TABLE OF CONTENTS 
Introduction 
General Structure and Habits of the Plant Lice. 
External Structure of the Aphids. 
APPLE PLANT LICE . 
The Wooly Apple Aphis... 
Past History. 
The Louse Described. 
Life History. 
Birth Record of Winged Migrants. 
Parts of Tree Most Attacked; Injuries. 
Prevention. Natural Enemies. 
Remedies Above Ground; Kerosene Emulsion. 
Scalecide and Other Miscible Oils; Soaps ; “Black Leaf”.... 
Tobacco Decoctions. 
Lime-Sulfur Sprays. 
Late Winter or Early Spring Applications; Tanglefoot Bands 
Mounding and Cultivating; Trimming. 
Treatment Below Ground. 
Experiments in Grand Valley. 
The Applications and Their Results. 
Experiments for the Desitruction of Woolly Apple Aphis. . . . 
Experiments in the Orchard of J. Cornetto. 
Carbon Bisulfld. Tobacco Dust and Stems; Decoctions. 
Black Leaf Dip. 
Scalecide; Soaps. 
Some Wholly Unsuccessful Substances. 
Root Treatment of Nursery Stock. 
Conclusions as to Best Methods of Treatment. 
The Green Apple Aphis; Pood Plants.'. 
Life History; The Eggs.... . 
The Stem Mothers; Second Generation. 
Wingless Female of Summer Generations; Winged Females 
Males; Egg-Laying Females; Natural Enemies. 
Remedies; Winter and Early Spring Spray. 
The Clover Aphis.. .... 
Pood Plants and Life History.. 
The European Grain Aphis. 
The Rosy Apple Aphis. 
The Sweet Clover Aphis. 
PEACH PLANT LICE. 
The Green Peach Aphis. 
Name and Life History. 
Pood Plants... . . 
Injuries; Natural Enemies. 
The Black Peach Aphis; Appearance; Remedies. 
Life History.. 
Prevention and Remedies.. 
PLUM LICE... 
The Mealy Plum Louse.. 
Hop Plant Louse. 
Rusty Brown Plum Louse. 
BLACK CHERRY LOUSE.. 
PREPARATION OF THE INSECTICIDES MENTIONED. 
Kerosene Emulsions. 
Precautions. 
Tobacco Decoction. Black Leaf.. 
Miscible Oils. 
Lime-Sulfur Mixture. 
Rex Lime-Sulfur. 
Whale-Oil or Fish-Oil Soaps. 
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