I think trying to plant a few acres of anything in Panama will prove quite difficult due to the pest pressures you are finding. The key to success would be a diverse planting of multiple species, so that pest loses are greatly reduced.
Permaculture instructs that we sould seek to imitate nature as a means to success. Several acres of any one thing is not working along the patterns of nature. Please refrain from the discussion of posion on this website, we arent into that at all. Never a solution.
DE would have real difficulty in its effectiveness in your humid climate because it needs to stay dry to maintain its effectiveness. So I doubt that DE is a workable solution.
Polyculture for the win. Need to consider a diverse species guild that would have plants that natually deter the ants, other species that are undesirable to the ants, some catch crops that draw the ants away from your desirables, and just a few of the desirable species that the ants are destroying. Balance.
btw, love those leafcutter ants. just fascinating. sure they are mighty efficient at denuding a seedling, but in their own place, they are amazing creatures.