CONTENTS. 



Economic importance of the pest. 

 Description of potato plant lice, 

 Manner of feeding and nature of injury, 

 Life cycle of the potato plant louse, . 

 Control measures, .... 



Practical considerations and fundamentals of control, 

 Efficiency of various contact insecticides for the control'of potato 

 Discussion of results, 

 "Black Leaf 40," 

 "Black Leaf 40" and Pyrox, etc, 

 "Nico-Fume" liquid. 

 Fish-oil or whale-oil soaps 

 Kerosene emulsion, 

 Miscible or soluble oils, 

 Lime-sulfur, 

 Spraying apparatus, 

 Summary of control measures. 

 Natural agents in the control of potato plant lice, 

 Acknowledgments, ...... 



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Publication of this Document 



appboved bt the 

 Supervisor of Administration. 



