174 



Birds, relation to boll-weevil control — Continued. Page. 



Slurnella magna (meadowlark), common, but catches few weevils 152 



Sayornis phcebe (phoebe or phcebe bird), occasionally gets a boll weevil... 152 

 Scissor-tailed flycatcher. See Musdvora forficata. 



Spiza americana (dickcissel), very rare, but catches few weevils 152 



Turtle dove. See Zenaidura macroura. 



Western lark sparrow. See Chondestes grammacus sirigatus. 



Zenaidura macroura (mourning dove, turtle dove), very common, but not 



insectivorous 151, 153 



Bollworm. See Heliothis obsoleta. 



Burying squares and weevils. See under Control, artificial; Burying. 



Climate, influence upon weevils. See under Control, natural; Climate. 



Control, artificial 154-163 



Burying squares and weevils 154-155 



Burying squares, effect upon pupation and escape of adults 154-155 



Burying weevils in autumn 155 



Burying weevils in wet soil 154-155 



Cultural method, outlined, with recommendations 161-163 



Futile methods frequently suggested 159-160 



Cotton-seed meal not attractive to weevils 159 



Light trapping for weevils not effective 160 



Mineral paint useless as remedy for weevils 159 



Paris green slightly effective 159-160 



Spraying not effective 1 56, 159 



Sulphur entirely useless 159 



Insecticides 156 



Carbon bisulphid for disinfecting seed 126, 156 



Paris green not sufficiently effective to be recommended 156, 159 



Legislation needed 163 



Machines for field use inefficient 157 



Machines for ginneries 158-159 



Cleaner feeder quite efficient 158 



Fan destroys all weevils passing into it 158 



Gin saws kill but few of the weevils 158 



Improvements suggested . . 158 



Oil mills depend upon control at ginneries 158-159 



Beasons for advantage of cultural methods 160-161 



Control, natural 132-153 



Activity (feeding and oviposition), thermal influence upon. See Thermal 

 influence upon activity and development. 



Climate, probable influence in regions not now infested 140-143 



Climatic conditions, influence upon weevil. See Climatic control. 



Climatic control 134-143 



Development, thermal influence upon. See Thermal influence upon 

 activity and development. 



Diseases caused by bacteria and fungi 143-144 



Floating of weevils 139-140 



Floods, effect upon weevils in fields 138-139 



Gelatin effect 133 



Gelatin formation. See Proliferation, effect in bolls and squares. 



Gelatin formation in bolls 133-134 



Gelatin formation in squares 134 



Gelatinization 133-134 



