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Label restrictions on Maleic Hydrazide products lifted

Wednesday, 24 July 2019

The restriction on the use of products containing Maleic Hydrazide (MH) has been removed following a review by the Chemicals Regulation Division (CRD) of the HSE.

The now-lifted restrictions followed an amendment to labels in November and meant that potatoes and other crops treated with such products could not be fed to livestock in the UK.

The decision will be welcome news to growers and was made after additional data supplied by an industry stewardship group.

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.

Stewardship group member and Head of Crop Storage Research at AHDB, Adrian Cunnington said:

“MH is an important active for volunteer control and, particularly in the current environment, for sprout control as part of an integrated programme.

“We are pleased that the industry has been able to work with CRD, via stewardship, to reach this important and sensible decision.

“If growers have any further questions they should contact our storage advice line on 0800 02 82 111”

Popular products containing MH available in the UK:

  • Gemini Itcan SL270 MAPP number: 17957
  • Certis Crown MH MAPP number: 18018
  • UPL (Arysta) Fazor
    • ‘Old label’ MAPP numbers: 13617
    • ‘New label’ MAPP number: 19074
  • Drexel Source II MAPP number: 17858

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

Effective collaboration

Mike Storey, Technical Directorate at the AHDB, said: “The CRD has concluded that there are no safety concerns for consumers, therefore there is no benefit in imposing the livestock feeding restriction on products containing maleic hydrazide.

“As well as being an extremely welcomed decision, this outcome demonstrates the impact of effective collaboration between authorisation holders, who worked together with industry to devise a robust stewardship scheme, and to provide the data required.

“Given the timeliness of this amendment, and that maleic hydrazide-containing products are being used in fields as we speak, this is excellent news.”

Since the announcement of the restriction earlier this year, stakeholders were active in their engagement as a collective industry, actions which contributed considerably to its removal.

Mark Taylor of the Fresh Potatoes Suppliers Association (FPSA) said: “Since the announcement of the non-renewal of chlorpropham (CIPC), having a restriction on the use of maleic hydrazide-treated crops had an even greater impact for growers and packers.

“By working together, we have achieved an extremely positive outcome, for which many will breathe a sigh of relief.”

Grower resources:

AHDB review of Maleic Hydrazide as a sprout suppressant Storage and sprout suppression support Sprout suppression page on storage hub

Still need help? Call the storage advice line on 0800 02 82 111

Full list of products affected by ammendment

Product Name

MAPP Number

Authorisation Holder

Amendment Number


Cleancrop Malahide



Drexel Chemical Company

3054 of 2019

Crown MH



Kreglinger Europe NV


3055 of 2019





Arysta LifeScience Great Britain Ltd

3056 of 2019





Arysta LifeScience Great Britain Ltd

3057 of 2019





Arysta LifeScience Great Britain Ltd

3058 of 2019





Arysta LifeScience Great Britain Ltd

3059 of 2019





Arysta LifeScience Benelux SPRL

3060 of 2019





Arysta LifeScience Benelux SPRL

3061 of 2019


Himalaya XL



Arysta LifeScience Great Britain Ltd

3062 of 2019

Itcan SL 270


Kreglinger Europe NV

3063 of 2019

Magna SL



Kreglinger Europe NV


3064 of 2019

Source II


Drexel Chemical Company

3065 of 2019