Viral Resistance Screening

Viral resistance screening refers to the systematic evaluation of cannabis plants for their ability to withstand or tolerate viral pathogens, particularly those affecting cannabis cultivation such as hop latent viroid (HLV) and cannabis sativa virus (CaCV). This practice has become increasingly important in breeding programs as viral infections can significantly reduce yield, potency consistency, and plant vigor across generations. Breeders working in this category conduct controlled exposure testing and genetic analysis to identify lines showing greater tolerance to viral infection. Understanding viral resistance traits helps inform parent selection and crosses aimed at producing more robust commercial and breeding stock. This screening approach is distinct from general disease resistance work and requires specialized propagation protocols to maintain test accuracy.

Breeders incorporate viral resistance data into parent selection to reduce crop losses and improve reliability of seed lines and clones. Resistance or tolerance traits identified through screening become key criteria in developing stable varieties for environments where viral pressure is documented.