Pesticides such as "Tree-age" could protect ash trees from emerald ash borer beetles if applied before the infestation occurs, according to this article. Pesticides cost about $250 per tree every two years, which is cheaper than removing and replacing infested trees at a cost of $700 to $1,200. "There is no reason for a landscape ash tree to die from emerald ash borer anymore," said Deborah McCullough, an entomology and forestry professor at Michigan State University.

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