CONTENTS. 
PAGE 
Injury to Corn by the Timothy Bill-bugs {Sphenophorus sp.) I 
Examination of Injured Field i 
Distribution of Inj ury 2 
The Inj urious Species 2 
The Injury to Timothy 2 
The Injury to Corn 3 
General Results of the Injury 3 
As affecting the whole Plant 3 
As affecting the Ears 4 
Total Amount of Injury 4 
Statistics of Bill-bug Injury to Corn, Dalbey Field, 1902 6 
Methods of Prevention 6 
Summary 7 
Field Experiments on the Corn Root-aphis {Aphis maidiraciicis Forbes) 8 
The Season of 1904 8 
The Galesburg Cultivation Experiment. (Table I.) 9 
The Harvel Experiment. (Table II.) 11 
The Season of 1905. Bradford, Illinois 13 
The Hinman Experiment 15 
The Finnegan Experiment 19 
Observations on the Barto Farm 20 
Observations in the Thompson Field 23 
Additional Miscellaneous Observations 24 
General Discussion of the Results 26 
Field Experiments for the Protection of Corli against Chinch-bug Injury.... 30 
Barrier Experiments 30 
Summary of Conclusions 32 
Use of Kerosene Emulsion 32 
The Carbondale Experiment ■. . . . 33 
The Fairman Experiment 36 
Dubois and Odin Experiments 39 
Experiments with Fluid Insecticides 40 
Experiments with the Gasoline Blast-lamp 43 
On the San Jose Scale 46 
On the Harlequin Cabbage-bug 48 
On the Cotton Boll-weevil 49 
At Urbana 50 
Use of the Gasoline Torch against the Chinch-bug 52 
General Summary 56 
Comparative Experiments with Various Insecticides for the San Jose Scale. . 59 
System of Inspection 60 
Conditions necessary to Exact Experiment 61 
Original Purpose of Operations 62 
Most General Results 62 
