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How to Kill Ash Borer Beetles

Ash borer beetles have bullet-shaped, green metallic bodies that reach up to about a half inch in length. They're native to Asia and migrated to the United States in 2002, becoming a widespread nuisance. They bore into into ash trees and lay their eggs so the larvae can feed on the wood, which causes damage to the trees. Common ash trees that borer beetles infest include white ash (Fraxinus americana) which grow in U.S. Department of Agriculture plant hardiness zones 4 through 9, and green ash (Fraxinus pennsylvanica) which grow in zones 3 through 9. Systemic soil-drench or granular insecticides containing imidacloprid and clothianidin can kill and prevent ash borer beetle infestations when applied annually in early spring or early fall.

Things You'll Need

  • Flexible tape measure
  • Gloves
  • Tree and shrub insect control granules or liquid
  • Garden hose
  • Watering can
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Instructions

  1. Granular Insecticide

    • 1

      Measure the circumference of the tree trunk in inches about 4 1/2 feet from the ground with a flexible tape measure. Put on a pair of gloves before handling the insecticide.

    • 2

      Measure out 1/4 cup of granules per inch of trunk size. For a tree with two or more trunks, measure each one separately, add the measurements then multiply the total by 0.75 to get the total inches. Apply the granules evenly around the base of the tree, extending to 2 feet beyond the trunk. For trees with a trunk diameter larger than 30 inches, apply the granules to 3 or 4 feet beyond the trunk.

    • 3

      Water the granules thoroughly using a watering can or garden hose, so they soak into the soil.

    Liquid Insecticide

    • 4

      Measure the circumference of the tree trunk in inches about 4 1/2 feet from the ground with a flexible tape measure. Put on a pair of gloves before handling the insecticide.

    • 5

      Measure out 1 ounce of liquid concentrate per inch of trunk size. Mix it into 1 gallon of water in a watering can. For trunks larger than 50 inches, use 2 gallons of water.

    • 6

      Pour the solution onto the soil evenly around the base of the tree, extending to 2 feet around the trunk.

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