Page. 

 Development — Continued. 



Thermal influence upon activity and development 77 



Laboratory experiment in effect of temperature upon locomotive 



activity 80 



Hibernation - 80 



Length of hibernation period 83 



Apparently favorable conditions for hibernation 83 



Percentage of weevils hibernating successfully 83 



Seasonal history 84 



Emergence from hibernation 84 



Apparent dependence of reproduction upon food obtained from squares. 85 



Progress of infestation in fields 86 



Weevil injury v. square production 88 



Relation of weevils to " top crop " 91 



Some reasons for early destruction of stalks 92 



Dissemination _ . . _ . 94 



Weevils in seed houses at ginneries 94 



Natural control 95 



Mechanical control 1 . 95 



Pilose obstacles to weevil progress 95 



Destruction of larvae and pupa? in bolls and squares by abnormal 



plant growth _ _ _ 96 



Climatic control 97 



Influence of climatic conditions upon weevil multiplication and 



injury _ i _ _ . 97 



Effect of rains upon development of weevils . '_ . 98 



Effects of wet winter weather on hibernating weevils 99 



Effects of overflows in fields 99 



Laboratory observations upon time weevils will float and endure 



submergence 100 



Probabilities as to influence of climate on weevils in cotton regions 



not now infested 101 



Diseases J 104 



Parasites . . . _ _ 105 



Breeding of parasites 105 



Pediculoicles ventricosus 107 



Predatory enemies 109 



Insects 109 



Birds 110 



Methods of combating the weevil .. 110 



Cultural methods 111 



Futile means 112 



Bibliography 113 



