Pathogen Pressure Selection

Pathogen pressure selection refers to the breeding practice of cultivating cannabis plants under environmental conditions that naturally expose them to fungal, bacterial, or pest pressures, then selectively propagating individuals showing resistance traits. Rather than relying solely on controlled greenhouse conditions, breeders working in this category intentionally maintain humidity, crowding, or pest populations to identify genotypes with inherent resilience. This approach has roots in traditional agricultural breeding and is used to develop lines less dependent on chemical interventions. The aroma profiles of pathogen-resistant cultivars sometimes correlate with secondary metabolites (terpenes and cannabinoids) that may play defensive roles in the plant.

Breeders employing pathogen pressure selection often observe that surviving plants express distinct terpene signatures—potentially linked to their resistance mechanisms. This method helps identify stable genetics for outdoor or low-input cultivation systems, where environmental stress exposure is unavoidable.