For several years now, the Asian hornet (Vespa velutina) has been progressively colonizing our territory, raising concern and curiosity in relation to the native species, the European hornet (Vespa crabro). Although these two hymenopterans belong to the same family, their morphology, behavior, and impacts differ significantly. This article offers a detailed comparison, illustrating the major similarities and differences to better understand these winged predators.
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1. Origin and geographical distribution
1.1 The European hornet (Vespa crabro)
The European hornet is an indigenous insect of Eurasia, present for millennia in forests, meadows, and sometimes urban areas. It is found from northern Spain to Siberia, with a preference for temperate regions. In our countryside, it plays a role as a regulator of caterpillar, ladybug, and fly populations.
1.2 The Asian hornet (Vespa velutina)
Originating from Southeast Asia, the Asian hornet was accidentally introduced to France in 2004, probably via flower pots imported from China. Since then, it has spread across most of France and is gradually reaching neighboring countries. It is now observed as far as Scandinavia and Central Europe, where its nest is often located high up in trees or near dwellings.
2. Morphology and identification
| Criterion | European hornet | Asian hornet |
|---|---|---|
| Size | 20–30 mm (queen up to 35 mm) | 17–24 mm (queen 25–30 mm) |
| Color | Reddish yellow and black | Dark (brown-black thorax) + single yellow ring |
| Wings | Transparent, light brown tint | Slightly smoked, darker shades |
| Markings | Yellow/black striped abdominal segment | Black abdomen with a single yellow-orange segment |
3. Feeding behaviors and ecological impact
3.1 European hornet: versatile predator
In Vespa crabro, the diet is varied: crawling or flying insects (caterpillars, flies), sometimes ripe fruits. It captures its prey in flight, chews them on the ground, and feeds the larvae. Adults mostly consume nectar, sap, or fermented juices. At low densities, it contributes to ecosystem balance without disrupting bee populations.
3.2 Asian hornet: specialized bee hunter
The remarkable point with Vespa velutina is its adaptation to trapping honeybees. Asian workers form observation posts in front of hives and intercept bees as soon as they return from foraging. This intense pressure can lead to the collapse of entire colonies, weakening beekeeping and local pollination.
4. Nest structure and annual cycle
- European hornet: nests built in cavities (trunks, attics). Oval structure, thick paper, 20–40 cm in diameter.
- Asian hornet: spherical nests, often on the outskirts of urban areas, up to 60 cm in diameter. Develops upwards (10–15 m) then descends gradually as the season progresses.
“I discovered an Asian hornet nest in the walnut tree in the garden: impressive and terrifying!” – testimony from a Breton beekeeper.
5. Risks to humans and stinging strategies
Both species have a sting and can sting multiple times. The severity depends on individual sensitivity and the number of stings. In general:
- European hornet: less aggressive, mainly attacks when one gets too close to the nest.
- Asian hornet: curiosity and food stress can make it more nervous; stings are more frequent when approaching honey enthusiasts or hives.
6. Impact on beekeeping and biodiversity
Amateur or professional beekeepers face two major challenges: loss of hives and increased costs for protective devices (entrance grids, selective traps). The Asian hornet heavily impacts honey production. Furthermore, predation pressure alters the pollinator balance, threatening wild blooms and fruit crops.
7. Control and prevention methods
7.1 Selective traps
Pheromone or sweet bait traps can capture workers without harming other insects. Effectiveness depends on the timing of capture and the correct dosage of attractants.
7.2 Nest destruction
Professional intervention is mandatory for nests at height. Techniques: insecticide spraying in autumn, specialized vacuuming, then mechanical destruction of the nest.
7.3 Citizen monitoring
The monitoring network relies on reports via applications or regional platforms. A rapid response limits dissemination and nest abandonment.
8. Comparative table of challenges
| Challenge | European hornet | Asian hornet |
|---|---|---|
| Pressure on hives | Moderate | Very high |
| Aggressiveness | Low to moderate | Moderate to high |
| Health risk | Local allergies | Allergies + systemic reactions |
| Effect on biodiversity | Balancing | Disruptive |
| Control | Local, manual | Coordinated, technical |
9. Key facts and outlook
- First detection of the Asian hornet in France: 2004.
- Number of nests destroyed each year: over 30,000 in 2022.
- Ongoing studies on more targeted pheromone traps.
10. FAQ
- Is the Asian hornet more dangerous than the European one?
- It is not intrinsically more toxic, but its predation behavior on hives and nervousness make it more likely to sting.
- How to recognize an Asian hornet nest?
- It is a large ball about 50 cm in diameter, suspended high in a tree, with a often clearly visible side entrance.
- Can we coexist with the European hornet?
- Yes, provided a safe distance is maintained and the nest is not disturbed. It contributes to the natural control of harmful insects.
Ultimately, while the invasion of the Asian hornet poses a major challenge for our beekeepers and biodiversity, the European hornet remains an ally in pest control. Knowing their differences allows for better targeting of control and awareness strategies.
