CONTENTS, 



PAGE 



Introduction, ........... 153 



History and distribution, ......... 154 



Food plants, ............ 165 



Nature of injury to cucumbers, ......;. 156 



Economic importance of the pest on cucumbers, ..... 156 



Life history, ............ 157 



Feeding habits and dispersion, ........ 159 



Natural enemies, ........... 160 



Introduction to experiments, ......... 160 



Experiments conducted in the laboratory, ...... 161 



Fumigation experiments, ......... 161 



Spraying experiments, ......... 163 



Summary of materials found to be efficient experimentally, . . . 169 



Experiments conducted in commercial greenhouses, ..... 169 



Lemon oil, . . . . . . . . . . 170 



Linseed oil emulsion, ......... 170 



Conclusions drawn from commercial spraying experiments, . . . 172 



Prevention, . . . . ... . . . . . . 172 



Control measures, ........... 172 



Preventive measures, . . . . . . . . .172 



Repressive measures, ......... 174 



Control of red spiders attacking other crops, . . ... . . 179 



Summary, . ........... 180 



Bibliography, 181 



Publication of this Document 



approved by the 

 Supervisor of Administration. 



