UNITED STATES DEPARTMENT OF AGRICULTURE 
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I BULLETIN No. 278 
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Contribution from the Rureau of Entomology 
L. O. HOWARD, Chief. 
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Washington, D. C. 
PROFESSIONAL PAPER. 
October 5, 1915 
MISCELLANEOUS INSECTICIDE INVESTIGATIONS. 1 
By E. W. Scott and E. II. Siegler, Entomological Assistants, Deciduous- Fruit Insect 
Investigations. 
CONTENTS. 
Page. 
Introduction 1 
Experiments, 1912 1 
Experiments, 1913 11 
Experiments, 1914 19 
Page. 
Field experiments 27 
Summarized review 38 
Conclusions 42 
Key to tables 43 
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 
