REPORT OF THE SOCIETY 



39 



On June 1 these trees were examined again and counts were made of 

 infested buds from large branches chosen from the sprayed and unsprayed 

 sides of the trees. The following table shows the results: 



Aphis pomi and Aphis sorbi. 



It will be seen from this table that a very marked difference in the 

 amount of control is shown. The winged forms have not yet appeared in 

 large numbers so that they have not spread widely. Later the lice became 

 widespread and occurred in large numbers but were not so abundant as to 

 do any very considerable damage. 



On June 17 another examination was made but the plant lice were so 

 widely scattered that it seemed useless to make counts. At this time 

 the Maiden Blush, Fall Pippin and Tompkins King were rather severely 

 infested, whereas Baldwins, Westfield and Rhode Island Greening had only 

 a scattering infestation. Even at this time there was a marked difference 

 between the windward and leeward sides of the trees, the windward side 

 (sprayed) showing a much lighter infestation. 



Further experiments in the control of the apple plant lice were under- 

 taken with the co-operation of Mr. Grossman at Wolcott, N.Y. In these 

 experiments no checks were left but a neighboring orchard a few rods 

 distant was used. In this work the following sprays were applied just as 

 the lice were clustering on the opening buds (Apl. 21, 1915): 



