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Canada - Final Regulatory Action
Dinoseb and its salts and esters CAS number:
88-85-7 (*)
Date circular:

Chemical name: Phenol, 2-(1-methylpropyl)-4,6-dinitro-

Final regulatory action has been taken for the category: Pesticide

Final regulatory action: The chemical is Banned

Use or uses prohibited by the final regulatory action:

All pest control uses are prohibited.

Pesticide use or uses that remain allowed:


The final regulatory action was based on a risk or hazard evaluation: Yes

Summary of the final regulatory action:

There were successive stages in the process of restricting the use of dinoseb in Canada with the view to reducing risks posed by the product. The registration of all non-essential uses was suspended by Agriculture Canada in 1990 when health concerns about dinoseb were raised, and the herbicide was designated as restricted class for the few remaining essential uses allowed. In 1994, the use of dinoseb on raspberries in British Columbia was deemed not to be an essential use, and that temporary registration ended, leaving only one restricted class product registered with very limited uses, ie., specific pests on peas and beans in British Columbia, Prince Edward Island, and Nova Scotia. These actions were taken to keep the risks associated with the use of the product within acceptable limits.
Use of dinoseb for the control of black nightshade in peas in British Columbia was allowed until December 31, 2001. Dinoseb is no longer registered for use in Canada.

The reasons for the final regulatory action were relevant to: Human health

Summary of known hazards and risks to human health:

Review of relevant data by Health and Welfare Canada (now Health Canada) revealed that dinoseb has teratogenic effects, male reproductive effects, and causes cataract formation in test animals. The calculated margin-of-safety indicates appreciable risk to applicators.

Expected effect of the final regulatory action in relation to human health:

Elimination of occupational exposure to dinoseb.

Date of entry into force of the final regulatory action: 01/01/2002