All 28 member states met this week in Brussels, and had been expected to endorse a European Commission proposal to extend authorisation of glyphosate for 15 years until 2031.
Last minute "EU horse trading by some member states" is ongoing today (8 March).
The existing approval expires at the end of June and a decision must be made by then.
European Food Safety Authority (EFSA), which advises EU policymakers, has issued an opinion that glyphosate was unlikely to cause cancer.
The World Health Organization's International Agency for Research on Cancer (IARC) disagreed.