LLUSTRATIONS 
PLATE. 
Page. 
Plate I. Fig. 1. — Geared traction sprayer, suitable for the treatment of sugar 
beets against the Hawaiian beet web worm 8 
Fig. 2. — Geared traction sprayer in operation in sugar-beet field 8 
TEXT FIGURES. 
Fig. 1. The Hawaiian beet web worm {Hymenia fascialis) : Female moth 3 
2. The Hawaiian beet web worm: Egg. larva, pupa, details 4 
3. The southern beet webworm (Pachyzancla bipunctalis) : Moth, larva, 
pupa, details 19 
4. The imported cabbage webworm (Hellula undalis): Adult, larva, pupa. 28 
5. The imported cabbage webworm: Wing venation; head and antenna. . 28 
6. Exorista pyste. a parasite of the imported cabbage webworm 31 
7 . Small compressed-air sprayer 38 
8. Porosagrotis vetusta: Moth, larva 50 
9. The sugar-beet webworm (Loxostege sticticalis) : Moth 58 
10. The garden webworm (Loxostege similalis): Moth, larva, pupa, details. . 58 
11. A medium-sized sugar-beet plant defoliated by the sugar-beet web- . 
worm in July 60 
12. Sugar beets defoliated by the sugar-beet webworm in July 61 
13. Large sugar-beet plants, showing defoliation and weakened roots due to 
attack by the sugar-beet webworm in August 62 
14. Field of young sugar beets destroyed by the sugar-beet webworm in 
June 63 
15. Barrel sprayer suitable for use against the sugar-beet webworm 64 
16. Barrel sprayer in action against the sugar-beet webworm 65 
17 . Four-row attachment for beet sprayer 67 
18. Four-row attachment for beet sprayer 67 
19. Four-row attachment for beet sprayer 67 
20. Geared traction sprayer suitable for use against the sugar-beet webworm . 68 
21. Geared traction sprayer in action against the sugar-beet webworm 68 
22. Filling a traction sprayer for spraying against the sugar-beet webworm . . 69 
23. Type of Vermorel nozzles suitable for spraying sugar beets against the 
sugar-beet webworm 69 
24. The horse-radish webworm (Plutella armoracia): Adult or moth, side 
view and with wings spread 72 
25. The horse-radish webworm: Larva, lateral and dorsal views 72 
26. The horse-radish webworm: Pupa 73 
27 . The horse-radish webworm : Cocoon 73 
ERRATA. 
Page 33, line 7, for Agrostis read Agrotis. 
Page 72, line 14, for scale like read scale-like. 
Page 76, last sentence, read, In this garden the larvx have evidently been prevented by 
a hymenopterous parasite from causing much damage, and at present no artificial control 
measures are necessary. 
v 
