Hop Latent Viroid (HLVd) RT-qPCR Detection & Mother-Stock Quarantine SOP
Hop Latent Viroid (HLVd) is a 256-nucleotide circular single-stranded RNA pathogen that causes asymptomatic vegetative stunting ('dudding') and reduces flower yield and THCA/terpene biosynthesis by 30% to 50%; reliable eradication requires multi-site root and basal petiole RT-qPCR screening across 3 consecutive quarantine weeks paired with 10% household bleach (0.5% to 0.6% sodium hypochlorite) pruning-shear sterilization.
Quantitative Reference Matrix
| Diagnostic / Quarantine Parameter | Non-Compliant / High-Risk Practice | Verified CannaApp HLVd Quarantine SOP | Scientific Rationale |
|---|---|---|---|
| Tissue Sampling Site | Single upper fan leaf from apical tip | Composite sample: 2 feeder root tips + 2 basal/mid petioles | HLVd titer accumulates earliest and highest in phloem & root tissue |
| Quarantine Testing Cadence | Single test on Day 1 of clone arrival | 3 consecutive RT-qPCR tests at Week 0, Week 3, and Week 6 | Low-titer latent infections require 14-21 days to cross qPCR LoD |
| RT-qPCR Cycle Threshold (Ct) | Qualitative visual check only | Negative: Ct > 35 (or Undetermined) / Positive: Ct <= 32 | Internal plant NAD5 mRNA control confirms intact RNA extraction |
| Pruning Tool Disinfection | 70% Isopropanol (IPA) or Ethanol wipe | 60-second soak in fresh 10% bleach solution (0.55% NaOCl) | Alcohol does NOT cleave circular viroid RNA; oxidative NaOCl is required |
| Cross-Border EU Mail Status | Shipping flowering THC buds | 100% Legal EU-Wide (0.0% THC root/petiole tissue in silica) | Non-narcotic vegetative tissue travels by standard post across all EU states |
Frequently Asked Questions
Unlike enveloped viruses or bacteria that have lipid membranes or protein capsids denatured by alcohol, HLVd is a naked, covalently closed circular RNA molecule. Only strong oxidizers such as freshly diluted sodium hypochlorite (10% household bleach) or Virkon S degrade the RNA backbone.
Yes. Root tips and fan-leaf petioles from vegetative mother plants contain 0.00% THC and zero glandular trichomes, making them non-narcotic plant pathology specimens permitted in standard intra-EU postal mail.
Create Account with Email & Order Test
Sign in or create your Client Portal account with email first, then order any lab service and mint blind barcodes.
Ask a Question
Need custom B2B club onboarding, volume packs, or supplier lab API integration? Message our analytical desk.