The battle against the yellow-legged hornet, a tiny yet formidable invader, is showing promising results. Six months ago, the discovery of these hornets on Auckland's North Shore sparked fear among the bee industry and the public, with the potential to devastate a $59 billion primary industry and even pose a threat to human lives. The initial concern was palpable, with the number of queens discovered rising and the infestation spreading rapidly. However, a massive eradication effort, led by the Ministry for Primary Industries (MPI) with $12 million in government funding, has yielded encouraging signs. The number of queens discovered has stabilized at 77, associated with about 63 nests, and despite ongoing searches, no new queens have been found for some weeks.
Phil Lester, a professor of entomology and ecology at Victoria University, expresses cautious optimism. He acknowledges the scary numbers initially discovered, emphasizing the potential for exponential growth if even a single nest remained undetected. The public's engagement, with residents actively participating in trap-setting and reporting, has been instrumental in the effort. The hornets' movement has been restricted to within six kilometers of the original ground zero, with one being found in Takapuna.
Lester attributes the success to a combination of factors, including the fear that gripped the community, which effectively conveyed the message of the threat. The involvement of beekeepers and Apiculture New Zealand played a crucial role in pressuring MPI and the minister to take action. The eradication program brought in experts from the UK, who trained MPI workers and introduced radio tracking technology and AI cameras, enhancing the ability to detect and combat the hornets.
However, Lester emphasizes the need for continued vigilance. The possibility of hidden nests remains, and the risk of re-infestation looms. The hornets' reproductive cycle, which shifts towards producing new queens in autumn, adds another layer of complexity. The genetic tracing of the hornets back to a single source suggests a single nest, but the exact entry point and the initial source of the infestation remain unknown.
Despite the challenges, the eradication effort has provided valuable lessons and skills. Lester highlights the improved ability to find and control these invasive species, with MPI developing a standard operating procedure for future infestations. The public's support, driven by the fear of stinging wasps, has been instrumental in the success of the campaign. As the battle against the yellow-legged hornet continues, the focus shifts to preventing future invasions, ensuring the resilience of New Zealand's bee industry and the safety of its citizens.
