Rhizoctonia Resistance

Rhizoctonia resistance refers to genetic traits that enable cannabis plants to withstand infection by Rhizoctonia solani, a soil-borne fungal pathogen responsible for damping-off disease in seedlings and root rot in mature plants. This resistance is often polygenic, involving multiple genes that contribute to root vigor, lignification, and natural antimicrobial compounds in root tissues. Breeders have identified resistance markers in certain landrace and modern cultivars, though the trait varies significantly across genetic backgrounds. Selection for rhizoctonia tolerance is particularly relevant in outdoor and high-humidity cultivation environments where fungal pressure is highest. This trait remains understudied in formal cannabis breeding literature compared to powdery mildew or botrytis resistance, but grower observation and breeding programs continue to accumulate data on susceptibl

Breeders working to develop disease-resilient cultivars often screen seedlings and rooted cuttings under controlled fungal pressure or in infested substrate. Incorporating rhizoctonia resistance into commercial and landrace crosses requires multi-generational selection and environmental challenge testing, making it a longer-term breeding objective.