New legislation on the use of chlorpropham (CIPC) requires potato store owners to use the sprout suppressant at lower dose rates and via ‘active recirculation’.
From July 2017, all store owners must comply with new legislation stating that CIPC applications to stored potatoes must not exceed the maximum total dose rates.
For potatoes destined for processing, this equates to a maximum dose rate of 36g/tonne and 24g/tonne for crop sent to the fresh market.
Maximum dose rates have been ‘stepping down’ since 2012 under the Be CIPC Compliant campaign, following a need to reduce the level of CIPC residue found in potato stores.
But in order to maximise the efficacy of CIPC at lower dose rates, CIPC Stewardship Group chairman, Mike Storey, says store managers should use active recirculation whereby air containing CIPC fog is recirculated around the store.
He says: “Research carried out by AHDB has clearly demonstrated that the use of correct fans can systematically improve the uniformity of CIPC distribution at the lower dose rate and reduce the need for maximum residue exceedance.”
See also: New CIPC rates for this season
In order to help growers comply with the new legislation, the CIPC Stewardship Group has recently launched a new technical guide: the ‘Store Owner’s Guide to CIPC Application’.
It offers solutions for store owners looking to introduce active recirculation systems and details new guidelines for bulk and box potato storage.
According to Adrian Cunnington, chair of the Stewardship Technical Working Group, in 2016 around half of UK stores practiced active recirculation but Mr Cunnington insists more needs to be done.
He says: “There has been quite a lot of activity in the last year to move towards active recirculation but inevitably we still have some way to go and of course, the time available is expiring rapidly.
“We’ve found ways of modifying stores that are much more cost effective than they used to be, so there’s really no reason why people can’t make the necessary changes to their stores.”
The new ‘Store Owner’s Guide to CIPC Application’ will be sent to UK potato growers during February 2017 and is available to download from the Be CIPC Compliant website: cipiccompliant.co.uk
By July 2017: