After hatching, the larvae feed on the water-and nutrient-conducting tissue beneath the bark layer, disrupting the tree’s ability to move water and food through the tree’s vascular system. Dave Smitley, Ph.D., Michigan State UniversityĪdult emerald ash borers, which grow to about a half-inch in length, lay their eggs in holes they create in the tree’s bark. This may happen in two to three years for a smaller city." After the first ash tree dies from EAB in any given city, it typically takes four to five years for most of he trees to die (for a city like Lansing).
"Ash trees in the Detroit area are almost all dead now. Since then, it has spread to Illinois, Indiana, Kentucky, Maryland, Minnesota, Missouri, New York, Ohio, Pennsylvania, Virginia, West Virginia, Wisconsin, Ontario and Quebec. It is thought to have entered North America aboard a cargo ship, and was first discovered on this continent in 2002 in the Detroit area. The emerald ash borer is native to eastern Russia, northern China, Japan and Korea. The research indicates that trunk injections of TREEage (emamectin benzoate), acetamiprid and Arborjet IMA (imidacloprid), as well as soil drench applications of Arena (clothianidin), Merit and IMA, Bayer Advanced (all imidacloprid), and Safari (dinotefuran) all exhibited canopy thinning of 30 percent or less as well as acceptable larval density. Researchers defined acceptable protection as canopy thinning of 40 percent or less as well as larval density of 5 per square meter. The team of Michigan State entomologist Dave Smitley, Ph.D., research technician Kevin Newhouse and research assistant Terry Davis conducted the research trials from 2005 to 2008 on ash trees in an East Lansing, Mich., neighborhood.Īt least three insecticides were effective at protecting the trees as trunk injection systems, while at least five others exhibited control as a soil drench, according to the research.
In all, results of 30 treatments involving different timings were examined along with an untreated control plot. Researchers examined the results of six products applied as trunk injections and six others as soil drenches. Likewise, as EAB devastates unprotected ash populations, its numbers eventually will decline in those areas, improving the outlook for desired (and protected) trees. All is not be lost for ash trees in the range now occupied by the invasive emerald ash borer.Īccording to recent studies conducted by researchers at Michigan State University, several treatments provided acceptable protection against the pest and the damage it can cause to ash trees.
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