Plant Immunity

Plant immunity refers to the genetic and physiological mechanisms that enable cannabis plants to resist or tolerate pathogens, pests, and environmental stressors. These traits are polygenic, involving multiple genes that regulate defense pathways such as systemic acquired resistance (SAR) and induced systemic resistance (ISR). Breeders document immunity markers through field observation, pest pressure trials, and increasingly through genetic sequencing. Strong immunity genetics reduce crop losses to powdery mildew, botrytis, spider mites, and other common threats. Understanding these mechanisms helps breeders develop resilient cultivars suited to outdoor, greenhouse, and indoor environments. Immunity traits often correlate with plant vigor and secondary metabolite production, making them valuable breeding targets.

Breeders prioritize immunity markers when selecting parent plants for environmental resilience and reduced input costs. Crossing immune-responsive genetics with desirable cannabinoid or terpene profiles requires multi-generational testing to maintain both trait categories.