ILLUSTRATIONS 



PLATES. 



Pagft. 



Plate I. Leafhoppers (Eutettix spp.) and their work. Fig. 1. — Eutettix 

 tenella: a, Adult; b, nymph; c, wing; d, e, genitalia;/, eggs 

 (greatly enlarged); g, section of beet stem, showing fresh eggs in 

 place; h, same, showing eggs ready to hatch ; i, old egg scars on beet 

 stems; j, small leaf of sugar beet, showing characteristic "curly- 

 leaf" condition; k, enlarged section of back of an extreme case of 

 "curly-leaf," showing "warty" condition of veins. Fig. 2. — Eu- 

 tettix strobi: a, Work of nymphs on lamb's-quarters; 6, work of 

 nj'mphs on sugar beet. Fig. 3. — Eutettix sciivla: Adult. Fig. 4. — 

 Eutettix clarivida: a, Wing; b, head and pronotum; c, d, genitalia. 

 Fig. 5. — Eutettix nigridorsum: Work of nymphs on leaf of Helian- 

 thus. Fig. 6. — Eutettix straminea: Work of nymphs on leaf of 

 another Helian thus. Fig. 7. — Eutettix insana: Wing. Fig. 8.— -Eu- 

 tettix stricta: a, b, Genitalia 34 



II. Work of Eutettix tenella on sugar beet. Fig. 1. — Three "curly-leaf" 

 beets, the result of attack by Eutettix tenella, and one normal beet 

 from the same field, showing difference in size. Figs. 2, 3. — 

 "Curly-leaf" beets as seen in the field. Fig. 4. — Normal beets 

 from same field 44 



III. Work of Eutettix tenella on sugar beet. Fig. 1. — A large beet becom- 

 ing "curly." Fig. 2. — Back of a leaf affected by "curly-leaf," 

 showing ' ' warty " condition and curled edges 44 



IV. \\ork of Eutettix tenella on sugar beet. Fig. 1. — A field of beets de- 

 stroyed by "curly-leaf." Figs. 2, 3. — Cages used in the life-his- 

 tory experiments .' 46 



V, Spraying apparatus used in hopyards in British Columbia 84 



VI. View of hopyard, showing sheep keeping down weeds 88 



VII. Method of capturing hop flea-beetles on tarred horse-sledges 90 



TEXT FIGURES. 



Fio . J . The asparagus miner {Agromyza simplex) : Fly I 



2. The asparagus miner: Larva, pupa, work 2 



3. The water-cress sowbug ( Mancasellus brachyurus) 12: 



4. Cross section of cress pond, showing arrangement for avoiding damage 



by water-cress sowbug 13^ 



5. The water-cress leaf-beetle {Phxdon aruginosa): Larva, pupa, adult J 7 



6. The cranht'Tvy ?pAnworm (Clcora pampinnria): Moth, larva, and pupa. . 22 



7. The striped garden caterpillar {Mamestra Icgitima): Moth, larva, and 



pupa 29- 



8. The semitropical army worm (Frodenia cridania): Moth, egg, egg-mass, 



larvae 54 



12 



