The hard exchange of words between the two left a bitter taste, despite Uribe's offer to consider changing the fumigation method from aerial to manual so as to minimize the contamination.

CENTERFORSECURITYPOLICY: A blow to anti-drug policy

Critics of Plan Colombia worry too about the aerial spraying of herbicides, the method used by the Colombian police to try and eradicate coca.

ECONOMIST: Putumayo��s tense wait for the arrival of Plan Colombia