smudge pot

noun4

1. •
   An oil-burning device used to prevent frost on fruit trees.
2. •
   A pot of tar and oil burned to produce thick noxious smoke to discourage pests.
3. •
   A set of kerosene flares with round bottoms and wicks in a protected cage, once used to mark highway construction sites and as utility flares.
4. •
   A bowl used to hold herbs that are to be burnt and to catch the resulting ashes.