The emerald ash borer, a pest that kills any unprotected ash tree it infiltrates, is causing problems in Indiana. One way to fight the problem is to use a pesticide called Tree-Age, which costs about $200 and is injected into the tree and protects it from the borer, says Greg Gilman, a pesticide-application-division manager. Protecting ash trees from the borer can be pricey, so Gilman recommends counting ash trees and then evaluating options.

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