302 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 15 



2. Preventing their escape usually resulted in their being killed by 

 eithre contact with the spray or its colliodal vapor fumes which were 

 formed from the combination of nicotine sulphate and whale oil soap. 



3. It is adaptable in making a thorough application of spray on the 

 smallest plants because two nozzles are adjacent to the ground; an 

 important factor in the fall bean control work, as the leaf -hoppers colon- 

 ize soon after the first leaves are formed. 



4. By holding or confining spray close to the plants within the enclo- 

 sure, the greatest efficiency and economy is produced by the spray, its 

 vapor and fimies. 



5. This spraying device can be operated successfully as fast as 

 a horse usually walks. An acre was sprayed in one hour, and with 

 power or traction sprayer it can be operated by one man. 



The writer plans to add some improvements to this apparatus and 

 also make it adjustable for dusting work as well as liquid and volatile 

 sprays. 



The following table summarizes results of some experiments where 

 new design sp."'yer was used. 



Sprayed Test^.With Check on Control of Bean Leaf-Hopper and Tipburn 



Owing to the dry season six sprayings were applied at intervals of 

 about a week apart. The spray material was applied at a pressure of 

 200 pounds. After simiming up the results on spraying tests the Nico- 

 tine Sulphate and whale oil soap gave the best results with the Bordeaux 

 mixture, Nicotine Sulphate giving the next best results. 



EXPERIMENTS WITH CONTACT INSECTICIDES FOR THE 



CONTROL OF THE JAPANESE BEETLE {POPILLIA 



JAPONIC Ay 



By B. R. Leach and F. J. Brinley Riverlon, N. J. 

 During the summer of 1920, while engaged in testing various in- 

 secticides, the writers noted the fact that a soap solution killed the 



' Published by permission of the Secretary of Agriculture of the U. S. Department 

 o f i^griculture. 



