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Label restriction on Maleic Hydrazide products for 2019 & grower Q&A

21 June 2019

There is a new restriction on the use of some products containing Maleic Hydrazide (MH) that means potatoes treated with such products cannot be fed to livestock in the UK. This follows and Amendment Notice issued by CRD last November.

Maleic Hydrazide is the active substance in growth regulating products such as Itcan SL270, Crown MH, Fazor and Source II used for the control of volunteers and to suppress sprouting during storage. AHDB has recently completed a review of MH as a potato sprout suppressant. The results can be found here.

Growers should contact their supply chain customer to find out their position on MH-treated potatoes. It is anticipated that very few, if any, will accept crop treated with ‘new label’ (label with the mention “do not feed treated crop to livestock”) MH products as most businesses are not able to segregate waste.

‘Old label’ products, which are solely those purchased and stored on farm before 30 April 2019, do not carry the label restriction. But it is still important to check with your customer to see if they will accept potatoes treated with these products.

The owner of the potato crop has the responsibility to ensure that potatoes that have been treated with ‘new label’ MH products do not enter the livestock feed supply chain. This means you must inform anyone who buys potatoes from you if they have been treated with ‘new label’ MH products. The owner of the potatoes also has the responsibility to avoid on farm waste and out grades being fed to livestock.

If you are growing potatoes for the bag or free-buy market, you should be aware that, even if it is not possible to speak to your customer now, you may find that there is less of a market for potatoes treated with ‘new label’ MH products as options for disposal of waste will be limited.

Popular products containing MH available in the UK:

  • Gemini Itcan SL270

    • Both ‘old’ and ‘new label’ products share same MAPP number: 17957
    • Read the label
  • Certis Crown MH
    • Both ‘old’ and ‘new label’ products share same MAPP number: 18018
    • Read the label
  • UPL (Arysta) Fazor
    • ‘Old label’ MAPP numbers: 13617
    • ‘New label’ MAPP number: 19074
    • Read the label
  • Drexel Source II
    • Both ‘old’ and ‘new label’ products share same MAPP number: 17858
    • Read the label

Other formulations are available. If your product is not listed you can check the HSE’s Pesticides Register at

Can waste potatoes treated with ‘new label’ MH products go in AD plants?

At this point we do not know, though the approval holders of the products are seeking clarification on this.

Will our customer be able to import potatoes that have been treated with MH products from countries where the restriction does not apply?

Yes they will, as they would not be going against ‘on-label’ stipulations.

Do these restrictions apply to the use of MH products on parsnips, carrots and onions?

The re-approval on MH did not cover use on carrots and parsnips, so MH products should not be used on those crops. As onions do not enter the livestock feed supply chain, the restriction is not relevant. If you have a stock of both ‘old’ and ‘new’ label products, you should be able to use ‘old label’ on your potatoes, and ‘new’ on your onions – but you should check with your customer first.

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