Stink Bug (image) Penn State Caption Brown marmorated stink bugs have caused millions in crop losses across the United States as a result of the damage their saliva does to plant tissues during feeding. Researchers at Penn State have developed methods for extracting the saliva of these insects and have identified the major protein components of this saliva. Credit Nick Sloff, Penn State Usage Restrictions non commercial use only Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.