CONTENTS. 



Page. 



Life-History Studies on the Codling Moth in Michigan. A. G. Hammar . . 1 



Introduction 1 



Definition of terms used 2 



Seasonal-history studies of 1909 3 



Time of emergence of moths of spring brood 3 



Time of emergence of moths of the first brood 4 



Band-record experiments in 1909 5 



Seasonal-history studies of 1910 6 



Wintering larvae 6 



Spring brood of pupae 8 



Spring brood of moths 11 



The first generation 14 



The second generation 23 



Band records of 1910 I 26 



Summary of seasonal-history studies of 1910 31 



Seasonal-history studies of 1911 32 



Source of rearing material 33 



Winter-killed larvae 33 



Spring brood of pupae 34 



Spring brood of moths 37 



The first generation 42 



The second generation 55 



Band records of 1911 60 



Summary of seasonal-history studies of 1911 65 



Weather records for 1909, 1910, and 1911 66 



Comparative life-history studies for the seasons of 1909. 1910, and 1911 70 



Insect enemies 73 



Predaceous insects 73 



Parasitic insects 74 



Nematode worms 76 



Miscellaneous observations 76 



Number of larval instars and molts of the codling moth 76 



Cannibalism among larvae of the codling moth 83 



Codling moth larvae remaining two seasons in the larval stage 83 



Codling moth larvae feeding on apple foliage 84 



Summary 84 



The One-Spray Method in the Control of the Codling Moth and the 



Plum Curculio (second report). A. L. Quaintance and E. W. Scott. . 87 



Introduction 87 



Experiments in Virginia 88 



The codling moth 89 



The plum curculio 91 



VII 



