8 



Natural control — Continued. 



Climatic control — Continued. Page. 

 Laboratory observations upon time weevils will float and endure sub- 

 mergence 139 



Probabilities as to influence of climate upon the weevil in cotton 



regions not now infested 140 



Diseases 143 



Parasites 144 



Breeding of parasites 144 



Fediculoides ventricosus 146 



Predatory enemies 148 



Insects — native ants, Guatemalan ant, mantids 148 



Birds 150 



Artificial control 154 



Effect of burying squares and weevils 154 



Effect upon pupation and escape of adults in dry soil 154 



Effect of burying in wet soil 154 



Burying weevils in autumn 155 



Conclusion 155 



Insecticides 156 



Machines 157 



Machines for field use 157 



Ginning machinery 158 



Futile methods frequently suggested 159 



Mineral paint and cotton-seed meal 159 



Spraying 159 



Sulphur - 159 



Paris green 159 



Trapping at light 160 



Reasons for advantage of cultural method 160 



Cultural method 161 



Legislation needed - 163 



Bibliography 164 



Index 173 



