The European Standing Committee on Plants, Animals, Food and Feed has voted against renewing the approval of Chlorothalonil after the European Chemicals Agency classed the chemical as a category 1 carcinogen.
The agency’s decision followed a similar recommendation by the European Food Standards Agency.
No date has been set for a ban on use.
Perthshire farmer Ian Sands, chairman of NFU Scotland’s combinable crops committee, called the decision a massive setback for the cereal growing sector and said because the product was crucial for controlling fungal disease in barley, the ruling had the potential to impact the whole food and drink industry.
Mr Sands, who owns and contract farms just under 2,000 acres near Balbeggie, said growers would find it hard to understand why a product that has been in use since 1964 has now been classified unsafe.
He added: “It is in use in Canada and its safety seems to depend on which scientist you talk to. It’s the base chemical we use and the only one that’s effective against ramularia.”
He pointed out that a bad fungal infestation can cause a fall in yield of 0.6 tonnes per hectare, equivalent to more than 10% of the crop.
“Ramularia also impairs quality and can increase screenings, hitting those who are growing for a quality market like malt whisky,” he said.
“Chlorothalonil is also an important fungicide to protect other crops such as wheat, both by itself and mixed with other products to manage disease resistance, and alternatives are nowhere near as effective.
“With the number of plant protection products available to growers shrinking, the loss of Chlorothalonil has the potential to make the viability of growing crops border line and, given the huge importance of barley and wheat to the Scottish drinks industry, this could cause serious problems for this iconic sector.”
The deputy director of Soil Association Scotland, David Michie, said it was important for farmers to work across the supply chain to find innovative solutions and alternatives to fungicides.
“Farmers must be supported and enabled to do this, and be connected with researchers, buyers, and agronomists to figure out a way forward,” he said.
“We know that the use of blends, rotations, different varieties and different fertiliser regimes can reduce the incidence of disease, and that we must work with those who are ultimately buying these cereals to meet their quality requirements.”
Scottish Conservative MP for Gordon, Colin Clark said he had written to Defra to alert government about the seriousness of the issue for Scottish growers.
“Having grown barley myself in the wet climate of Scotland, this product was a powerful tool in the arsenal to control fungal disease,” he said.
“This change undermines Scotland’s most iconic crop, malting barley for whisky manufacturing. It is result of the EU reacting to lobby groups, ignoring sound science and 50 years of safe use.”