Commission Implementing Regulation (EU) 2017/1491 of 21 August 2017 renewing the approval of the active substance 2,4-DB in accordance with Regulation (EC) No 1107/2009 of the European Parliament and of the Council concerning the placing of plant protection products on the market, and amending the Annex to Commission Implementing Regulation (EU) No 540/2011 (Text with EEA relevance. )