ILLUSTRATIONS. 



PLATES. 



Page. 



Plate I. The codling moth (Carpocapsa pomonella). Fig. 1. — Variation in size 

 of moths of the spring brood. Fig. 2. — Two mollis resting on the 

 trunk of an apple tree, showing protective coloration. Fig. 3. — 

 Larva in winter cocoon. Fig. 4. — Larva in the act of remodelling 

 the winter cocoon. Fig. 5. — Modified winter cocoon, with exit tube 

 and silk partition. Fig. 6. — Cocoon after emergence of moth. Fig. 



7. — Variation in size of wintering larvae 1 



IT. Outdoor shelter used in rearing the codling moth in HMO and 1911 at 



Douglas, Mich 



III. Insect enemies of the codling moth. Fig. 1. — Ascogaster carpocapsse, 

 a hymenopterous parasite of codling-moth larva*. Fig. 2. — Cocoon 

 of Ascogaster carpocapsse within a cocoon of the codling moth. Fig. 

 3. — Pinacodera limbata, a predaceous beetle destructive to codling- 

 moth larva?. Figs. 4, 5. — Tenebroides cortical is, beetle and larva, 

 which feed upon the larva and pupa of the codling moth 74 



TEXT FIGURES. 



Fig. 1. Emergence curve of spring brood of moths in 1909 at Douglas, Mich. 



Records of R. W. Braucher 3 



2. Emergence curve of first-brood moths in 1909 at Douglas, Mich 4 



3. Curves showing maturity of larva? of first and second broods; band- 



record curves of 1909 at Douglas, Mich 5 



4. Device used in obtaining pupal records of the codling moth 8 



5. Diagram showing time of spring pupation of the codling moth in 1910 at 



Douglas, Mich 9 



6. Emergence curve of spring br 1 of moths in 1910 at Douglas, Mich... 12 



7. Emergence curve of summer brood of moths in 1910 at Douglas, Mich.. IS 



8. Cage used in determining feeding period of codling-moth larvae 20 



9. Burlap bands on an apple tree to catch codling-moth larvae 28 



10. Curves made from band-record experiments in orchards at the lake 



shore near Douglas, at Saugatuck, and at New Richmond, Mich., 1910. 30 



11. Diagram to illustrate seasonal history of the codling moth as observed 



during 1910 at Douglas, Mich 32 



12. Curve of spring pupation of the codling moth in 1911 at Douglas, Mich. 35 



13. Curve showing relation of temperature to the duration of the pupal stage 



in the spring brood of the codling moth; Douglas, Mich., 1911 36 



14. Emergence curve of moths of the spring brood in 1911 at Douglas, Mich. 38 



15. Curve showing relation of the temperature to the time of incubation of 



first-brood and second-brood eggs of the codling moth at Douglas, 

 Mich., 1911 45 



16. Emergence curve of moths of the summer brood in I'll I at Douglas, 



Mich 50 



17. Mailing case used for shipping codling-moth larvae 02 



v 



