90 JOURNAL OF ECONOMIC ENTOMOLOGY [\'ol. 9 



President Glenn W. Herrick : I should like to ask what species 

 of aphis were used. 



Mr. C. L. Metcalf: The two species used were Aphis spireacola 

 common on Spirea in Maine and Longistigma carycc which is very com- 

 mon here in the lower branches of the sycamore. 



President Glenn W. Herrick: I want to ask you how they would 

 compare in resistance with the green apple aphis. 



Mr, C. L. Metcalf: The Aphis spireacola would ])e just about the 

 same, Longistigma carym more resistant than the apple aphis. 



President Glenn W. Herrick: The last paper on the /program 

 will be given by ]Mr. W. C. O'Kane. 



ARSENIC ON FRUIT AND FORAGE FOLLOWING SPRAYING 



By W. C. O'Kane, Durham, N. H. 

 (Withdrawn for publication elsewhere) 



President Glenn W. Herrick: In answering inquiries in regard 

 to orchard spraying I usually state that it is best to keep cattle out 

 of the orchard after spraying until heavy rain has fallen. 



Secretary A. F. Burgess: I am particularly interested in these 

 experiments because the question of injuring animals as a result of 

 spraying often comes to our attention. In spraying work through- 

 out the country districts that are infested with the gipsy moth, we 

 adopt the policy of spraying where the owner agrees not to pasture his 

 stock after the spray has been applied. In many cases this is perhaps 

 an unnecessary precaution but it is done simply to prevent controversy 

 or misunderstanding. These experiments, I believe, are the first 

 definite and extensive ones that have been carried through on this 

 particular subject and the information will be of great value to en- 

 tomologists. 



IMr. James Troop : I want to add a bit of experience from Indiana. 

 A number of years ago I carried on some experiments along this line 

 in the orchard at Purdue University. The orchard was in blue grass, 

 and the trees about, twenty years old, so that the tops nearly covered 

 the ground. During the spraying season, the superintendent of the 

 farm insisted on letting the sheep run in the orchard. I sprayed this 

 orchard thoroughly for three years with arsenate of lead, using as 

 high as 3 pounds to 50 gallons of water. These trees were sprayed at 

 three different times, each season, and the work was so thoroughly 

 done that the grass under the trees was quite wet. The sheep fed all 

 over this ground, but no harm to the sheep was ever noticed. 



