Hello everyone. On Wednesday (11th), I will present our poster by Ignacio Ruiz-Cristi, Dr. Laurence Berville, Dr. Eric Darrouzet.
The use of heat against the invasive hornet Vespa velutina: Toward a biodiversity-friendly method to destroy colonies
Indeed, defensive bee balling (“heat ball”) is particularly pronounced in the Asian honeybees A. cerana in response to hornet attacks.Here, different temperatures and thermal systems were tested on individuals according to their sex, castes, and developmental stages.
First, two temperatures protocols were tested: instantaneous (“Flash”) versus a gradual increase (“Gradual”) to assess the resilience of the hornets. The resilience of individuals decreased significantly with the raised of temperatures. Larvae were the most resistants. Secondly, dry and steam airflow was compared. The most sudden (under 13 sec) and effective method appeared to be when steam is used. This short time frame before death could prevent hornets to react and/or flee. Further studies are necessary to determine the potential use of this method against V. velutina full colonies in natura.
Nearly 3,200 entomologists joined us for over two weeks of on-demand presentations and posters; livestream plenary and symposia; networking video chats; an online exhibit hall.