6 THE GRAPE ROOT-WORM. 
Page. 
Natural enemies 50 
Predaceous insects 50 
Parasitic insects 51 
Life history of Fidiobia flavipes Ashm 52 
A dipterous parasite 55 
Double parasitism 56 
Vineyard conditions in the Lake Erie Valley 57 
Remedial measures for the control of the grape root- worm 59 
Evolution of preventive measures 59 
Cultural methods for the destruction of pupae 61 
Effect of poison sprays on the beetle in the field 63 
Cage experiments with poison sprays against the beetles 64 
Field experiments with poison sprays against the beetles 66 
Comparative effectiveness of arsenate of lead and arsenite of lime 68 
Results of vineyard experiments with poison sprays 70 
Results of vineyard renovation experiments 75 
Renovation experiment on an old vineyard 75 
Methods of obtaining and recording results 78 
Renovation experiment on a young vineyard 80 
Sprays 83 
Arsenical poisons 83 
Combining insecticides with fungicides 84 
Preparation of Bordeaux mixture 84 
Plants for preparation of the spray mixture 85 
Time of application of sprays 86 
Number of spray applications 86 
Pressure to be maintained in spray applications 88 
Spraying apparatus 88 
Horse-power sprayers 88 
Gasoline-engine sprayers 88 
Compressed-air outfits 88 
Carbonic-acid-gas sprayers 89 
Hand pumps 89 
The care of spraying apparatus 89 
Nozzle adjustment 89 
Nozzles 89 
Recommendations 89 
Destruction of the adults or beetles 89 
Destruction of the pupae 90 
General treatment of infested vineyards 91 
Bibliography 93 
Index 98 
