Plant extract and extraction.
Commercial plant material (Table 1) was purchased for basic screening from a company which trades in medicinal plants
and spices (Byliny Mikeš, Číčenice, Czech Republic).
Dry plant material was ground using an electric grinder and was subsequently extracted using water.
The highest tested dose (50 g/l) was prepared by macerating 50 g of the plant material in 1 litre of warm water at 25 ± 1°C. The extraction was done at ambient temperature (21 ± 2°C) for 10 hours.
After maceration, the application solution was separated from unmacerated material using a cloth. The application
solution was applied immediately. For better interpretation, doses reported herein are given as the weight of plant material macerated in 1 litre of water