Slugs are significant pests of crops as they can cause great damage to seeds, stems, and leaves. To control slugs, preparations containing the active ingredients metaldehyde and iron (III) phosphate are usually used. However, these preparations are harmful not only to slugs but also to other organisms. Raising awareness among farmers and the public about the harmful effects of synthetic molluscicides has led to an increased demand for alternative methods of slug control. As part of our master's thesis, we investigated the use of plant material from seven invasive plant species to develop an alternative method of slug control. We investigated the contact efficacy (in powder or liquid formulation) and physical barrier efficacy (dried plant material) of seven invasive plant species: Japanese knotweed (Fallopia japonica [Houtt.] Ronse Decr.), Bohemian knotweed (Fallopia x bohemica [Chrtek & Chrtková] Bailey), Canadian goldenrod (Solidago canadensis L.), giant goldenrod (Solidago gigantea Aiton), staghorn sumac (Rhus typhina L.), tree of heaven (Ailanthus altissima [Mill.] Swingle), and false indigo (Amorpha fruticosa L.), against slugs from the Arionidae family. The results of our research showed that plant materials of staghorn sumac, giant goldenrod, and Japanese knotweed affected the feeding ability of slugs. We could not confirm the contact effect of the investigated plant powders and liquid suspensions on slugs in our research. In addition, several plant powders (goldenrod, staghorn sumac) proved to be effective barriers that prevented slugs from reaching a food source.
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