Research project Risk analysis of harmful bark and ambrosia beetles in the belgian context

General introduction

Information on two subfamilies of harmful beetles, namely the bark beetles and ambrosia beetles Scolytinae and Platypodinae, has been gathered in the Scolibe project. The aim was to develop an effective detection and control strategy. Researchers ranked 165 species with a history of invasion based on their potential impact on Belgian trees. This information was used to draw up lists to guide the monitoring strategies, which were then refined using models, practical data, and information about the most suitable traps. The project provides robust, evidence-based guidelines for monitoring (the arrival of) invasive bark beetles and ambrosia beetles in Belgium, early detection and control, so that an adequate response can be made upon discovery.

Research approach

The 165 species known to have a history of invasion were analyzed for their climatic compatibility and the availability of host plants in Belgium, and were ranked based on their potential impact on Belgian trees. The impact of each species was assessed using classifications from the literature, and four priority lists were drawn up to guide monitoring efforts. Field trials tested different trap designs and deployment strategies, revealing that small, widely distributed fan traps were most effective at detecting species diversity. The monitoring strategies were refined using theoretical models and practical data, with a special focus on high-risk locations, such as import locations, and the available resources. Finally, we optimized rapid molecular identification methods for the captured beetles, emphasising the importance of recent, well-preserved samples and suitable PCR primers.

Relevance/Valorization

In the worst case scenario, these beetles can wreak havoc in forests, parks, and tree nurseries. They can travel from country to country hidden under the bark of timber shipments. We investigated which species pose the greatest risk to tree species in Belgium and what their pest status is. Guidelines were drawn up for monitoring and early detection. Field exercises are being organized to inform supervisory authorities about these guidelines in practice.

Financing

FOD Volksgezondheid, Veiligheid van de voedselketen en Leefmilieu