Green synthesis and immobilization of AgNPs by lumpy corn stalk as interlayer filling material for durable antibacterial

•AgNPs were in situ synthesized with corn stalk (CS) as reducer and stabilizer.•The obtained CS@AgNPs could be used to protect plywood from bacteria erosion.•The antibacterial activities of CS@AgNPs were durable than Ag+ spray and hydrogel.•The accumulative release rate of AgNPs from CS@AgNPs was low and safe.•The plywood with CS@AgNPs could keep efficient antibacterial activity in 21 days.