July, 1914.] 



THE APPLE MAGGOT. 



109 



half gallon of the stock solution to a square yard, as indicated in 



the table, a heavy dose of oil and a large quantity of water would 



be necessary to secure equivalent treatment for all the ground 



beneath a single tree. An English material, known as Cliffs 



Insecticide, was used in one case, mixed with the surface layer of 



soil to a depth of two and one-half inches. In this case no adults 



emerged. In another case where this same material was spread 



over the surface of sod ground there was a heavy emergence of 



adults. 



Table 27. 



Results of Applying Insecticides to Soil, June 17-19, 1911. 



BURYING PUP.^ BY PLOWING. 



Experiments here and elsewhere have proved that in ordinary 

 soil plowing cannot be expected to bury pupa deep enough to 

 prevent emergence of the adults. 



