Don’t listen to him, he’s an infested sockpuppet for the fungus. Burn the marloss along with the rest. The lab will be fine.
I’m partial to gasoline and a flamethrower, or 40mm incendiary deployed by vehicle, but honestly you really just need matches or a lighter, the fungus is pretty flammable. Light 4 adjacent tiles and it will turn into a huge firestorm in no time.
Also, if you are going to be hacking robots, you might want to use this mod, by @Shard , it lets you turn robots off so you can store them. I’ve got about 80 Wraitheon bots I hacked (very carefully, while using the artificial night CBM or cowering inside my vehicle) sitting in a closet.