Hop Latent Viroid (HLVd): What Every Grower Should Know

Plantlet in Tissue Culture

What Is HLVd?

Hop Latent Viroid (HLVd) is one of the most significant pathogens affecting cannabis cultivation today. Unlike fungi or bacteria, a viroid is an extremely small infectious RNA molecule that can spread silently through a production facility.

Many infected plants appear healthy while still carrying the viroid.

Common Symptoms

Symptoms may include:

• Reduced vigor

• Slower growth

• Smaller flowers

• Lower yields

• Reduced rooting success

• Weak branching

• Variable plant appearance

Symptoms vary among cultivars, making laboratory testing the most reliable method of detection.

How It Spreads

HLVd is commonly spread by:

• Pruning tools

• Mother plant propagation

• Mechanical handling

• Shared irrigation equipment

Because infected cuttings can appear healthy, prevention and routine testing are important management strategies.

Prevention

Best practices include:

• Regular testing

• Sanitation protocols

• Dedicated tools

• Quarantine procedures

• Clean propagation stock