negative regulation of appressorium formation
negative regulation of appressorium formation on or near host
related
Any process that stops, prevents, or reduces the frequency, rate or extent of symbiont appressorium formation.
GO:0051093
negative regulation of developmental process
is_a
GO:0075017
regulation of appressorium formation
is_a
GO:0075016
appressorium formation
negatively_regulates