Dogs Outperform Experts in Detecting Invasive Spotted Lanternfly Egg Masses

Canine Detection in Real-World Conditions

At a Maryland vineyard, Debi Persing guided her Boston terrier, Xephyr, slowly down a row of grapevines. Vineyard workers and scientists had already identified several invasive spotted lanternfly egg masses hidden among the vines. They believed they had found them all. Then Xephyr stopped at a vine they had marked clear. The little dog sat and pawed at the plant insistently. When researchers checked more closely, they found the egg masses Xephyr had detected but trained experts had missed. "She was adamant," Persing said. "She's a machine at finding odor."

Xephyr's search was part of a new study from Virginia Tech's College of Agriculture and Life Sciences that pitted ordinary pets, trained by their owners, against experienced human searchers in a hunt for spotted lanternfly egg masses. It was the first test of community dog-handler teams in real-world conditions, where egg masses occur naturally, scents compete and target locations are unknown. The dogs outperformed the people by more than 2-to-1 in densely vegetated areas. The study has been published in PeerJ.

Implications for Early Detection

"What this means is that we can turn to everyday dogs and their owners and train them as a flexible early detection force," said Erica Feuerbacher, the study's lead researcher and a professor in the School of Animal Sciences. "In places where the spotted lanternfly hasn't reached yet, teams could train in advance and be ready to detect it before it becomes a major infestation."

The spotted lanternfly has spread to 19 states, threatening vineyards, orchards and forests. Finding the insect's eggs early is one of the best ways to slow its spread, but they are difficult to spot and professional detection dog teams are in short supply. To test whether dogs and their owners could help fill that gap, Feuerbacher and co-author Sally Dickinson partnered with Virginia Tech grape disease experts to conduct the study.

How the Study Worked

The research team recruited pet dogs and their owners from the community, providing them with training to detect the scent of spotted lanternfly egg masses. The dogs were trained using positive reinforcement methods, and their owners learned how to handle them during searches. The study took place in a real vineyard where egg masses were naturally present, as well as in other vegetated areas. Human searchers, including experienced vineyard workers and scientists, conducted parallel searches to compare effectiveness.

Results showed that the dog-handler teams found significantly more egg masses than human-only searchers, especially in areas with dense vegetation where visual detection is challenging. The dogs' ability to detect scent allowed them to locate egg masses that were hidden from human view.

Advantages of Community-Based Detection

Using everyday dogs and their owners offers several advantages. It creates a scalable, low-cost early detection network that can be deployed rapidly in new areas. Professional detection dog teams are expensive and limited in number, but community teams can be trained relatively quickly and cover more ground. "This approach could be a game-changer for invasive species management," Feuerbacher said. "We can mobilize a large number of volunteers who are passionate about their dogs and about protecting their local environment."

The study also highlights the remarkable olfactory abilities of dogs, even those not specifically bred for detection work. Xephyr, a Boston terrier, is a family pet who learned to find lanternfly eggs through training with her owner. "She's a machine at finding odor," Persing said, and the data backs that up.

Next Steps for Research

The Virginia Tech team plans to expand the study to other regions and other invasive species. They are also developing standardized training protocols that can be used by dog owners anywhere. The goal is to create a citizen science network that can help protect agriculture and natural resources from invasive pests.

"This is just the beginning," Feuerbacher said. "We've shown that ordinary dogs can do extraordinary things when it comes to conservation. With proper training and support, they can become a vital part of our early detection toolkit."

This article is based on reporting by Phys.org. Read the original article.