Smudge Pot: Oil-burning heaters used to prevent or reduce frost damage in orchards and vineyards. Typically consisting of a wide base topped by a chimney, smudge pots may be lit when frost threatens.

Reduction of disease within the vineyard of 40% on average with mildews ... “Interestingly the key benefit with a PIWI due to its existing resistance to mildews is frost protection and yield increase” ...