b 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 j- 91 



Bibliography 93 



Index 98 



