ILLUSTRATIONS 



PAGE 

 Frontispiece. Power sprayer and spray boom arranged for spraying cotton 

 for aphis. 

 Sprayer in use in cotton field. 



Fig. 1. The cotton boll weevil ^^'^ 



Fig. 2. Cotton square with bracts spread to show boll weevil puncture 175 



Fig. 3. Arizona wild cotton plant (Thurheria) growing in mountain canyon 



of southern Arizona 1'° 



Fig. 4. The cotton bollworm moth 177 



Fig. 5. The cotton bollworm caterpillar feeding on a cotton boll 177 



fig. 6. The pink bollworm 178 



Fig. 7. Cotton bolls showing difference between injury of common boll- 

 worm and pink bollworm 179 



Fig. 8. Cotton seeds infested by pink bollworm 179 



Fig. 9. The cotton leaf worm 182 



Fig. 10. The salt marsh caterpillar 183 



Fig. 11. The cotton leaf perforator 184 



Fig. 12. Work of cotton leaf perforator on Egyptian cotton leaf 185 



Fig. 13. Egyptian cotton plant showing work of cotton leaf perforator 186 



Fig. 14. Nymph of tarnished plant bug 187 



Fig. 15. Adult tarnished plant bug 187 



Fig. 16. Adult cotton square dauber 187 



Fig. 17. Southwestern cotton stainers 191 



Fig. 18. Work of cotton stainer 191 



Fig. 19. Effects of plant bug attack on cotton bolls 193 



Fig. 20. The brown cotton bug 194 



Fig. 21. The differential grasshopper 194 



Fig. 22. The large cotton grasshopper 195 



Fig. 23. Cotton plants stripped of leaves by differential grasshoppers 196 



Fig. 24. The cotton aphis 197 



Fig. 25. The convergent lady bird, an enemy of the cotton aphis 198 



Fig. 26. Hymenopterous parasite attacking aphis 199 



Fig. 27. Parasitized specimens of aphis 199 



Fig. 28. Work of cotton thrips on seedling cotton plant 200 



Fig. 29. The two spotted red spider 202 



