Page. 

 Development — Continued. 



Thermal influence npon 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 svaccessf ully 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 



Sorae reasons for early destruction of stalks . . 92 



Dissemination . . . . _ . . 94 



Weevils in seed houses at ginneries 94 



Natural control . 95 



Mechanical control 95 



Pilose obstacles to weevil progress 95 



Destruction of larvtB and pupae in bolls and squares by abnormal 



plant growth _ . . . 96 



Climatic control 97 



Influence of climatic conditions upon weevil multiplication and 



injury . 97 



Effect of rains upon development of weevils 98 



Effects of wet winter weather on hibernating weevils 99 



Effects of overflows in fields 99 



Lalioratory 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 104 



Parasites - . 105 



Breeding of parasites . 105 



Pedicidoides ventricosiiH 107 



Predatory enemies . \ 109 



Insects 109 



Birds ... 110 



Methods of combating the weevil .....^ 110 



Cultural methods 111 



Futile means . . , 112 



Bibliography 1 113 



