Bui. 86, Bureau of Entomology, U. S. Dept. of Agriculfure. 



Plate II. 



Effects of Plant-bug Attack on Cotton Bolls. 



Fig. 1.— Boll with section of carpel removed to show plant-bug injury. Fig. 2.— Portion of full- 

 grown cotton boll, showing lock of cotton ruined by destruction of seed at apex by Thyanta 

 cuatator. Fig. 3. — Lint partly removed from seeds to show discoloration by cotton stainer (Bys- 

 dercus suturellus); a, Seed and attached lint from uninjured boll; b-c, same from boll dam- 

 aged by cotton stainer, showing lint stained deepest close to seed. Fig. 4. — Decay of seeds in 

 immature cotton boll as a result of feeding by plant-bugs; no external evidence of injury. Fig. 5.— 

 Exterior of cotton boll injured by Calocoris rapidus. Fig. 6.— Cross section of immature cotton 

 seed damaged by Pentatomid bugs. Fig. 7. — Inside of carpel of cotton boll, showing feeding 

 punctures by plant-bugs. (Arrows point to punctures without proliferation.) Fig. 8.— Cotton 

 boll showing external spots referred to on page 16. (Original.) 



