When did spiders become so associated with Halloween?

I am an arachnophobe. I don’t even like to see images of the shapes of spiders.

So now I hate Halloween. When I was a kid, it was pumpkins, ghosts, gravestones, goblins, jack o’lanterns, bats, witches, skeletons. Bit spiders were non-existent or a minor part of things. Now, webbing and spiders are everywhere, almost one of the main symbols of the holiday.

When and why did that happen?