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North Central
Research Station
1407 South Harrison Road, Suite 220
East Lansing, MI 48823

(517) 355-7740

Emerald Ash Borer - Conventional Soil, Trunk, and Foliar Insecticide Trials

[photo:] Insecticide injection using Kioritz soil injection method.

Effective methods to control the emerald ash borer are urgently needed. Currently, cutting down and chipping infested trees is the only known means to kill this insect. While it may not be possible to save trees that are already heavily infested, there may be other control methods that could save lightly infested trees and protect healthy trees from becoming attacked. We are investigating the efficacy of various insecticides for controlling the emerald ash borer.

In April 2003, we treated trees with [photo:] Insecticide injection using Mauget trunk injection system soil applications of imidacloprid using a high volume high pressure system, a low volume hand-watering system, and the Kioritz micro-soil injections system. In late May, we injected trees with imidacloprid or Bidrin using the wedgle or mauget trunk injection systems. In early June we treated ash trees with foliar cover sprays including Sevin, Orthene, Tempo, and Talstar. In early July, half of the treated trees received a second cover spray. Leaf and twig samples were collected from all treated trees in mid-June and mid-July. Adult emerald ash beetles were caged on the foliage in the laboratory to assess leaf feeding and mortality. Adult mortality was found to be very high (up to 100%) on foliage from trees treated with Bidrin or the foliar cover sprays.

[photo:] Insecticide injection using Wedgle injection system Emerald ash borer adult mortality was somewhat delayed but also fairly high on trees treated with imidacloprid by the mauget trunk injection system. As of July 2003, soil applications and injection of imidacloprid with the wedgle have not been as effective in causing adult mortality. Larval mortality within the trees will be evaluated in fall 2003.

Principal Investigators:

Therese Poland and Deb McCullough (Michigan State University)

USDA Forest Service - North Central Research Station
Last Modified: October 22, 2004