The Canadian Food Inspection Agency (CFIA) announced in its 2026-2027 Departmental Plan that high-throughput sequencing (HTS) technology will be implemented at the Centre for Plant Health in Sidney, British Columbia, this year. This is a significant milestone for plant health diagnostics in Canada, and one that will reshape how the country detects, identifies, and responds to plant pests and diseases.
For growers, nursery operators, and diagnostic labs across Canada, this rollout marks a shift from targeted testing, where you look for a specific pathogen you suspect, to surveillance-level screening, where a single test can potentially identify every virus, viroid, bacterium, and fungus present in a sample.
What Is High-Throughput Sequencing?
High-throughput sequencing, sometimes called next-generation sequencing (NGS), is a technology that reads millions of DNA or RNA sequences simultaneously from a single sample. In the context of plant health, this means that instead of running separate tests for each suspected pathogen (one test for Tomato brown rugose fruit virus, another for Potato spindle tuber viroid, another for Clavibacter, and so on), HTS can detect all of them in a single run.
The technology works by extracting total nucleic acid from a plant sample, fragmenting it, sequencing all the fragments, and then using bioinformatics to compare the sequences against databases of known pathogens. Any pathogen present in the sample, including ones you were not specifically looking for, can theoretically be detected.
This capability is particularly valuable for regulatory agencies like the CFIA that need to screen imported plant material for a wide range of potential threats. Traditional diagnostic workflows require prior knowledge of what might be present, which means novel or unexpected pathogens can slip through. HTS removes that limitation.
Impact on Plant Pest Surveillance
Canada’s plant health surveillance system currently relies on a combination of visual inspection, serological testing (ELISA), PCR, and traditional culturing methods. Each of these has strengths, but they all share one limitation: they are targeted. You need to decide what to test for before you run the test.
HTS changes this paradigm. The CFIA’s implementation at the Centre for Plant Health will enhance early detection capabilities for both known regulated pests and previously uncharacterized organisms. This is especially important given that global plant trade continues to introduce new pathogen risks to Canadian agriculture and forestry.
The Centre for Plant Health already serves as Canada’s primary reference laboratory for plant virus identification and post-entry quarantine testing of imported woody plant material. Adding HTS capacity to this facility positions Canada to detect novel threats at the border before they establish in the broader landscape.
Complementary Role of Traditional Diagnostics
It is important to understand that HTS will complement, not replace, existing diagnostic methods. HTS excels at broad-spectrum detection and discovery, but it has limitations in terms of cost, turnaround time, and the specialized bioinformatics expertise needed to interpret results.
For day-to-day diagnostics at the grower and nursery level, rapid field tests remain the most practical first line of defense. ImmunoStrip tests for pathogens like ToBRFV provide results in minutes without any lab equipment, making them ideal for incoming shipment screening, field scouting, and quality assurance programs.
Similarly, ELISA-based assays like reagent sets for ToBRFV and reagent sets for CMV continue to offer the best combination of throughput and cost for routine certification testing. When you need to test hundreds of samples for a specific pathogen, ELISA is hard to beat.
Isothermal amplification platforms like AmplifyRP XRT for Clavibacter and AmplifyRP XRT for Cms bridge the gap between rapid field tests and full laboratory PCR, offering molecular-level sensitivity in a format that does not require a thermocycler.
The practical diagnostic workflow going forward will likely be layered: HTS for regulatory surveillance and novel pathogen discovery at the national level, PCR and isothermal methods for confirmatory testing and targeted screening at the regional level, and rapid immunoassays for field-level decisions and routine monitoring at the farm level.
Implications for Nursery Certification
Nurseries that participate in clean stock programs, whether for fruit trees, grapevines, seed potatoes, or ornamentals, should pay attention to how HTS adoption may change certification requirements over time. As the technology matures and costs decrease, it is possible that HTS-based screening could become part of the certification process for high-value propagative material.
This would be a net positive for the industry, as it would catch infections that current targeted tests miss. However, it would also require nurseries to prepare for the possibility that previously undetected pathogens might be found in material that has been passing conventional tests for years. The transition period will require clear communication between regulators and industry about what constitutes an actionable detection versus a finding that requires further investigation.
CFIA Priorities for 2026-2027
The HTS implementation is part of a broader suite of plant health priorities outlined in the CFIA’s departmental plan. The agency will also continue promoting awareness of invasive plant pests, including spotted lanternfly, oak wilt, emerald ash borer, Japanese stiltgrass, Japanese beetle, plum pox virus, and hemlock woolly adelgid.
These pests and diseases represent a diverse range of threats to Canadian agriculture and forestry, and the common thread is that early detection is the key to effective management. Whether detection comes through visual surveillance, traditional diagnostics, or cutting-edge sequencing technology, the goal is the same: find the problem before it becomes an outbreak.
For Canadian growers and nursery operators, the CFIA’s investment in HTS is encouraging. It signals a commitment to staying ahead of emerging threats and leveraging the best available technology for plant health protection. In the meantime, maintaining robust in-house or contracted testing programs using proven diagnostic tools remains the best defense at the operational level.
