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Storage Bulletin - August 2016

Publication Date: 
5 August 2016

Storage Bulletin - August 2016

SPot West Open Day

The recent SPot West Open Day was held at James and Sam Daw’s farm at Thorpe Constantine, Staffordshire on 19 July. It was an opportunity to highlight how even the most difficult buildings can be converted into successful storage with some thought and attention to detail, a message SBCSR has been reinforcing through its Storage 2020 campaign to improve the state of GB storage.

The Daws have worked closely with Mike Sharp at Welvent to bring a converted cattle shed at the farm up to standard and this has been reflected in successful delivery of crops in June and July to the processing market over the last few years. The last of this year’s crop of 2300 tonnes of Russet Burbank finally left the store (below) just 2 days before the visitors arrived.

Modifications have included adding roof space heating, upgraded insulation/ sealing, second-hand refrigeration, modified ductwork and localised heating to ensure control is maintained and risks are minimised for long term storage.

Call the Sutton Bridge team on 0800 02 82 111 for advice on how to upgrade your storage


Make sure you are ready for the future with CIPC

CIPC labels and Stewardship guidance updated for 2016/17
Changes for the forthcoming year to product labels for chlorpropham (CIPC) have recently come into force and, on 1 August, the Potato Industry CIPC Stewardship Group released its updated guidance for the forthcoming season.

CIPC is an essential for the control sprouting and is applied to almost 2 million tonnes of potatoes stored each year across the industry in Great Britain.

In line with the ‘Step Down’ process working towards a new pan-European rate for 2017, there are new, lower application rates for CIPC use in the coming season which have now been approved. These were requested by the companies that hold the approvals for formulations as part of the CIPC Stewardship process and will help to ensure compliance with the Maximum Residue Level (MRL) of 10 mg/kg.

For the 2016-17 season, the new statutory limits for total dose, approved by Chemicals Regulation Directorate (CRD) are 42 grams/tonne for processing (including fish & chip shop supplies and peeling) and 24 g/t for the fresh market. The latest time of application is 14 days before removal from store for sale or processing and is also a statutory requirement.

Additionally, Stewardship best practice, endorsed by the NAAC’s CIPC Applicator Group and Red Tractor Farm Assurance, continues to allow just one application of up to 16 g/t in cold stores as CIPC residue declines more slowly at cold temperature. This applies to all stores to be held below 5°C. This application should be made early in storage during pull-down, before the temperature is decreased below 7°C, for maximum efficacy.

Summary of Stewardship best practice for CIPC use in 2016/17:

Be 2017 Ready

The Stewardship Group is also urging users to ‘Be 2017 Ready’ by taking on board the changes necessary to introduce Active Recirculation as part of the application process. This requires that the fog must be actively and evenly recirculated through the potatoes using the main or supplementary fans and will be manadatory in all stores from July 2017 onwards.

It is recommended that users consult their NAAC CIPC Applicator to discuss this requirement now to ensure that, if steps have not yet been taken, applications can still be made next season.

Here is the definition for Active Recirculation and associated guidance released by PICSG:

Active Recirculation – for application of Chlorpropham (CIPC) to stored potatoes

The active, even movement and recirculation of airflow, through stored potatoes, during and after Chlorpropham application (until the fog has cleared) accomplished via any suitable mechanical means in order to improve application uniformity and maximize product efficacy.

Practical guidance for bulk potato stores
Provision for ‘Active Recirculation’ may consist of a mechanical ventilation system with under-floor ducts, under-pile ducts, or other means of even, through-pile airflow and recirculation.

Typically, reducing airflow velocity is recommended and can be accomplished via the use of Variable Frequency Drives (VFDs or Inverters), or other suitable means.

Practical guidance for box potato stores
Provision for ‘Active Recirculation’ may consist of a mechanical ventilation system capable of even airflow recirculation. This may consist of a permanent / purpose-built ventilation system or a temporary ventilation system utilizing auxiliary fans, plenums, or other means to allow for uniform airflow and recirculation; unmodified overhead throw systems are not acceptable.

Finally, it is important to stress that, where there is mixed cropping, crops such as wheat and onions should not be held in stores which have been treated with CIPC. This is because CIPC can remain within the store structure and residue can then be found in the produce which would considered as non-target crops; these have an MRL set at the limit of detection (0.01 mg/kg).

More information is available, for example, in the Store Assessment of the Red Tractor Combinable Crops protocol at
For further information, see the ‘Be CIPC Compliant’ website at


EAPR Post-Harvest Meeting

Sutton Bridge Crop Storage Research featured prominently at this recent gathering in Wageningen, The Netherlands organised by Glyn Harper and Tjaart Hofman for the European Association for Potato Research. Papers were presented by SBCSR’s Adrian Cunnington, Glyn Harper and Adrian Briddon on AHDB-funded work on store leakage assessment, ethylene use and a novel CIPC treatment system respectively.

Sutton Bridge also featured in many of the posters presented. Over 100 delegates attended the meeting including leading storage specialists from USA, Canada and AHDB-funded students from the UK.

In addition to the formal sessions, delegates had the opportunity to visit local farming enterprises and the hugely impressive, 10,000 student, Wageningen University, the focus of Life Sciences research in The Netherlands.

Papers can be accessed at


New CHAP storage facility at SBCSR

Construction and fit out of new experimental stores at Sutton Bridge Crop Storage Research has continued apace across the summer. The first of two phases is due for handover very soon and features ten 6-tonne capacity storage rooms (pictured below) being built for the new Crop Health & Protection (CHAP) Innovation Centre of which AHDB is a consortium member. More information on CHAP’s activities are available at



Forthcoming events

SPot Farm Walks
AHDB Potatoes has further Farm Walks planned for its SPot Farm sites in Suffolk and Staffordshire in August and Septrember. Places may be limited on some dates. To register go to:

Potato Europe, 14/15 September 2016
The major European potato gathering takes place at Villers-St-Christophe in northern France next month. For full visitor information, see the event website at

For details of the AHDB presence, please go to

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