To spray or not to spray? That's the dilemma facing school districts engaged in perennial battles with six-legged classroom intruders and harmful campus weeds. It's also a question state and federal officials are under mounting pressure to answer.

At a time when mosquitoes are carrying the deadly West Nile virus and fleas in Colorado have led to at least one death from bubonic plague—a disease that wiped out one-third of Europe centuries ago—pest eradication has become...

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