negative regulation of aecium development
Any process that stops, prevents, or reduces the frequency, rate or extent of aecium development, a process in which a cuplike structure containing chains of aeciospores is formed.
GO:0075262
negative regulation of spore-bearing organ development
is_a
GO:0075268
regulation of aecium development
is_a
GO:0075267
aecium development
negatively_regulates