A chocolate-bar-sized DNA sequencer is helping Australian farmers see an invisible threat before it destroys their crops. Researchers at the Center for Crop and Disease Management (CCDM) have combined spore trapping with advanced genetic sequencing to detect fungicide resistance in airborne samples—a breakthrough that transforms how the grains industry monitors one of agriculture's most pressing challenges.
For years, crop disease resistance monitoring has meant collecting infected plants from the field, bringing them to a lab, and waiting days or weeks for results. It's effective, but slow and limited by where and when researchers can physically collect samples. The new system flips that equation. By analyzing spores already floating through the air, scientists can now detect resistance mutations in real time, across entire landscapes, before they devastate paddocks.
At the heart of the innovation is the MinION, a portable DNA sequencer barely larger than a candy bar that can read pathogen genetics on the fly. Dr. Katherine Zulak, one of the researchers leading the project, explains what this means for disease management: "With the new sequencing technology, we can read the entire fungicide target gene, which means we can detect new or multiple mutations and get a much clearer understanding of their potential impact in the paddock and how resistance is evolving."
The elegance lies in combining two proven technologies—traditional spore traps, used for decades to monitor disease spread, with cutting-edge molecular diagnostics. Associate Professor Fran Lopez-Ruiz, CCDM's fungicide resistance expert, describes it simply: "By bringing together two proven technologies, we've created a smarter monitoring system that can complement existing resistance surveillance efforts." The system has already demonstrated its power, detecting complex resistance mutations in airborne samples, including cases where pathogens carry multiple mutations simultaneously.
This matters because fungicide resistance is a moving target. As farmers spray to control crop diseases like those affecting wheat and barley, pathogens evolve. Without timely information about where and how that resistance is spreading, growers make decisions in the dark—potentially using fungicides that no longer work, wasting money and accelerating resistance further. The new system closes that information gap.
Field trials are now running across Western Australia, Victoria, and South Australia, with researchers collecting air samples throughout the growing season using different types of spore traps. The data will be combined with traditional plant sampling to create detailed maps of where resistance is emerging and how it spreads. That intelligence will flow directly to farmers and agronomists through CCDM's Pesticide Resistance Integrated Mapping tool, giving the industry real-time guidance on fungicide use and disease management strategy.
CCDM Director Professor Mark Gibberd frames the wider significance: "By combining continuous environmental sampling with high-resolution sequencing, we're developing smarter systems to monitor resistance more effectively. This approach provides a more complete picture of what's happening in Australian paddocks and supports efforts to protect crop productivity while ensuring the long-term sustainability of fungicides."
The result is a system that doesn't just tell farmers what resistance exists—it reveals the genetic blueprint of that resistance, enabling smarter, more targeted responses that could help preserve the effectiveness of fungicides for decades to come.