Pathogen Susceptibility

Pathogen susceptibility in cannabis refers to a plant's genetic predisposition to infection by fungi, bacteria, viruses, or mites. This trait is not a terpene itself, but rather a phenotypic expression influenced by cannabinoid and terpene profiles, as well as broader plant biochemistry. Breeders studying disease resistance have observed correlations between certain monoterpene-dominant cultivars and increased vulnerability to powdery mildew, botrytis, and spider mites. Conversely, some lineages with higher sesquiterpene concentrations or robust resin production show improved pathogenic barriers. Understanding susceptibility patterns is critical for breeding resilient cultivars, especially in outdoor and high-humidity growing environments where disease pressure intensifies.

Breeders employ pathogen-susceptibility mapping to identify parent lines with natural resistance traits, then combine them through selective crossing. Cultivars selected for disease resilience often show distinct terpene profiles and secondary metabolite concentrations that correlate with reduced infection rates.