It’s spider season, and for some, it’s a daunting experience to get rid of spiders when they find their way inside your home. Although you can take precautions to stop them from entering by spraying patios and pathways with vinegar, or spreading pantry items, such as cinnamon, around entry points, some will inevitably find their way indoors.
However, although I’m not afraid of getting rid of spiders, and will happily move them back outside — as long as they are within a certain size — I want to know why I sometimes spot a phantom cobweb, but there’s no spider at home.
To investigate this spider mystery, I called on the expert help of Sophie Thorogood, Technical Training Manager at Pest-Stop.
Where have all the spiders gone?
It appears that if you notice an empty spider web, they’ve quite possibly crept off to find a partner.
“Male spiders often leave their webs in autumn to search for females to mate with,” says Thorogood. “They follow pheromone cues to locate and mate near their webs.”
But there is not always a happy ending. “Some species, such as the Giant House Spider, will not return because the male typically joins the female on her web and dies during winter,” explains Thorogood.
This is one reason why you could be left with an empty cobweb gathering dust. However, there’s another explanation why the web is empty. “Males may die shortly after mating — sometimes becoming food for the female, or because they leave part of their body inside the female to prevent other males from mating with her, which ultimately causes their death.”
It certainly sounds like a gruesome way to procreate!
They could be lurking nearby
Apart from abandoning their webs to find a mate, and never returning because the females devour them, spiders can also leave their webs to wait for prey to become entrapped. But when this happens, Thorogood says, they will never be far away.
“Most spiders stay close to their webs so they can quickly react when prey is caught," she says. "Some sit right in the center — something we often see in gardens — while others rest at the edge of their web and respond when they feel vibrations,”
Certain species may also hide in nearby cracks or holes, while still remaining within reach of their webs.
Is it a spider web?
It’s quite possible that what you imagine to be a spider web is cast by another insect, although its appearance will be slightly different.
“Some insects, such as moths, do produce silk, which can resemble spider webbing when seen on bushes or vegetation. However, this silk isn’t woven into intricate, purposeful structures designed to trap prey,” explains Thorogood.
“True webs, spun between two points and built for catching insects, are made only by spiders,” she concludes.
Cobwebs are inactive webs
Once a spider web has been abandoned, it will start to gather dust and dirt, which is what we’ve come to recognize as a cobweb. While an active spider web is clean and translucent, and used by the insects to trap prey, a cobweb indicates that the spider has moved on, and it’s time to clean the cobweb away.
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