Mold Susceptibility Genetics

Mold susceptibility in cannabis genetics refers to inherited traits that influence a plant's vulnerability to fungal pathogens, particularly Botrytis cinerea (bud rot) and powdery mildew. This phenotype is polygenic—controlled by multiple genes—making it a complex breeding consideration rather than a single trait. Dense flower structures, high humidity tolerance, and terpene profiles are commonly associated with increased mold pressure in cultivation records. Breeders working in humid climates or indoor operations frequently prioritize mold-resistant genetics to stabilize crop outcomes. Understanding susceptibility markers helps inform parent selection and environmental management strategies.

Breeders actively select for mold-resistant phenotypes by crossing strains with historically lower disease incidence, improved air circulation traits, and terpene profiles associated with fungal resistance. Lineage records and cultivation data from breeding programs help identify genetic lineages more suitable for high-humidity or dense-canopy environments.