Geranium macrorrhizum, a potential novel companion plant affecting preference and performance of Myzus persicae on sweet pepper

The combination of a companion plant with cultivated is considered an interesting strategy to reduce pest pressure and, hence, the use pesticides. Although several plants from Alliaceae and Lamiaceae families are known be efficient against aphid pests, only few Geraniaceae family have been studied so far. aim this work was investigate potential effects Geranium macrorrhizum as on colonization sweet pepper (Capsicum annuum, Solanaceae) by green peach (Myzus persicae). Aphid’s orientation behavior, probing behavior life history traits were assessed using host choice preference setup, Electrical Penetration Graph technique clip-cage laboratory bioassays, respectively. disturbance through mechanical stimulation geranium leaves also assessed. composition VOCs G. analyzed SPME technic followed GC–MS. This study revealed that intrinsically repellent but not enough completely mask attractive odor plant. Moreover, negatively impacted fecundity survival rate M. persicae pepper. exacerbated when mechanically stimulated. could due greater amount main germacrone ?-elemenone emitted following stimulation. Our results bring new insights into novel regulate populations.