50 



NEW YORK STATE MUSEUM 



these figures, that the variation in the yield on the various plots 

 has affected materially the results obtained, though there is a 

 somewhat uniform though accidental (owing to the yield of the 

 various plots) decrease in production with an increase in the num- 

 ber of poison applications. 



The material benefits resulting from the application of poisons is 

 well shown by our obtaining only about 72;^ of worm-free fruit on 

 the check trees, while the sprayed plots produced from 98 to 99^ of 

 sound fruit. The observations upon the apples were checked by an 

 examination of the trunks of the trees the following May. This 

 showed that paper bands, accidentally left on check trees X and Y, 

 sheltered numerous codling moth cocoons, there being some 60 on 

 X and 50 on Y. Examination of bands on sprayed trees in other 

 plots resulted in finding no codling moth larvae. 



There is, it will be seen by reference to the detailed tabula- 

 tions, and also the summary, more or less variation between the 

 percentage of wormy fruit obtained from trees of the different 

 plots. For example, in plots i to 3 this ranges from .32 

 of i;^ to 3.16^' or a difference of 4 to iii wormy apples. O'n 

 plots 4 to 6 we have a variation between individual trees, of .49 

 of i^ to 2.74^ or a range of from 4 to 80 wormy apples. These 

 variations can hardly be considered excessive if a moderate 

 allowance is made for the difference normally obtaining in an or- 

 chard, and also for the difificulty of spraying every tree exactly 

 alike. 



Fruitfulness and infestation 



PLOT 



MAXIMUM TREE 



MINIMUM TREE 



No. fruit 



% wormy 



No. fruit 



% wormy 





8 745 

 3 649 



2 298 



5 044 



s 13,7 



3 321 



.63 

 • 75 

 .61 

 .96 

 .49 

 .70 



3 S07 

 226 

 417 



3 002 

 994 

 767 



3.16 

 2 .66 





3 



2.64 





2.64 

 i-So 

 3.74 





6 





,A,, study of the results obtained on maximum and minimum 

 trees, show that in plot i, the maximum tree producing 8745 

 apples yielded but .63 of 1^ wormy fruit, while the minimum 

 tree: producing 2507 apples had 3.16^ wormy. Similar results, it 

 wilj be seen by referring to the table showing the variation in 

 individual trees, were found in the other plots. That these vari- 



