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Proposed Acceptability for Continuing Registration: Phase 2 of the Re-evaluation of Chlorpyrifos

March 18, 2003
ISBN: 0-662-33455-8
Cat. No.: H113-18/2003-3E-IN
(PACR2003-03)

To obtain an electronic copy of the document, Proposed Acceptability for Continuing Registration: Phase 2 of the Re-evaluation of Chlorpyrifos, please contact publications@hc-sc.gc.ca.

Should you require further information please contact the Pest Management Information Service.

Summary

The organophosphate active ingredient chlorpyrifos and associated end-use products were proposed for re-evaluation under Section 19 of the Pest Control Products Regulations in June 1999.

Chlorpyrifos has been re-evaluated in two phases based on use patterns. The first phase mainly covered the non- agricultural uses (e.g., indoor and outdoor residential uses). Phase 1 regulatory actions were announced on September 28, 2000. This document describes the outcome of the second phase (agricultural and forestry uses) of the Pest Management Regulatory Agency's (PMRA) re-evaluation of the insecticide chlorpyrifos and its end-use products. It includes a human health risk assessment, an environmental risk assessment and information on the value of chlorpyrifos to pest management in Canada.

As a result of the re-evaluation, the PMRA is proposing that certain measures be implemented to reduce environmental and occupational risks. These measures include discontinuation of chlorpyrifos use on certain crops (corn, filberts, lentils, oats, peppers, sugar beet, and tobacco). It is proposed that use on peaches and nectarines be allowed to continue until 2006. For the uses proposed for continued registration (canola, barley, carrot, flax, potato, wheat, strawberry, radish, Asian radish, celery, cucumber, cole crops, garlic, sunflower seeds, and rutabaga, and peaches and nectarines until 2006), it is proposed that environmental and occupational risks be mitigated by a reduction of the number of applications per season, restriction in aerial applications, buffer zones to protect aquatic ecosystems, implementation of engineering controls and personal protective equipment for workers, and establishment of re-entry intervals for post-application workers.

By way of this Proposed Acceptability for Continuing Registration document, the Agency is soliciting written comments from all interested parties on the decisions and mitigation measures proposed in Phase 2, and is requesting that registrants or other stakeholders identify crops that they intend to support. The PMRA is also interested in receiving comments on the accuracy and utility of use pattern information, particularly with respect to the grouping into key uses, important uses and crops with little or no uses.