Britain is bracing for a significant rise in Asian hornet populations as the country faces one of its hottest years on record, raising concerns among experts about the impact of the invasive species on native ecosystems and agriculture. The Met Office forecasted continued warm conditions following an unusually hot spring, with 2026 projected to rank among the warmest years in recent history.

Asian hornets, first detected in the UK in 2016, have established a growing presence, particularly in the south and southeast of England. The insects prey heavily on honeybees, which constitute about a third of their diet, along with other pollinators such as moths, flies, butterflies, and various bee species. Honeybees are critical for pollination and crop production, heightening worries about the hornets' expanding numbers.

Since the initial nest was found and destroyed around a decade ago, the number of nests has surged sharply—from 24 recorded in 2024 to 161 nests identified last year. Each nest can produce dozens of queens, substantially increasing the potential for population growth if any nests go undetected. Luke Newnes, an expert on Asian hornets, emphasized that the warmer weather is accelerating the emergence of queens and driving the rapid expansion of the species’ range. "What makes 2026 particularly concerning is the acceleration we’re now seeing in both sightings and geographical spread," Newnes stated. He noted that sightings, once largely confined to coastal areas, are now being reported much further inland, suggesting a shift from trying to eradicate the species toward managing its long-term presence.

The Asian hornet originated in southeast Asia but has spread northward into Europe due to rising temperatures. In the UK, the insects often arrive hidden in cargo such as fruit transported across the English Channel. Notably, a nest was discovered as far north as Runcorn, Cheshire, in September last year, marking an expansion of their known range.

Officials and experts are urging the public to remain vigilant in reporting sightings but caution against attempting to remove or disturb nests. Asian hornets can become aggressive if provoked, and intervention should be left to professionals. The National Bee Unit encourages the use of a dedicated app that allows citizens to report sightings, which are then verified and investigated.

Niall Gallagher, technical manager at the British Pest Control Association, underscored the importance of controlling the hornet’s spread to protect native wildlife and agricultural productivity. Dr. Peter Kennedy, a conservationist at the University of Exeter, echoed this, stating that the only effective method to limit expansion is the early detection and destruction of nests.

The Met Office highlighted recent extreme warmth, with record-breaking May night temperatures in Cornwall reaching lows no cooler than 21.4°C. Meteorologist Alex Burkill described the sustained heat as both "extraordinary" and "quite worrying," given its potential ecological consequences.