REPORT OF THE STATE ENTOMOLOGIST Kjll 37 



series I there is no difference between the percentage of sound 

 fruit produced by plots 2 and 3, each giving an average of 99-54- 

 In series 2, however, there is a nearly uniform gain of y 2 of 1 

 per cent from each spraying after the first. There is a marked 

 contrast between the amount of sound fruit produced on the plots 

 receiving one treatment just after the blossoms dropped and on 

 similar plots sprayed once three weeks later, the benefit result- 

 ing from this treatment ranging from one-third to two-thirds 

 that of the early spray. An examination of the data relating to 

 end wormy apples shows a very interesting condition. In series 



1, plot 1 there were 31; plot 2, 8; plot 3, 19; plot 4, 281 and in 

 the check trees, 545. It will be observed that the decrease in 

 wormy apples resulting from the various sprayings is very 

 largely in the end wormy, while the poor results following the 

 one late spray must be attributed in considerable measure to 

 failure in destroying the young caterpillars entering the blossom 

 end of the apple. The data relating to the check trees give an 

 idea of the number normally attacking the apple at this point. 

 The same thing is even better illustrated in the figures for series 



2. Plot 1 has 42 end wormy; plot 2, 107; plot 3, 83 ; plot 4, 2000, 

 while the check trees produced 2997 end wormy apples. 



A careful comparison of these figures supports the well- 

 established belief that the first spraying within a week or ten 

 days after the blossoms fall is by all odds the most important so 

 far as preventing wormy apples or controlling the codling moth 

 is concerned. Under the conditions obtaining in series 1 and 2, 

 the benefits resulting from the second and third application are 

 comparatively slight and of themselves would hardly justify 

 additional treatment. Should it be advisable to spray for fun- 

 gous diseases of one kind or another,- we would not hesitate to 

 recommend the addition of poison, since even the small benefit 

 recorded above would more than repay the cost of the poison, not 

 to mention the protective or insurance value of these later treat- 

 ments in case there was an exceptionally large second brood as 

 in 1910. 



Summary of three years' work. Conclusions based upon the 

 results of one season are of comparatively slight value. We have 

 therefore brought together in one table the data relating to the 

 experiments of three seasons, 1909-11. 



