PROCEEDINGS, 1916. 



19 



The foregoing observations would seem to be corroborated by the following figures 

 compiled from Bulletin 369 of the Cornell University Agricultural Experiment Station 

 by Reddick and Crosby. 



The accompanying table shows the average number of apples per tree from the 

 •check and the lime sulphur sprayed trees of the various orchards. 



No. 



Owner and Location. 



E. W. Mitchell, 

 Stuyvesant Falls, N.Y 



W. P. Rogers & Co., 

 Williamston, N. Y. 



Jacob Jungbluth, 

 Spencerport. N. Y. 



F. H. Glidden & Sons, 

 Holley, N. Y. 



F. H. Glidden & Son, 

 Holley, N. Y. 



E.J. McClew&Son, 

 Newfane, N. Y. 



E.J. McClew&Son, 

 Newfane, N. Y. 



Variety. 



Baldwin 



Maiden Blush 



Twenty-ounce 

 Pippin 



R. I. Greening 



Baldwin 



R. I Greening 



Baldwin 



Average No. of 

 apples per tree 

 from unsprayed 

 orchard. 



Average No. of 

 apples per tree 

 from orchard 

 sprayed with lime 

 sulphur and 

 arsenate of lead. 



1244.5 



2606.5 



508.75 



1272.3 



1633 25 



577.75 



1732.75 



2352.25 



2132.75 



286.75 



165 



273 



436.5 



362 6 



The lime sulphur was used 2\ gals, to 100 gals, of water in all cases excepting in 

 orchard No. 3 where it was used 3 to 100. 



It will be seen by examination of the foregoing figures that with one exception the 

 yield from the check trees was greater than from those sprayed with lime sulphur and 

 arsenate of lead. Regarding orchard No.l the authors state that apple scab was not 

 prevalent in the orchard during the summer, so that evidently the greater crop from 

 these sprayed trees was due to individual variation and not to scab control and an ex- 

 amination of the figures show that it is not accounted for by increased insect control. 

 It is conceivable that the greater crop received from the unsprayed trees might have 

 been due to chance but it is significant that the results should have been so consist- 

 tent throughout. 



Period at Which Spray Causes the Most Injury. 



To determine this point another set of Wagner trees was selected and sprayed at 

 different periods with lime sulphur, 1.009 sp. gr., or 1 gallon of concentrate to 33 gallons 

 of water, adding paste (acid) lead arsenate 2 lbs. to 40 gals. In this experiment other 

 Wagner trees were sprayed with Bordeaux mixture 4-4-40 formula at the same dates as 



