Tomato hornworm caterpillar (IMAGE) Penn State Caption Researchers have discovered that tomato fruitworm caterpillars silence their food plants' cries for help as they devour their leaves. Credit Nick Sloff, Penn State Usage Restrictions None License Licensed content 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.