Photograph of Hexachlorobenzene under the microscope

This chlorine-saturated aromatic is the parent compound in the substituted aromatic class of pesticides and was introduced for seed treatment as Perchlorobenzene in 1945. The mechanism of action of this fungicide is probably similar to others in its class, and acts by interference with amine and thiol metabolism, slowing the growth rates and sporulation of fungi. It is usually formulated as a 10 weight percent dust or in combination with other seed protectants. Hexachlorobenzene can act as a selective fungicide and has been found suitable for the control of dwarf bunt of wheat by interfering with bunt spore formation.

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