ILLUSTRATIONS. 



PLATES. 



Page. 

 Plate I. Work of the pear thripa {Euthrips pyri Daniel). Fig. 1. — Imperial 

 prune, showing buds and blossoms injured by feeding of adult 

 thrips. Fig. 2. — Unfolding leaves of Hemskirk apricot injured 

 by young thrips. Fig. 3. — Madeline pear, showing cup-shaped 

 deformities of the larger and rolling of the smaller leaves, the injury 



caused by young thrips 6 



II. Work of the pear thrips. Fig. 1. — Black Tartarian cherry blossoms 

 killed by adult thrips and leaves injured by young thrips. Fig. 

 2. — Bartlott pear, showing all except very late blossoms dead from 

 thrips and leaves injured by feeding of young thrips 6 



III. Stages and work of spring canker-worm {Paleacrita vemata Peck). 



Fig. 1. — Egg mass on bark scale. Fig. 2. — The larvae or canker- 

 worms. Fig. 3. — Pupse. Fig. 4. — Female moths. Fig. 5. — Male 

 moth. Fig. 6. — Work of canker-worms on apple leaves when small. 

 Fig. 7. — Later work of the larvae, only the midribs of leaves being 

 left 18 



IV. Trees defoliated by spring canker-worms and effects of treatments. 



Fig. 1. — Defoliated trees in Lupton orchard. Fig. 2. — The same 

 trees a year later. Fig. 3. — Defoliated trees in the Purcell orchard. 

 Fig. 4. — An adjacent row of trees protected by applications of 



arsenate of lead 20 



V. Work of the trumpet leaf-miner of the apple {Tischeria malifoliella): 



Larval mines in apple leaf 2G 



VI. The lesser peach borer {Synanlhedon pictipcs). Fig. 1. — Male and 

 female moths. Fig. 2. — Cocoons as exposed by removing bark 

 from trunk of peach tree. Fig. 3. — Trunk of 10-year-old peach 



tree badly infested with the larvae 34 



VII. Work of the lesser apple worm {Enarmonia prunirora). Fig. 1. — 

 Apples showing surface injury by lesser apple worm. Fig. 2. — 

 Portions of apples showing, in lower figures, injury at calyx and 

 stem ends; in upper figures, injury to flesh under blotch mines. . 54 

 VIII. Vines injured by grape root-worm compared with uninjured vines. 

 Fig. 1. — Six-year planted vines making but a weak growth, because 

 of injury to roots by grape root-worm. Fig. 2. — Two-year planted 

 vines not yet attacked by grape root- worm G4 



IX. Vines injured by grape root-worm compared with uninjured vines. 

 Fig. 1. — Young \anes almost ruined by feeding of grape root-worm 

 upon their roots. Fig. 2. — A normally thrifty vineyard at North 



East, Pa. , uninfested l)y grape root- worm 64 



X. Work of the peach-tree barkbeetle {Phlaotribiis liminaris). Fig. 1. — 

 Gum exuding through burrows made in bark of peach tree. 



Fig. 2.— Exit holes in bark of peach tree 92 



vit 



