He said: "Growers should respond to the call, but factually rather than emotionally. They should say, 'This is my business, this is the labour I require, these are the results of my attempts to recruit that labour locally, and this is the shortfall'."
The MAC has been commissioned to evaluate evidence for and against the scheme's retention by the Home Office, which will make a decision on its future later this year.
At present, SAWS is due to end at the end of this year, when nationals of the two current supplier countries, Romania and Bulgaria, lose restrictions on working in the UK.
The Call for Evidence document can be downloaded from the MAC page on the Home Office website.
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