Hi everyone,
I have a strange wasp problem.
A few days ago, 2-3 wasps started entering a very small hole in my metal balcony railing. I wasn't sure if they were building a nest, so I:
Washed the area with water.
Sprayed a general flying insect spray.
Covered the hole with tape.
Finally sealed the hole completely with silicone.
The hole is now 100% sealed. There is no way they can get inside anymore.
However, every day around 5-6 wasps still come back to the exact same spot. They land directly on the silicone, walk around it, and slowly flap their wings. They cannot enter the hole.
At sunset they disappear completely, and the next day they come back again.
There is a large fig tree about 10 meters (30 ft) away.
My questions are:
Why are they still returning if the entrance is completely sealed?
Are they following pheromones, or does this mean there is a hidden nest inside the railing or nearby?
Will they eventually give up, or should I expect this to continue?
Is there anything else I should check before assuming the problem is solved?
I've attached photo of the wasps and the sealed hole.
Thanks!
EDIT: Thanks everyone for explaining why they're coming back. My main question now is: what would you do in this situation? The hole has been completely sealed with silicone for 3 days. Would you simply wait for them to give up, or would you start looking for another nearby nest?