The effect of spices, essential oils and extracts on the locomotor activity of Porcellio laevis (Isopoda, Porcellionidae)

Abstract

Porcellio laevis Latreille, 1804 plays a significant role in soil formation processes, in particular in the decomposition of organic residues. It is also an important component of food chains. At the same time, when present in excessive numbers, woodlice can act as secondary pests, particularly in the storage of plant products. This study examines the effects of 20 natural aromatic plant materials – spices, essential oils, and plant extracts – on the locomotor activity of P. laevis. The movement of the individuals was analyzed over a 3-min period using a T-shaped experimental chamber. Most of the tested materials significantly reduced the isopod motility compared with the control conditions. Notably, nutmeg, coffee, and basil demonstrated both attractant and deterrent effects, while allspice, clove, essential oils of Mentha piperita and Melaleuca alternifolia, and extract of Petroselinum crispum acted as repellents. These findings highlight the potential of natural aromatic compounds as environmentally friendly means to regulate isopod populations without the use of toxic insecticides