24 



NEW YORK STATE MUSEUM 



yield of the two Baldwin trees. Nevertheless, it will be seen that 

 there is a fairly close comparison between the results obtained upon 

 these different varieties in the same plot, subjected as near as might 

 be to similar treatment, except that in the case of scab infection a 

 considerably higher percentage, namely, 25.40, of the Baldwins were 

 infected, whereas the greenings showed but 14.27. This is very 

 probably due to variation in the preblossoming spray. A reverse 

 condition obtains in relation to leaf roller, there being 7.74 per 

 cent affected on the Baldwins and 17.44 on the greenings. The 

 average percentage of wormy fruit for the two varieties is almost 

 identical. There is no marked difference in the end wormy, the 

 difference between none on the greenings and but .16 on the Baldwins 

 being so slight that we can hardly attach special significance thereto. 

 There is a little, though not marked, variation in the percentage of 

 side July, " shallow " and side August. In fact, the parallelism 

 is so close that one might conclude that the two varieties were 

 practically equally susceptible to codling moth injury. 



Barker orchard, checks (unsprayed) 1917 





TOTAL 

 FRUIT 



PER- 

 FECT 



SCAB 



LEAF 

 ROLLER 





CODLING MOTH, 



WORMY 





TREE 



Total 



End 



Side 

 July 



Shal- 

 low 



Side 



August 



Y 



590 

 I 149 



100 

 16.95 



425 

 36.99 



313 

 53-00 



377 

 32.81 



31 

 5.25 



109 

 9.48 



319 

 54 06 



406 

 35-33 



52 

 8.81 



96 

 8.35 



84 

 14-23 



170 

 14.80 



156 

 26.44 



176 

 15-32 



60 



Feicent 



X 



Percent 



10.17 



81 

 7.04 



Total 



Per cent 



I 739 



525 

 30.18 



690 

 3967 



140 

 8.05 



725 

 41.69 



148 

 8.51 



254 

 14.60 



332 

 19. 10 



141 

 8. 11 



The two check or unsprayed trees show a marked contrast to the 

 experimental plots. Attention should first of all be called to the 

 fact that in selecting these trees practical considerations led to the 

 choosing of those with a moderate or small crop and as a consequence 

 the percentage of infested apples would very likely be higher. Never- 

 theless, there is a marked contrast between the 54.06 per cent of 

 wormy fruit on. tree Y with its total yield of 590 apples and 14.64 

 per cent of wormy fruit on tree E of plot 3 with a yield of only 43 7 

 apples. Similarly tree X with its 35.33 per cent of wormy fruit in 

 a total yield of 11 49 apples contrasts strongly with the 13.95 per 

 cent of wormy fruit on. tree D of plot 1 with its crop of 1139 apples. 



