the relationship between female oviposition preference and offspring performance is a key area of study on the evolution of host specificity. this study investigates host prefer-ence of the polyphagous hover fly syrphus ribesii (diptera: syrphidae) and compares it with some components of its offspring`s performance. females and offspring were tested on six naturally used aphid hosts (blackberry...

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...