Dichlone (trade names Phygon and Quintar) is a fungicide and algicide of the quinone class.

It is a general use fungicide applied to fruits, vegetables, field crops, ornamentals, and residential and commercial outdoor areas.

[1] It is also used to control blue algae.

[2] Dichlone is not persistent in soil and has moderate mammalian toxicity.

[2] Dichlone can be manufactured by the chlorination and oxidation of naphthalene.