Apple with scap (IMAGE) Aarhus University Caption Apple infected with apple growers’ fear - apple scab - caused by the fungal pathogen Venturia inaequalis. Apple trees patrolled by wood ants show lower levels of infection compared to trees without wood ants. Credit Joachim Offenberg Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.