Mold Resistance Genetics

Mold resistance genetics refer to heritable traits that enable cannabis plants to withstand fungal pressure, particularly Botrytis cinerea (gray mold) and powdery mildew. These traits are often polygenic, involving multiple genes that control leaf surface characteristics, trichome density, calyx structure, and volatile terpene production. Breeders working in humid climates or indoor environments have increasingly prioritized mold-resistant lineages to reduce crop loss and dependency on fungicides. Resistance is commonly associated with tighter bud structure, enhanced airflow around flowers, and certain terpene profiles. Documentation of mold-resistant parent material remains inconsistent across breeding programs, making trait stability variable across generations.

Breeders select for mold resistance by crossing cultivars with proven field performance in high-humidity regions or by screening germplasm for trait markers. Stabilizing mold resistance requires multi-generational selection and environmental testing, as expression is heavily influenced by grow conditions, humidity, and plant spacing.