The Australian Competition and Consumer Commission (ACCC) is investigating allegations of unconscionable conduct towards growers by one of the country’s major vegetable processors.

The ACCC has written to suppliers of McCain Foods (Aust) Pty Ltd in Tasmania and Ballarat, Victoria asking for details about contract negotiations dating back to 2010, abc.net.au announces.

The letter, obtained by the ABC, says the ACCC “has received complaints alleging McCain has engaged in misleading or deceptive conduct in its dealings with potato growers”.

The letter also states: “The ACCC is concerned McCain may have engaged in unconscionable conduct as a result of its conduct towards growers, including by exerting undue pressure on growers during contract negotiations.”

McCain Foods is a privately owned, multinational frozen food producer, manufacturing products including French fries, pizzas and prepared meals.

It runs factories in Ballarat, Lisarow in New South Wales and Smithton in Tasmania.

McCain Foods agricultural manager Gregory Bullock confirmed the company was aware of the investigation and it provided the information they requested.

Tasmanian potato growers called for an ACCC investigation in 2012 when they alleged McCain cut contracts and ceased collective bargaining.