Many other insects , like the silverfish ( Lepisma saccharina ) or cockroach ( various Blattodea ) , will consume these molds , including degraded paper or the starch-based binding pastes â `` warmth and moisture or high humidity are needed , so damage is more common in the tropics . Many other insects , like the silverfish ( Lepisma saccharina ) or cockroach ( various Blattodea ) , will consume these molds and also degraded paper or the starch-based binding pastes â `` warmth and moisture or high humidity are prerequisites , so damage is more common in the tropics .