Uppföljning av insatser mot blomsterlupin samt utvärdering av kunskap hos personer med odlingsmöjligheter

Abstract

Invasive plants are a large and widespread problem that threatens both native flora and fauna. That people unknowingly or knowingly introduce invasive species into new environments is the cause of introduction. Flowering lupine (Lupinus polyphyllus) is a resilient plant that propagates and spreads efficiently, making it difficult to keep away once it has established itself. Länsstyrelsen i Västra Götaland is primarily responsible for control measures of invasive species in protected areas, and in non-protected areas demands are placed on private landowners. Västkuststiftelsen receives financial funds from Länsstyrelsen to carry out control measures where Länsstyreslen does not carry out these themselves. In the essay, control measures against flower lupine carried out by Västkuststiftelsen in the nature reserves Dösebacka and Risvedens vildmark are evaluated. In order to strengthen future control measures, an understanding is created of how gardeners' knowledge looks today and how they relate to stopping the introduction from private gardens and helping the authorities in the fight against invasive species. The work is based on 2 main questions which are answered with the help of a questionnaire study, document study and field visits. Dösebacka nature reserve with a species-rich sandy environment is particularly vulnerable, as it is a favorable environment for the establishment and spread of the flower lupine. Efforts have been carried out several years in a row and methods have been combined that have been both large and comprehensive. In Dösebacka, in 2021, 2022 and 2023, digging was carried out both mechanically and physically in the sand environments, and the stands were mowed twice a year before seeding. In Risveden vildmark, there was a small population of flower lupin along a road. Roadedges act as a path for spread and therefore a first control effort was planned in 2023 to reduce the risk of spread to the reserve with its unique environment. The results show that mechanical and physical digging can effectively reduce the populations of flower lupine in sandy environments, while mowing and digging in the surrounding environment have not been as successful. However, digging accounts for the biggest cost, while mowing is a cheaper option for population control attempts. The evaluation of people with an interest in gardening shows that older people within the surveyed group know more about which species are invasive. Otherwise, no statistically significant correlations are seen between different ages and levels of knowledge in relation to the willingness to help in the combat work.