181 



Page. 



Seasonal history 103-123 



Attraction to squares, gradual. See Gradual attraction of hibernated 

 weevils to squares. 



Concentrating weevils in spring on trap plants 54 



Destruction of stalks, some reasons for early 121-123 



Development during hibernation. /See under Hibernation; Gradual devel- 

 opment during, in southern Texas. 



Dissemination or artificial spreading of weevils 123-127 



Seed houses, influence upon dissemination 124 



Distance hibernated weevils fly to food 108-109 



Early destruction of stalks. See Destruction of stalks. 

 Fall destruction of stalks. See Destruction of stalks. 



Gradual attraction of hibernated weevils to squares 109-110 



Hibernation, duration of 105 



Hibernation of weevils 103-112 



Emergence from, gradual 107-108 



Emergence from, time of 106-107 



Entrance into, conditions affecting 103-104 



Favorable conditions for 105 



Flying to food, distance. See Distance hibernated weevils fly to food. 



Gradual development during, in southern Texas 102-103 



Length of hibernation period. See Hibernation, duration of. 



Percentage of weevils hibernating successfully 106 



Shelter sought in 104 



Maximum infestation, effect upon weevil multiplication. See Multiplica- 

 tion of weevils as affected by maximum infestation. 



Movement of hibernated weevils among seppa plants 110-112 



Multiplication of weevils as affected by maximum infestation 119 



Progress of infestation through season 113-116 



Seppa cotton, danger in allowing it to grow 57-58 



Seppa cotton, definition of term 53 



Shelter sought in hibernation. See Hibernation, shelter sought in. 

 Square production. See Weevil injury versus square production. 



Squares attacked but not destroyed, proportion of 120 



Stubble cotton. See Seppa, definition. 

 Stumpage cotton. See Seppa, definition. 



Top crop, relation of weevils to 120-121 



Weevil injury versus square production 116-118 



Seppa, stubble or stumpage cotton. See under Seasonal history; Seppa. 

 Spread of weevils. See Dissemination. 



Submergence, endurance of by weevils 139-140 



Sunshine, effect upon larvae in squares. See Control, natural; Temperature 



endured by larvae in squares exposed to sun. 

 Temperature effects. ^See under Life history; Development; Thermal influence. 

 Trap rows. See under Seasonal history; Concentrating weevils. 

 Volunteer cotton. See under Seasonal history; Seppa, definition. 

 Winds carrying weevils. See under Dissemination; Natural agencies. 



o 



