The lion kingdom has taken to duct tape on the end of a rod to kill spiders on the ceiling.  The problem is getting the adhesive parallel to the ceiling & keeping the spider from jumping down on the lion.  The ideal solution would be a large  container on the end of a rod which could seal it in.  Then a gas could be injected to kill it.  It's messy to release chemicals inside a container.  

The 2nd best option would be a way to remotely manipulate a large adhesive surface inside a large container.

A large, convex, flexible adhesive surface would probably be the most practical option.