Effects of a triazole fungicide and a pyrethroid insecticide on the decomposition of leaves in the presence or absence of macroinvertebrate shredders

► Microbial litter decomposition and biomass is impacted by propiconazole. ► Macroinvertebrate shredding activity is impacted by alpha-cypermethrin. ► Alpha-cypermethrin reduces the effect of propiconazole on microbial organisms. ► Shredding activity is indirectly impacted by propiconazole via microorganisms.