Any unwanted, out-of-date or revoked pesticides and biocides can be disposed of from January 3 to March 14 2011 as part of Project SOE (Security in the Operational Environment).
Registration will start on December 17 and a one-off registration fee of £20 is payable to Killgerm Chemicals Ltd who are administering the amnesty.
Growers must provide a list of the pesticides and biocides they are disposing, with quantities and information about the condition of the packaging. Disposal of extra pesticides not originally listed will cost £20.
The NFU welcomed the announcement and vice president Gwyn Jones said: "This is a great opportunity to check your stores and dispose of anything that is out of date or no longer legal."