Aerial Herbicide Spraying (Ecuador v. Colombia)


On 31 March 2008, Ecuador filed an Application instituting proceedings against Colombia in respect of a dispute concerning the alleged “aerial spraying [by Colombia] of toxic herbicides at locations near, at and across its border with Ecuador”. Ecuador maintained that “the spraying has already caused serious damage to people, to crops, to animals, and to the natural environment on the Ecuadorian side of the frontier, and poses a grave risk of further damage over time”. It further contended that it had made “repeated and sustained efforts to negotiate an end to the fumigations” but that “these negotiations have proved unsuccessful”. As basis for the Court’s jurisdiction, Ecuador invoked Article XXXI of the Pact of Bogotá of 30 April 1948, to which both States were parties. Ecuador also relied on Article 32 of the 1988 United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances.

By a letter dated 12 September 2013, the Agent of Ecuador, referring to Article 89 of the Rules of Court and to an Agreement between the Parties dated 9 September 2013 “that fully and finally resolves all of Ecuador’s claims against Colombia” in the case, notified the Court that his Government wished to discontinue the proceedings in the case. By a letter of the same date, the Agent of Colombia informed the Court, pursuant to Article 89, paragraph 2, of the Rules of Court, that it made no objection to the discontinuance of the case as requested by Ecuador.

According to the letters received from the Parties, the Agreement of 9 September 2013 established, inter alia, an exclusion zone, in which Colombia would not conduct aerial spraying operations, created a Joint Commission to ensure that spraying operations outside that zone had not caused herbicides to drift into Ecuador and, so long as they had not, provided a mechanism for the gradual reduction in the width of the said zone; according to the letters, the Agreement set out operational parameters for Colombia’s spraying programme, recorded the agreement of the two Governments to ongoing exchanges of information in that regard, and established a dispute settlement mechanism.

In consequence, the President of the Court, on 13 September 2013, made an Order recording the discontinuance by Ecuador of the proceedings and directing the removal of the case from the Court’s List.

This overview is provided for information only and in no way involves the responsibility of the Court.

Institution of proceedings

Written proceedings


Fixing of time-limits: Memorial and Counter-Memorial
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Fixing of time-limits: Reply and Rejoinder
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Extension of a time-limit: Rejoinder
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Removal from list
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Press releases

1 April 2008
Ecuador institutes proceedings against Colombia with regard to a dispute concerning the alleged aerial spraying by Colombia of toxic herbicides over Ecuadorian territory
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2 June 2008
Aerial Herbicide Spraying (Ecuador v. Colombia) - Fixing of time-limits for the filing of the initial written pleadings
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2 July 2010
Aerial Herbicide Spraying (Ecuador v. Colombia) - The Court authorizes the submission of a Reply by Ecuador and a Rejoinder by Colombia and fixes time-limits for the filing of these pleadings
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21 October 2011
Aerial Herbicide Spraying (Ecuador v. Colombia) - Extension of the time-limit for the filing of Colombia's Rejoinder
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17 September 2013
Aerial Herbicide Spraying (Ecuador v. Colombia) - Case removed from the Court’s List at the request of the Republic of Ecuador
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