What Is HLVd (Hop Latent Viroid)?
HLVd is a single-stranded RNA pathogen that infects cannabis plants and causes "dudding disease." First identified in hop plants in 1988, it jumped to cannabis — where it has become the cannabis industry's most destructive pathogen.
Infected plants show reduced vigor, smaller leaves, loose bud structure, and stunted growth. HLVd spreads through root-to-root contact, making it critical to screen clones before planting.
Why Test for HLVd?
HLVd can devastate yields and plant health. Testing ensures your clones are free of this pathogen, protecting your investment and crop success.
How Clone Source Tests for HLVd
Mother stock is screened by molecular PCR for HLVd, Fusarium, and Pythium, and all 39 catalog records carry an HLVd-tested flag in our production inventory record. Testing documentation for the specific record you're ordering is available on request before fulfillment — ask, and review it before you commit.
Learn more about our testing standards and how to identify HLVd symptoms in your grow.