Hydrogen cyanamide reassessment


We are reassessing the use of hydrogen cyanamide, a restricted spray ingredient used in commercial orchards. This reassessment is open for public submission.

Submissions close on Monday 20 December 2021 at 5.00 pm.

Hydrogen cyanamide has been used in Aotearoa New Zealand since 1988. It is used mainly in kiwifruit orchards to promote bud growth. It is also used in some apple, cherry, apricot, and kiwiberry crops, but to a lesser extent.

There are six hydrogen cyanamide products approved for use. They are restricted to commercial use, and can only be used by trained professionals.

Why we are reassessing hydrogen cyanamide

We have assessed the risks to people and the environment, and economic benefits of hydrogen cyanamide use in New Zealand. Our assessment was based on risk analyses, economic assessments, information on alternative bud-break agents, and general comments we received from industry groups, iwi, and individuals.

Other significant information included a European Food Safety Authority review, and assessments published by regulators in the United States and Europe.

Human health risks

Hydrogen cyanamide is toxic to the reproductive system and thyroid if people are exposed to it over time. It is a suspected carcinogen, and is corrosive to skin and eyes. The risks to operators are of concern.

Environmental health risks

There are risks to the aquatic environment, non-target plants, pollinators, non-target arthropods, and birds. Risks can be mitigated by using buffer zones, restrictions on application rate and timing, and prohibiting use when bees are present.

Impact on Māori culture and social wellbeing

The continued use of hydrogen cyanamide is likely to enhance Māori economic and social development in terms of prosperity, livelihoods, and lifestyles. But it is likely to adversely affect the relationship of Māori and their culture and traditions with their environment and taonga, including culturally significant species, resources, and places, and the customary values, practices and uses associated with these taonga.

In mid-2021 we held hui in kiwifruit-growing regions to gather information for our Māori impact assessment report. In advance of the hui, we provided two documents summarising the key issues identified in our risks and benefits assessments.

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~sEPA New Zealand, 29 October 2021