They oppose the proposed tariff on imports of E187/tonne, which they claim is too high and would cripple their businesses.
The WTO will rule on October 26. It previously agreed with Latin American banana-producing countries that a suggested tariff of E230/tonne was too high.
Corbana, which represents Costa Rican banana producers, has drawn up a suggested
quota-based system, with quotas individually set for each exporting country based on historic volume exports.
Latin American countries could subsequently set future quotas internally, based on historical flows, it argues.
But the Commission remains adamant that a single tariff from January 1 is the only solution.