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Didymosphenia has been spotted along 7 kilometers of the Rio Espolon and 49 Kilometers of the Rio Futaleufu. (56 kilometers total)
The limit of the infection appears to be the Rio Espolon & Rio Futaleufu confluence. The Futaleufu River coming from Argentina appears clean. The Rio Azul appears clean. Didymo "stalk material" can be found along most of the Rio Futaleufu, at the high water marks, and almost as far as Lago Yelcho.
