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Storage Bulletin - August 2013

Publication Date: 
4 August 2013


AHDB Potatoes has been running a series of potato storage roadshows to highlight the latest position on CIPC and to introduce the Potato Industry CIPC Stewardship Group’s new ‘Be CIPC Compliant’ campaign. If you use this sprout suppressant please take note of the points below:

CIPC is currently subject to a review by the Advisory Committee on Pesticides following continued detection of Maximum Residue Level exceedances in testing by Defra’s Pesticide Residues in Food (PRiF) Committee. Although the outcome of that review is not now expected until after the end of September, Approval Holders have agreed to proactively introduce new recommendations on the product label for 2013/14, with the support of the stewardship group. These are detailed below:.

TIMING OF FIRST APPLICATION First treatment recommended within 3 weeks after harvest (or at the earliest occasion thereafter) even in the absence of signs of breaking dormancy.
(holding temperature 5oC or below)
Only one application of CIPC up to the maximum individual dose per season recommended. The application should be made before the temperature is reduced below 7°C. Recirculate store air for at least 6 hours without cooling prior to application.


Positive ventilation is recommended in all store types. 

Additionally, there is also now a requirement to complete a Stewardship store checklist (copy available here) prior to application and this will become a Critical Failure Point in 2013/14 for Red Tractor Farm Assurance.
The Potato Processors’ Association (PPA) has also stated that its members will only take supplies from growers who have used an applicator accredited to the National Association of Agricultural Contractors’ CIPC Applicators Group for the coming season. If you are planning to use CIPC next season, it is important to speak with your contractor now to plan your storage and to ensure you follow best practice at all times. Further information, including a list of contractors, appears at or contact Sutton Bridge to arrange a briefing session on 0800 02 82 111.

Are you getting value from your store?

Against a background of rising costs, it is worth thinking a little harder about the efficiency of your storage. Maximising returns through the maintenance of quality readily springs to mind when considering how well stores perform but those returns can also be improved by controlling costs.
The key to this consideration is having access to accurate information on storage costs. This starts with the installation of a dedicated electricity sub-meter on each store. Specialists in energy management say that you are virtually guaranteed to save 10% on your bills just by raising your own awareness of energy use. If a store uses 35 kWh/tonne/year it’ll cost around 35p for every tonne stored, so a £300 meter installation for a 1000 tonne store can pay for itself inside a year.
AHDB Potatoes-funded R&D work carried out by Sutton Bridge CSR and Farm Energy has shown as much as a 3-fold difference in running costs across stores within the same sector. Being the wrong end of that range will seriously compromise your ability to compete! Have a think about:

Does your store suffer from detached or delaminated insulation? Condensation within the structure is a common cause and, if it occurs, the thermal protection it offers is compromised, so it may be time to consider an upgrade.

Also known as variable frequency drives, they work like a dimmer switch on fans or pumps, allowing their speed to be adjusted to match the store's needs.
Inverters should now be fitted wherever CIPC applications are being made in bulk stores. Research and commercial experience has now clearly shown more effective and even CIPC residue distribution through their use and CIPC usage rates can be reduced to circulate the fog during and immediately after application. Take a look at for more information.
Inverters can also offer reductions in energy bills as reducing fan speeds to 80% of full speed provides a 50% saving in electricity use. Recent new store installations have been featuring ever-larger fans (up to 100 cfm/t or 0.05 m3/s/t) fitted into large ducts to provide a major step-up in drying capacity but also the capability to lower airflows using inverters to more traditional airflow rates during holding.
With fans often using at least half their cost in energy each year, it is well worth considering whether improvements in control and significant savings can be made by replacing ageing ventilation systems. Talk to your systems supplier if you wish to investigate the options for replacing fans in your store.
Look out for more from this project in the next bulletin…

Dates for your diary:
8 August Potatoes in Practice, Balruddery Farm, Dundee, DD2 5LJ
22 August Yorkshire Potato Day, Whole Crop Marketing, Driffield, Yorkshire
29 August East of England Potato Day, Tuddenham, Suffolk
27/28 November, BP 2013, Harrogate, Yorkshire
13 February 2014, Storage Conference, Peterborough
For further details, please see

AHDB Potatoes Storage Advice Line
Call free for help on any aspect of potato storage on 0800 02 82 111


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