A groundbreaking invention, born in New Zealand, is now taking on a formidable foe - the deadly yellow-legged hornet. This innovative protein insecticide bait, known as Vespex, has been a game-changer for wasp control and is now being trialed to tackle a new invasive species. But here's where it gets controversial... will it be effective against these hornets?
Developed by a Nelson-based entomologist, Richard Toft, Vespex took over two decades to perfect. Toft's dedication and expertise earned him international recognition with a prestigious Conservation Innovation Award from the WWF. This bait, designed to be ignored by honey bees, has been a valuable tool for controlling common and German wasps, but its effectiveness against hornets is still being determined.
The Battle Against Invaders
As the breeding cycle progresses, wasps and hornets shift their diet to protein-based sources, making this a critical window for intervention. Scott Sinclair from Biosecurity NZ explains that the Vespex bait is rolled into small balls by wasps or hornets and taken back to the nest, where it's distributed to feed the growing colony. This process leads to the ingestion of the fipronol-based bait by many nest inhabitants, resulting in a significant reduction in the nest population.
However, Biosecurity NZ is cautious about the bait's impact on hornets. While some studies in France suggest hornets may find it attractive, the timing of deployment is crucial. Sinclair highlights that protein-based baits are more effective against hornets later in the season.
Timing is Everything
The decision to use Vespex at this stage of the breeding cycle is strategic. Earlier in the season, yellow-legged hornets prefer carbohydrate/sugar-based foods, but as their life cycle progresses, they shift to protein-based sources. Additionally, live hornets are essential for tracking and destroying nests, so using Vespex too early could weaken nests, making them harder to detect.
The Hornet Invasion
Ground operations are actively searching for and destroying hornet nests on Auckland's North Shore. So far, 51 queen hornets and 61 nests have been confirmed.
Vespex, now manufactured and sold by Nelson's Merchento (with Toft as director), is a powerful tool in the fight against invasive species. But will it be enough to eradicate the hornet threat?
And this is the part most people miss... the impact of invasive species on native ecosystems can be devastating. So, while we await the outcome of this trial, let's discuss: What are your thoughts on the use of insecticides like Vespex? Are there any potential environmental concerns we should consider? Feel free to share your insights and opinions in the comments below!
