Disease Susceptibility

Disease susceptibility in cannabis refers to a plant's genetic predisposition to develop fungal, bacterial, or viral infections under specific environmental conditions. This trait is not a terpene itself, but rather a phenotypic expression influenced by genetics, cultivation environment, and pathogen pressure. Understanding disease susceptibility is essential for breeders selecting parent plants, as resistance traits often correlate with secondary metabolite profiles and plant structure. Strains with documented susceptibility to powdery mildew, botrytis, or root pathogens are cataloged by breeders to avoid these lineages or to cross them strategically with resistant genetics. Environmental factors—humidity, airflow, temperature—interact with genetic predisposition, making disease susceptibility a breeding consideration rather than a fixed terpene marker.

Breeders track disease susceptibility patterns across lineages to identify resilient parent material and avoid propagating vulnerable genetics. Strategic crosses often pair susceptible phenotypes with disease-resistant cultivars to maintain desired traits while improving overall plant health and cultivation reliability.