A spot of knowledge on wasps. Love ‘em please, don’t swat them!🙏🏼
Did you know that there are approximately 9,000 species of wasp here in the UK? These include the parasitic wasps, some of which are so diminutive they are like pin heads. Of the 250 larger wasps which have have a stinger, the majority are solitary and cause no upset to humans.
When we talk about wasps, we’re almost certainly referring to the our nation’s nemesis, the Common wasp (Vespula vulgaris). To understand why these wasps become really annoying this time of year, you first need to understand their life cycle.
Common wasps live socially like bees and are pollinators like bees but, unlike honey bees, they haven’t evolved a way of storing food to allow the colony to survive the winter. In fact the only survivors are the young, fertilised queens who hibernate over winter. They emerge in the spring to build little walnut sized nests where they they lay around 20 eggs.
The queen feeds the resulting larvae until around May, when they mature and become workers. Then she focuses on more egg-laying and the workers get on with feeding them, enlarging the nest as they go along. By this time of year the nest has grown to around 40cm in diameter, often larger, and that nest can contains up to 10,000 wasps!
Then, in late August and September, a dramatic change takes place. The queen quits her egg laying (save a few that will go on to be future queens and males to fertilise them) and no longer releases the pheromone that causes the workers to work.
Basically these workers are made redundant and are left jobless and disorientated. And the problem for us is that, although adult wasps are insect predators, that meat is to feed the larvae not themselves. In their adult state wasps are not able to digest solid food and need sugary liquid to survive. Now, with fewer no larvae to feed, they become uncontrollably and insatiably hungry.
Wasps love easy food such as over ripe fruit and your fizzy drinks. Towards the end of their brief lives, their hunger drives them to search for easy sugar at exactly the time when we are more likely to be using our gardens and outdoor spaces for eating sweet things. The timing couldn’t be better for them or worse for us.
So why are those who panic and try to swat them away more likely to be stung than those who remain calm? Well the problem is that these redundant workers have their own pheromone, which helps protect the nest from attack earlier in the year, and that’s essentially a chemical rallying cry to other workers that the nest is under attack.
So when you swat that annoying wasp and it feels under attack, that rallying cry will go out. Suddenly it all kicks off, and loads more wasps will start arriving in aggressive ‘red-mist’ mode, fired up and ready to defend their nest.
What’s the point of wasps? Without them it’s unlikely human life would survive because, in the absence of their role as insect predators, our planet would be overrun by catastrophic numbers of much more damaging insects such as aphids, ants and caterpillars that would utterly decimate the crops that we depend upon.
Original post: Angela Magee