REPORT OF THE STATE ENTOMOLOGIST I917 



25 



The average percentage of wormy apples for the check trees was 

 41.69 with an average of end wormy of 8.51, of side July of 14.60, 

 shallow 19.10 and side August 8. 11 per cent. 



Briefly stated, these unsprayed trees show a big increase in the 

 end wormy, the side July and the side August, this being espec'ally 

 true of the former two, whereas the average percentage of shallow 

 affected ■ apples is less than half of the total percentage of wormy 

 fruit. Broadly speaking, were we to take from the total wormy on 

 the check trees the excess percentage of the side July and side 

 August as compared with the sprayed trees we would have approxi- 

 mately the same relative amount of shallow affected fruit on the 

 unsprayed trees as upon those which were sprayed. In other words, 

 these figures support the contention that the spraying of one season 

 has little effect upon the proportion of side or shallow injury of the 

 same year, and that the reduction in the amount of this type of 

 mischief must be brought about largely by the applications of 

 earlier years reducing the total infestation of the orchard. This is 

 one of the strong arguments for systematic annual spraying without 

 regard to the yield. 



Barker orchard, summary of plots, 1917 



TOTAL 

 FRUIT 



PER- 

 FECT 



3 843 



51.98 



5 430 



62.50 



s 936 



53.89 



525 

 30.18 



I 343 

 18.16 



I Sio 

 17.38 



3 713 

 33.71 



690 

 39.67 



LEAF 

 ROLLER 



I 230 

 16.63 



716 

 8.24 



I 098 

 9.96 



140 

 8.05 



CODLING MOTH, WORMY 



Total 



I 400 

 18.93 



I 40s 

 16.17 



I 150 



10.44 



725 

 41.69 



End 



148 

 8.51 



Side 

 July 



30s 



4.12 



194 

 2.23 



149 

 1.35 



254 

 14.60 



Shal- 

 low 



859 

 11.62 



I 153 

 13.27 



I 027 

 9 32 



332 

 19. 10 



Side 

 .\ugust 



264 

 3.57 



141 

 8. II 



In a study of the summary of these plots allowance should be made 

 for the fact that there is a progressive increase in yield in plots i, 

 2 and 3, though not necessarily because of the increased number of 

 applications. This has a bearing, as pointed out earlier, upon the 

 percentages of infested or infected fruit. There is not a consistent 

 gain in the perfect and an inconsistent increase in the scabby fruit, 

 as compared with plots 2 and 3, due probably to some factor not 



