Lopst is ecofriendly biological insecticide based on naturally occurring entomo-pathogenic fungus Beauveria bassiana. Lopst is recommended mainly for the control of chewing pests, white fly and different beetles.

When spores of the Beauveria bassiana come into contact with the body of an insect host, they germinate, enter the body, and grow inside, eventually killing the insect. Afterwards a white mold grows on the cadaver and produces new spores.