A field trial was conducted at the Institute of Forage Crops (Pleven, Bulgaria) from 2015 to 2017. It studied effects natural products on Acyrthosiphon pisum density, as well changes in chemical composition, content plant fibre components and enzyme degradability forage pea. Treatments with insecticides Madex Agricolle, applied alone or combination organic fertilizers Lithovit Nagro were perfor...