ILLUSTRATIONS 



PLATES. 



Page. 

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

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

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

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

 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 



II. Outdoor shelter used in rearing the codling moth in 1910 and 1911 at 



Douglas, Mich 6 



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

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

 of Ascogaster carpocapsx within a cocoon of the codling moth. 

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

 ling-moth larvse. Figs. 4, 5. — Tenebroides corticalis, beetle and 



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



IV. Fig. 1. — Picked apples from three trees of Plat I (demonstration) in 

 the Edward Hutchins orchard, Fennville, Mich. Fig. 2. — Picked 

 apples from three trees of Plat III (one spray) in the Edward 

 Hutchings orchard, Fennville, Mich. Fig. 3. — Picked apples from 

 three trees oi Plat V (unsprayed) in the Edward Hutchins orchard, 

 Fennville, Mich 96 



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 of moths in 1909 at Douglas, Mich 4 



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



record curve of 1909 at Douglas, Mich 5 



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



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



Douglas, Mich 9 



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



7. Emergence curve of summer brood of moths in 1910 at Douglas, Mich . . 18 



8. Cage used in determining feeding period of codling-moth larvae 26 



9. Burlap bands on 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 



IX 



