VI DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Page. 

 Plate X. Fig. 1. — Cherry blossom clusters at stage of development when most 



of the eggs of the cherry fruit sawfly are being deposited. Fig. 



2. — Larvse and cocoons of the cherry fruit sawfly 76 



XI. Fig. 1. — Sprayed twig of wild cherry showing larvae of the fall web- 

 worm (Eyphantria cunea) feeding on leaves; at right, same, covered 

 with paper bag, to prevent escape of larvae. Fig. 2. — Unsprayed 

 twig of wild cherry upon which fall webworms have been feeding 



for some time; for comparison with sprayed twig S4 



XII. Stages and work of the fruit-tree leaf -roller (Archips argyrospila). 

 Fig. 1. — Hatched egg masses on apple twigs. Fig. 2. — Full grown 

 larva. Fig. 3. — Pupae. Fig. 4. — Cocoon and pupal case. Fig. 

 5. — Young apples injured by larvae. . . 94 



XIII. Work of the fruit-tree leaf -roller. Fig. 1. — Apple branch, showing 



webbing and injury to foliage by larvae. Fig. 2. — Apples injured 



by larvae 94 



XIV. Apple orchard at Canon City, Colo., defoliated by the fruit-tree leaf- 



roller 94 



XV. Excessive webbing by larvae of the fruit-tree leaf-roller 94 



XVI. Stages of the fruit-tree leaf -roller. Fig. 1. — Egg masses on trunk of 

 apple tree. Fig. 2. — Moth and extruded pupal case. Fig. 3. — 

 Unhatched egg masses on apple twigs 98 



TEXT FIGURES. 



Fig. 1. The grape leafhopper ( Typhlocyba comes var. coloradensis): Adult 1 



2. The grape leafhopper: Nymph of the first stage 2 



3. The grape leafhopper: Fully developed nymph of the fifth stage 2 



4. Map showing distribution of the grape-berry moth (Polychrosis viteana) . . 20 



5. Injury to grape cluster by larva of grape-berry moth during and just 



after the blooming period 24 



6. Pupal cases made on grape leaf by full-grown larvae of the first brood of 



the grape-berry moth 24 



7. Cluster of Concord grapes on which many second-brood eggs of the grape- 



berry moth are present . 25 



8. The grape curculio (Craponius inasqualis): Adult, larva, pupa 26 



9. Work of the grape curculio in berry of grape 27 



10. Diagram showing time of emergence of spring-brood moths of the grape- 



berry moth in 1909 at North East, Pa 30 



11 . Diagram showing time of emergence of the first-brood moths of the grape- 



berry moth in 1909 at North East, Pa 35 



, 12. Diagram showing time of leaving the grape berries by second-brood 

 larvae of the grape-berry moth, from fruit collected in the field, North 

 East, Pa., 1909 40 



13. Diagram showing time of emergence of the first-brood moths of the grape- 



berry moth in 1907 at North East, Pa 42 



14. Diagram showing time o£ emergence of the spring-brood moths of the 



grape-berry moth in 1908 at North East, Pa 43 



15. Seasonal history of the grape-berry moth as observed in 1909 at North 



East, Pa 45 



16. Thymaris slingerlandana, a common parasite of the grape-berry moth. . . 46 



17. Vineyard in which poison-spray experiments were conducted against 



larvae of the grape-berry moth during the seasons of 1907, 1908, and 

 1909: vinevard of Mr. W. S. Wheeler, North East, Pa 53 



