Biological Means : A substance controlling harmful organisms is considered as an active substance acting by biological means when the control action directly involves living micro-organisms (biological means)
Health and Safety Executive (HSE), Glossary of Terms on Biocides and Pesticides, HSE, Merseyside, England, UK 2013. http: //www.hse.gov.uk/biocides/glossary.htm, (Hlth and Sfty - Brit) {701}