Pentachloronitrobenzene

Pentachloronitrobenzene, also known as PCNB or Quintozene, is an organochlorine pesticide. It is a white to yellowish crystalline solid with a mild aromatic odor. PCNB was widely used as a fungicide to control a variety of plant diseases on seeds, bulbs, and soil. Its primary applications included protecting crops such as vegetables, fruits, and ornamental plants from fungal pathogens like *Rhizoctonia*, *Sclerotinia*, and *Botrytis*. It was also employed as a seed treatment to prevent damping-off diseases.

The compound is relatively stable and can persist in the environment. Its mode of action involves disrupting fungal respiration and cell division. Due to its persistent nature and potential for bioaccumulation, its use has been restricted or banned in many countries. Concerns regarding its environmental impact and potential health effects have led to a decline in its global usage. Studies have indicated potential toxicity to aquatic organisms and some laboratory animals. Regulatory bodies have evaluated its risks and implemented restrictions to minimize exposure and environmental contamination.