103 



DR. FELT. You mean under orchard conditions, or 

 woodland ? 



MR. STAPLES. Orchard conditions. 



DR. FELT. With the trees sprayed ? 



MR. STAPLES. Certainly. We sprayed five times 

 last season, and yet they persisted somewhat, in fact, quite 

 largely, with their work. We picked the nests in the winter 

 and thought we had pretty well got rid of them, and yet we 

 had an abundance of browntails in the spring, and then we 

 sprayed again in August, and a good many persisted through 

 that and lived and ate the leaves. They would not die with 

 arsenate of lead. 



DR. FELT. I think Mr. Frost would be better quali- 

 fied to answer that, because he knows about it. We are not 

 spraying for the browntail in New York, because we haven't 

 got it yet. Mr. Frost is in the business, and he might tell 

 you. 



MR. BRONSON. I would like to ask about sweet spray 

 for the control of the cherry fruit fly and the apple maggot, 

 and whether the use of such sprays would interfere with the 

 beos. 



DR. FELT. I can't tell you about the bees, but Pro- 

 fessor Herrick of Cornell conducted some experiments in 

 1913 near Lake Cayuga, in which he obtained very satisfac- 

 tory results by spraying a small amount of sweetened 

 arsenical poison on the foliage of the cherry for the control 

 of the cherry fruit flies. In regard to the fruit fly on apples 

 — railroad worm — there seems to be some advantage, but 

 there seems to be comparatively little injury from that insect 

 in orchards which are systematically sprayed for codling 

 moth. I have yet to learn of any definite experiments show- 

 ing that this insect is equally well controlled by the use of 

 these sweetened sprays, though I would rather expect that 

 such might be the case. We have been trying for seven or 

 eight years to find a condition where we could thoroughly 

 test out the sweet spray, and as j'et have not been able to do 

 it. We find a few in some orchards, but these were mostly 

 sprayed, and the flies never became abundant enough so that 

 we could get any decisive rata. 



MR. MANN. I want to ask the Doctor what he can tell 

 us of the use of soluble sulfur in killing the San Jose scale. 



