Stink bugs (Nezara viridula, Acrosternum hilare, and Euschistus servus) were exposed to small- and medium-sized bolls for 24 hours. Bolls were examined for external and internal evidence of feeding at 2, 4, 6, 8, and 10 days after feeding. Results showed no relationship between numbers of external marks and internal warts. Therefore, external marks cannot be used accurately as an indicator of internal damage. Neither size nor number of external marks or warts increased significantly among the five post-feeding sampling dates. All evidence of damage is present by the second day. Results from a smaller study indicate that all symptoms of damage are present in some form within 24 hours, and all but lint damage present within 12 hours. There was a significant increase in lint and seed damage through time. Finally, a strong relationship exists between stylet sheath and wart number. A regression equation was generated to predict the presence of internal damage (warts) from the number of stylet sheaths.