Eight invasive plant species will be tested for their insecticidal (against insects), fungicidal (against fungi), acaricidal (against mites), molluscicidal (against snails) and herbicidal (against weeds) properties. Their impact on beneficial organisms (lady beetles, bees, …) will also be investigated. The most effective extracts will be tested under field conditions at the Biotechnical Faculty (University of Ljubljana) and formulations will be presented in a handbook.