The European Parliament has voted to tighten rules on pesticide use and ban at least 22 chemicals deemed harmful to human health.
The UK government, the Conservatives and the National Farmers' Union all oppose the new rules, saying they could hit yields and increase food prices.
The rules have not yet been approved by the 27 member states' governments.
The draft law would ban substances that can cause cancer or that can harm human reproduction or hormones.
UK farmers say the law would "seriously threaten" UK food production. It could wipe out the carrot industry and seriously affect many other crops, the National Farmers' Union has warned. more