plot 4 comprises only 4 trees producing 8969 apples, indi- 

 vidual trees yielding from 1009 to 3030. The percentage of 



