What is the resistant survival structure for brown rot?

The resistant survival structure for brown rot, specifically caused by the fungal pathogens responsible for this disease, is primarily the "mummies." Mummies are the dried, shriveled remains of fruit that have been infected by the fungus. They can harbor the pathogen and serve as a source of inoculum in subsequent growing seasons.

The other options represent different fungal structures or forms, but they do not specifically relate to the brown rot pathogens. Sclerotia are hardened masses of fungal mycelium that can survive adverse conditions, but they are more associated with certain other fungi. Apothecia are fruiting bodies of certain fungi and are involved in the sexual reproduction of some fungal species, but they are not specifically linked to brown rot pathogens. Conidia are asexual spores produced by many fungi, and while they can also be involved in disease cycles, they are not the primary means of survival for the brown rot pathogens during unfavorable conditions.