ALBEMARLE COUNTY, Va. (CBS19 NEWS) -- More than 100 trees are being treated at James Monroe's Highland this week to help protect them from the invasive species known as the emerald ash borer.
Officials at the property say they performed the same style treatment two years ago.
So far there have not been any signs of EAB infestation on the white ash trees.
"The treatment seems to be working. We will continue the treatment until the threat passes," said Jason Woodle, of James Monroe's Highland.
Tree experts from Bartlett Tree Experts have been giving a root flare injection of emamectin benzoate, a chemical that kills the larval form of the emerald ash borer.
"When the larvae hatch and they start feeding on the tree, it's already in the tissues of the tree and it kills them," said Gabe Wilkins, of Bartlett Tree Experts.