Invasion of Brown Marmorated Stink Bugs Across Occitanie and France
Brown marmorated stink bugs, known scientifically as Halyomorpha halys, have established a permanent presence across Occitanie, with residents reporting dozens of the insects invading homes as autumn temperatures drop. Originally native to Asia and first detected in France in 2012, the invasive species has found an environment with minimal natural predators, according to Jean-Claude Streito, an entomologist and research engineer at the French National Institute for Research for Agriculture, Food and Environment (INRAE) in Montpellier, midilibre.fr reported. This season has brought particularly heavy reporting of the insects across multiple regions, including the Essonne, Alsace, and the Aude.
Why Stink Bugs Invade Homes in Autumn
The influx of insects into residential properties is driven by seasonal survival instincts rather than a search for food. As daylight shortens in the autumn months, the bugs seek dry, warm shelters to hibernate through the winter. During this period of dormancy, they do not feed, according to Jean-Claude Streito. The insects emerge again in the spring to lay eggs. Homeowners report the pests squeezing into window grooves, pushing past mosquito nets, and settling on walls and ceilings in large clusters.
In the Pyrénées-Orientales, residents Pascal and Marguerite detailed finding up to 20 bugs on a single curtain within a 24-hour period. Similar accounts come from Montpellier, where another invasive species—the western conifer seed bug, Leptoglossus occidentalis—frequently adds to the confusion by entering homes in high numbers. While the western conifer seed bug is slender with leaf-shaped hind legs and feeds primarily on conifers without causing household damage, the brown marmorated stink bug poses a direct threat to agriculture.
Agricultural Damage and Garden Destruction
Beyond household nuisances, the brown marmorated stink bug inflicts severe damage on crops and home gardens. Jean-Claude Streito noted significant agricultural losses affecting apples, pears, kiwis, and hazelnuts, with reports concentrated primarily in the Rhône Valley and Aquitaine. In private gardens, the insects target vegetables such as tomatoes, piercing the fruit to feed and rendering harvests unmarketable. Residents attempting to clear gardens often resort to spraying water to force the pests away.
Researchers indicate that eradication is no longer feasible given how deeply established the populations are. The INRAE is currently collaborating with an Asian parasitoid wasp species, commonly known as the samurai wasp, to target the stink bug’s eggs. However, Jean-Claude Streito cautioned that this biological control method will take several years to achieve measurable effectiveness.
Frequently Asked Questions About Invasive Stink Bugs
Are brown marmorated stink bugs dangerous to humans or pets?
No, these insects do not bite humans or pets, and they do not transmit diseases. Their primary impact is the nuisance of their presence and the damage they inflict on fruit crops and home gardens.
What is the best way to remove stink bugs from a house?
Experts recommend gently gathering low numbers of the insects and placing them back outside. If an infestation is heavy, using a vacuum cleaner is advised because it prevents the bugs from releasing their defensive odor.
Why should you avoid crushing the bugs?
Crushing a brown marmorated stink bug triggers the release of a pungent defensive fluid that produces a strong, unpleasant odor. Using a vacuum or gently sweeping them into a container avoids this issue.
Now, she is there and we won’t manage to get rid of her,
Jean-Claude Streito said.