Endophytic Beauveria bassiana in maize affects survival and fecundity of the aphid Sitobion avenae

•Endophytic establishment of Beauveria bassiana was 100% in maize plants.•The survival of Sitobion avenae on inoculated maize plants was reduced up to 49%.•There was no sign of mycosis in dead aphids.•The numbers of S. avenae nymphs were reduced on treated and untreated leaves of inoculated plants.•Negative effects on S. avenae appear to be systemic.