Botrytis Resistance Markers

Botrytis resistance markers refer to genetic and phenotypic traits that breeders observe in cannabis lines showing reduced susceptibility to Botrytis cinerea (gray mold), a common fungal pathogen in cannabis cultivation. These markers are not a single gene but rather a cluster of traits—including dense trichome production, low leaf surface moisture retention, and certain volatile terpene profiles—that correlate with field resistance in mold-prone environments. Breeders working in humid climates or outdoor production have increasingly selected for these characteristics to reduce crop loss. Lineage records frequently report botrytis tolerance in strains with Afghani or Hindu Kush ancestry, which evolved in naturally arid regions. Understanding these markers helps breeders make informed crosses when disease pressure is a primary cultivation challenge.

Breeders intentionally stack botrytis resistance markers through selective crossing, particularly when developing cultivars for wet climates or outdoor seasons. Phenotypic selection for tight bud structure, rapid bud maturation, and terpene chemistry that inhibits fungal colonization has become a recognized breeding objective in regions with high disease incidence.