DMN sprout suppressant gains approval in GB

Inside a potato store

Potato sprout suppressant 1,4SIGHT has gained full approval in Great Britain, providing a welcome addition to the list of products used to maintain tuber dormancy in stores.

Containing 1,4-dimethylnaphthalene, more commonly known as DMN, the product has been awaiting regulatory approval since 2015.

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Its approval holder DormFresh has now plugged all the regulatory data gaps required by the Chemicals Regulation Division (CRD-HSE), and British potato store managers will be able to use the product from the start of the 2022-23 storage period.

The clamour for DMN’s approval has increased since the withdrawal of chlorpropham (CIPC), which provided cost-effective, residual control of sprouting in potato stores for decades.

Essential oils

Since CIPC was banned, only contact-acting products like mint oil, orange oil, and ethylene gas have been available.

The essential oils only offer relatively short-term efficacy and require multiple applications, while ethylene is not suitable for use in all potato markets.

Although DMN is not a like-for-like replacement CIPC, its mode of action does have curative and residual effects.

This means it can control existing in-field or in-store sprouts emerging from tubers and enhance natural dormancy by breaking apical dominance, preventing sprouting in the first place.

Its approval holder DormFresh told potato-farming.com that more detail on the approval will be communicated in the coming days, including the 1,4-SIGHT product label and its statutory conditions of use.

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