UNITED STATES DEPARTMENT OF AGRICULTURE 
DEPARTMENT BULLETIN No. 1201 
Washington, D. C. 
March 19, 1924 
PLANTS TESTED FOR OR REPORTED TO POSSESS 
INSECTICIDAL PROPERTIES 
N. L McINDOO, Insect Physiologist, Fruit Insect Investigations, Bureau of Entomology, 
and A. F. SIEYERS, Chemical Biologist, Office of Drug, Poisonous, and Oil 
Plant Investigations, Bureau of Plant Industry 
CONTENTS 
Pagt 
Economic Aspects of Plan! Insecticides 1 
Methods Used by the Writers in Preparing Plants for Insecticides 2 
Insects Employed and Methods of Testing Preparations against Therpv 3 
Results Obtained by the Writers S 
Catalogue of Plants Tested for or Reported to Possess Insecticidal Properties 24 
General Summary 53 
Conclusions 54 
Literature Cited 54 
Index of Botanical and Common Names of Plants Catalogued 59 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1924 
