Danish researchers are racing against time to develop drone and AI weapons against the oak processionary moth, a toxic caterpillar spreading across Denmark. They have just two weeks left before larvae disappear for the year.
The oak processionary moth has earned itself a grim nickname in Danish media: “Larven fra Helvede,” the larva from hell. It’s not hard to see why. The caterpillar’s microscopic barbed hairs can trigger severe skin reactions, allergic symptoms, and breathing problems. Municipalities are burning through resources trying to locate and eliminate nests while residents nervously eye the oak trees in their neighborhoods.
I’ve watched Denmark grapple with invasive species before, but this one has municipalities genuinely scrambling. The lack of effective tools has forced them into reactive mode, chasing outbreaks rather than preventing them. That’s about to change if researchers at the University of Southern Denmark have their way.
A Two Week Window
Henrik Skov Midtiby, a lecturer at the Mærsk Mc Kinney Møller Institute, is leading a team working frantically to study the larvae before they vanish. “We have a very short time window,” he explains. The experiences and recordings they gather now will form the foundation for tools that make future control efforts faster, safer, and more effective.
The timing is brutal. By mid August, the larvae will be gone. The next chance to collect field data won’t come until next summer. So right now, researchers are shadowing municipal extermination teams in Odense, documenting their work processes and identifying where technology can add the most value.
Thermal Cameras Show Promise
The early results are encouraging. As reported by Ritzau, thermal cameras appear to detect nests more easily than conventional photography. Under the right conditions, the nests register as warmer than their surroundings. Against tree bark, where they normally blend in perfectly, that temperature difference makes them stand out clearly.
The researchers are now systematically testing when that temperature difference peaks and how thermal cameras can be deployed most effectively. It’s practical problem solving, not theoretical research. Every nest found earlier means a better chance of limiting spread.
Drones form the central pillar of the research because they can bring cameras and sensors close to tree canopy without putting workers at risk. The team is also exploring how artificial intelligence and digital tools can support future control efforts. This isn’t a Danish problem alone. The toxic caterpillar is spreading across much of Europe.
Open Source Battle Plans
What strikes me most about this project is the open approach. All images, videos, and data will be released under an open source license. Municipalities, companies, researchers, and entrepreneurs can freely use the material to develop new solutions, both commercial and non commercial.
Odense Robotics funded the effort with 100,000 kroner. The drone company SkyLevel is contributing pilots, specialized equipment, and experience from advanced drone operations near trees and buildings. SkyLevel already uses drones to control seagull nests, expertise they’re now applying to processionary moths.
Søren Elmer Kristensen, CEO of Odense Robotics, sees this as a model for innovation. “When companies develop solutions based on concrete needs, it strengthens both their competitiveness and their ability to solve societal challenges,” he notes. It’s the kind of public private partnership Denmark does well when it actually commits.
Beyond Odense
Odense mayor Peter Rahbæk Juel frames this as an ongoing challenge. “With the oak processionary moth, we have a new problem that has very likely come to stay,” he says. The combination of knowledge and new technology could help not just Odense but other places in Denmark and Europe.
Living in Denmark, I’ve seen how quickly attitudes shift from “this isn’t our problem” to “we need solutions yesterday.” The processionary moth fits that pattern perfectly. What started as isolated sightings has become a municipal headache requiring coordinated response.
The larvae are only active until mid August. After that, the research team can only analyze what they’ve collected and prepare for next summer. For affected residents and the workers handling extermination daily, that might feel like a long wait. But if thermal imaging and drones can genuinely speed up nest detection, the payoff will be worth it. Denmark is treating this seriously, which given the health risks and rapid spread, seems entirely appropriate.
Sources and References
Ritzau: Kapløb med tiden skal give Danmark nye våben mod “Larven fra Helvede”
The Danish Dream: Toxic caterpillar in Denmark discovered at Horsens daycare center
The Danish Dream: Found in Danish waters toxic Pacific jellyfish
The Danish Dream: Plants in Denmark toxic species triggers warning to Danes
