negative regulation of basidiospore formation
Any process that stops, prevents, or reduces the frequency, rate or extent of basidiospore formation, a process in which a sexually produced fungal spore is formed on a basidium in the fungi basidiomycetes.
GO:0043942
negative regulation of sexual sporulation resulting in formation of a cellular spore
is_a
GO:0075302
regulation of basidiospore formation
is_a
GO:0034295
basidiospore formation
negatively_regulates