Acorns (IMAGE) Cary Institute of Ecosystem Studies Caption Bottom-up control -- Acorn abundance can be used to forecast rodent numbers and tick-borne disease risk. Credit Pamela Freeman Usage Restrictions To promote this press release. 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.