Bud Rot Resistance

Bud rot resistance refers to genetic traits that help cannabis plants resist Botrytis cinerea (gray mold) and related fungal pathogens, which thrive in humid, poorly-ventilated environments. This trait family is not a single gene but rather a collection of morphological and biochemical characteristics—including dense trichome coverage, tight bud structure, and certain volatile compounds—that may reduce infection risk. Breeders working in this category typically select for plants with improved air circulation around flower sites, lower internal bud moisture retention, and naturally occurring antimicrobial terpene profiles. Bud rot resistance is particularly relevant in humid climates and indoor operations where environmental control is challenging. Documentation of resistance claims requires controlled testing, as environmental factors remain primary determinants of infection risk.

Breeders prioritize bud rot resistance by selecting parent plants that demonstrate tight, well-spaced flower architecture and rapid moisture evaporation from buds. This trait is often combined with other disease-resistance markers to develop cultivars suitable for high-humidity or outdoor production systems.