Toxicity and action mechanisms of silver nanoparticles against the mycotoxin-producing fungus Fusarium graminearum

•AgNPs possess high activity towards fungicide-resistant strains.•AgNPs exert great activity against mycotoxin-producing fungus F. graminearum.•AgNPs induce the expression of two azole resistance-related ABC genes.•AgNPs lead to accumulation of toxisome and notorious mycotoxin DON by provoking ROS.•AgNPs combined with DON-reducing fungicides are recommended for FHB control.