We have filled Europe with traps to combat the terrible Asian wasp. It was a bad idea

That non-endemic species reach new territories It’s a colossal problem. It is estimated that more than half of contemporary extinctions They are the fault of invaders and there are examples of kicks (reaching the Arctic due to climate change). He coypu or the blue crab They are two of those invasive animals, but if we share something in Europe it is the “fear” of Asian wasps: a ‘bug’ that we have been fighting for 20 years and against which we are losing miserably.

And the big problem is that we are killing flies with cannon shots.

vespa velutina. About three centimeters long, this wasp came to Europe at the beginning of the century. Supposedly, he did so aboard a cargo ship from China, landing on the French coast and, since then, colonizing other territories. In 2010 the species spread to Spain, entering from the Basque Country, colonizing the Cantabrian coast and arriving in Galiciabut it has also expanded to Portugal, Germany and even the United Kingdom.

It is already well established and, although it is true that it is not more aggressive than “our” wasp, when it gets angry and stings it can cause serious allergic reactions, causing occasional deaths. The worst thing is that it continues to expand at a rate of about 80 kilometers of territory gained each year.

Invaders. It’s no longer that they can bother us, but rather that, as an invasive species, they do what they do best: destroy the native ones. And not with other wasps, but with bees. The Asian wasp is a predator of other insects, but has a predilection for honey bees. It attacks their hives indiscriminately, causing enormous damage to beekeeping.

At a time when awareness about importance of bees in naturebeyond for him human consumption of honeythere are those who take matters into their own hands and have started setting traps.

It moves fast

Flies with cannon shots. There are several types. On the one hand, the most homemade: the typical upside-down bottle that we fill with mixtures attractive to wasps (juices, wines, fruits and sugar), creating a sticky paste in which the wasp becomes trapped. There are others that are more sophisticated and selective, with large holes for wasps to enter, but with release mechanisms for smaller animals and pheromones that attract insects.

The problem is that they are remedies that can do more harm than anything else because, although commercial traps have release mechanisms for accidentally captured insects, you have to be careful and, basically, it is killing flies with cannon fire.

Those who do not have to fall fall. And the main criticism is precisely that: the traps do not discriminate and damage is created to biodiversity because many insects that are not the Asian wasp are killed. Among them are moths, beetles, flies, bees and an ally that fights against the Asian invader: the European hornet.

In a recent investigation published Pest Management Science has analyzed how in Galician vineyards, traps against Vespa velutina have turned out to be ineffective in controlling the damage that the insect does to grapes, but although Asian wasps are trapped, other species that have an important role in pollination are also captured.

Solutions? The request of the researchers is that the Galician administration, promoter of this massive trapping, takes a step back because what is produced is a false idea of ​​effectiveness due to general captures, but without implying that the objective, which is to stop the Asian wasp, is met. What do they propose? That this elimination technique be reconsidered and look at the scientific evidence, since “environmental problems are complex and can rarely be solved with quick and easy solutions.”

It is not a solution as such to the damage that these invasive wasps can cause, but it is to put an end to the indiscriminate killing of other insects that do a job in our ecosystem. What is evident is that, as we mentioned a few paragraphs ago, for a kind of outsider to arrive and establish itself so quickly in a territory is something devastating. And the Asian wasp is a perfect example.

Images | Clame Reporter, Didier Descouens

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