3» 



NEW YORK STATE MUSEUM 



only one spraying are compared above. It will be noted that there 

 is a wide discrepancy in either the number or percentage of perfect 

 apples, due largely to local conditions and resulting particularly 

 from scab infection. There is also a considerable, though not such 

 a wide variation in the amount of fruit injured by the leaf roller. 

 The number and percentage of apples infested by the codling moth 

 vary greatly in the different orchards and range from 5.20 to 27.67 

 per cent. This percentage difference is to be accounted for partly 

 by the much larger crop in the Webster orchard, though it will be 

 noted on comparing the results obtained in the Newfane and Kendall 

 orchards, that the yield for each plot was approximately the same, 

 while the percentage of infested apples was twice as great in the 

 latter. Injury by larvae entering at the blossom end was com- 

 paratively small, while by far the greater part of the damage is to 

 be attributed to late-hatching larvae entering the apples in July. 



Summary of the two spray treatment, 19 15 



ORCHARD 



NO. 



PERFECT 



SCAB 



LEAF 

 ROLLER 



OR 

 GREEN 

 FRUIT 

 WORM 



CODLING MOTH, WORMY 



Total 



End 



Side 

 July 



723 

 12.82 



38 

 .67 



574 

 10. 10 



901 

 31.64 



15 

 • 52 



837 

 29.39 



5ii 

 3.27 



13 

 .08 



496 



3.17 



2 135 

 8.86 



66 

 .27 



I 907 

 7.91 



Side 

 August 



Newfane 



Total 



5 638 







Kendall 



Total 



2 847 







Webster 



Total 



15 604 









24 089 



2 352 

 41.71 



I 092 



38.35 



10 529 

 67.47 



13 973 



58. 



2 258 

 40.04 



343 

 12.04 



4 082 

 26.15 



6 683 



27.74 



732 

 12.98 



1 194 

 41-93 



1 087 

 6.97 



3 013 



12.50 



266 



4-71 



55 

 1-93 



■ 05 



329 

 1.36 



The three plots compared in the table present considerable 

 differences as in the case of those receiving but one application, the 

 percentage of perfect fruit being decidedly greater in the Webster 

 orchard. This latter is easily accounted for to some extent at least, 

 by the large crop and, within certain limits, relative freedom from 

 scab infection. There are wide variations in the percentages of 

 apples injured by the leaf roller, these varying from 6.97 per 

 cent in the case of the Webster orchard to 41.93 per cent for the 

 Kendall orchard. There is nearly as wide a range in the percentage 

 of apples infested by the codling moth, by far the greater part of the 

 damage being due to larvae hatching from late-deposited eggs. 



