Plant Pathogens

Plant pathogens represent disease-causing organisms—fungi, bacteria, viruses, and mites—that affect cannabis cultivation. Understanding pathogen families is critical for breeders selecting for resistance traits and for cultivators implementing preventive protocols. Common fungal pathogens include powdery mildew, botrytis, and fusarium; bacterial pathogens can trigger root rot and leaf spot; viral infections often cause mosaic patterns and stunting. Lineage records frequently report pathogen susceptibility or resistance in breeding lines, particularly for indoor and outdoor environments. Genetic resistance to specific pathogens is a breeding objective in many modern cultivars, though no plant exhibits universal immunity. Knowledge of pathogen biology informs crop rotation, environmental controls, and parent selection in professional breeding programs.

Breeders prioritize pathogen resistance by crossing resistant germplasm with commercially desirable strains, tracking disease outcomes across generations. Resistance traits are often polygenic and environment-dependent, making multi-year field testing essential for reliable selection.