He explained that under current legislation all products have an end date for their approval. Adlam said: "If the legislation stays as it is there's every likelihood glyphosate will continue to be re-registered.
"However, certain elements of EU legislation will change the parameters of how ingredients are tested and approved. If the parameters change, any product could be lost.
He added: "The change in the definition of endocrine disrupters is a sword of Damocles that is hanging over us because we don't know whether glyphosate will fall within the parameters of endocrine disrupters.
"I don't think we can take anything for granted now. It could be three or four years before definitions come in. You can't say we have anything forever." Many glyphosate product approvals end on 30 June 2012.