Poisons for killing off plant and animal nuisances are rapidly becoming more selective, so that they do their job without hurting species that man wants to preserve. Last week Dr. James W. Moffett of the U.S. Fish and Wildlife Service was getting encouraging results with a selective chemical designed to deal with the predatory eellike sea lamprey which has invaded the Great Lakes and almost exterminated the valuable lake trout (TIME, May 9). The lamprey, which bypassed Niagara Falls via the Welland Ship Canal, attaches itself to fish with a tooth-armed sucker and...
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