UNITED STATES DEPARTMENT OF AGRICULTURE 



BULLETIN No. 278 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief. 



JfUW^-ft- 



Washington, D. C. 



PROFESSIONAL PAPER. 



October 5, 1915 



MISCELLANEOUS INSECTICIDE INVESTIGATIONS. 1 



By E. W. Scott and E. H. Siegler, Entomological Assistants, Deciduous-Fruit Insect 



Investigations. 



CONTENTS 



Introduction 



Experiments, 1912. 

 Experiments, 1913. 



Field experiments. . 

 Summarized review. 

 Conclusions 



Experiments, 1914 19 I Key to tables. 



INTRODUCTION. 



Numerous experiments with miscellaneous insecticides and spray 

 combinations, including tests of a new and promising arsenical, 

 namely, arsenate of calcium, were conducted in connection with other 

 work at the field station for deciduous-fruit insect investigations, at 

 Benton Harbor, Mich., during the seasons of 1912, 1913, and 1914. 

 Various homemade and proprietary insecticides, alone and in com- 

 bination with other sprays, were tested in the laboratory and in the 

 field. This work was done under the instructions of Dr. A. L. 

 Quaintance, in charge of Deciduous-Fruit Insect Investigations, and 

 much valuable assistance in carrying out the work was rendered by 

 Messrs. J. H. Paine, H. G. Ingerson, and D. M. Hamilton. 



EXPERIMENTS, 1912. 



A series of poison-feeding experiments were made to determine the 

 comparative killing effect of various arsenicals and also doubtful 

 stomach poisons on different species of chewing insects. At the be- 

 ginning of the tests 32 different materials were used, but since the 



1 See key to the table of insecticides on page 43. 



Note. — This bulletin describes experiments with various chemicals, singly and combined, for the 

 destruction of insect pests. It will be of interest to horticulturists in general and apple growers in particular. 

 98119°— Bull. 278—15 1 



