The EU has voted to withdraw approval for methiocarb-based slug pellets, including Draza forte and Decoy Wetex.
According to Bayer CropScience, which manufactures the pellets, publication of the amending regulation is expected by next month, and is likely to allow continued sale of methiocarb slug pellets for a maximum of six months from the entry into force date, follwed by a 12-month use-up period.
It estimates that sales will be probably permitted until the end of August 2014, with farmers having until the end of August 2015 to use up stocks.
Its molluscicides manager Peter Stacey said: "2014 will be the last season that methiocarb slug pellets can be sold in the UK.
"Their loss will be a major blow for many growers and could result in many more crops being rejected."
The ruling does not affect other uses of methiocarb, such as in Bayer's seed treatment Mesurol.