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• Population: 86,211
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Emerald Ash Borer (EAB) is a non-native wood-boring beetle that attacks ash trees. It is an invasive pest that has rapidly killed tens of millions of ash trees in the US and Canada. The larval stage of EAB feeds under the bark of ash trees, cutting off the flow of water and nutrients, resulting in the tree’s death. It is considered one of the most destructive forest pests ever seen in North America, causing the largest disturbance to our urban forest since Dutch Elm Disease.
What We are Doing
You may have noticed some trees in Duluth neighborhoods are adorned with green ribbons. These ribbons are meant to raise awareness of the emerald ash borer (EAB) and the consequences of infestation among ash trees the City now faces. Please note, the ribbon does NOT indicate a particular tree has been infested, or is slated for removal or treatment. However, a majority of these ash trees are fated to die from this invasive pest.
EAB was detected in Duluth in late 2015, but recently-discovered infestations seem to indicate the borer has been here for a few years already. Unfortunately, widespread ash tree die-off typically occurs within a few years of a local EAB detection. EAB-infested ash trees become brittle and dry and decline very quickly. Ash trees that have died from EAB have a greater risk for sudden failure, potentially causing harm to people and property.
Among Duluth’s boulevard trees, ash is second only to maple in numbers. Approximately 2400 boulevard ash trees will quickly start becoming hazards as the local EAB infestation progresses. Because of this, the City plans to conduct a combination of preservation by chemical injection and pre-emptive removal of living ash trees on boulevards in order to prevent hazardous conditions. Generally, larger and higher-value ash trees will be targeted with injection by the City while declining trees and those under 12” DBH (diameter at breast height) will be removed.
In addition, through a partnership with the Minnesota Department of Agriculture, the City of Duluth is testing out the use of a biological control method with stingless wasps. The wasps work to consume EAB larvae and can help prevent the spread of EAB onto other ash trees. The test area is restricted to Hartley Park. The wasps pose no dangers to humans. Read more about biocontrol HERE.
In accordance with the City Council-approved Emerald Ash Borer Management Plan, the City will begin conducting these boulevard ash tree injections and removals in the Congdon, Morley Hts./Parkview, Hunters Park, and Woodland neighborhoods in 2017.
Most large, healthy boulevard ash trees will be preserved by the City by pesticide injection. Those under 12” in diameter will be removed while those near that measurement could be either removed or injected.
Property owners have the option to preserve an adjacent boulevard ash tree in lieu of removal. The preservation treatment must be a pesticide injection by a certified tree care provider, as specified in the City’s EAB Management Plan. By preserving a tree, you take on the responsibility for scheduling and paying for ongoing treatment coordinated through the following approved tree care providers:
These providers will work with the City to determine if a tree is eligible for injection. Please note that pesticide injection is currently the best known preventative option, but DOES NOT guarantee indefinite protection from an EAB infestation. It is suggested you discuss this with a certified arborist before committing to preserving a boulevard tree.
The Emerald Ash Borer Management Plan provides guidance to City staff on the approved management options for city-managed ash trees in response to the emerald ash borer infestation. The plan was adopted by the Duluth City Council on December 12, 2016
What Residents Can Do
Adult borers typically fly less than ½-mile from their emergence tree. Most long-distance movement of EAB has been directly traced to human movement of ash firewood and other infested materials. This is because the larvae feed and pupate within an inch of the bark and can emerge up to a couple years later. For this reason, the Minnesota Department of Agriculture has established quarantine restrictions for affected counties that regulate the movement of ash logs and lumber, ash tree waste, ash chips and mulch, as well as ALL Hardwood firewood.
The Current quarantine boundaries affecting Duluth are as follows:
SE St. Louis County, which includes Duluth, is under quarantine. The materials mentioned above should not be moved out of the quarantined zone. You can find the map of current quarantined areas here: MDA Quarantine Map. Also see: Minnesota EAB quarantine information with links to the quarantine details, maps, and information about firewood restrictions.
It is also important to not unnecessarily disturb (prune, cut down, etc.) ash trees during the EAB “flight season.” This is the time of year that the adult beetle has emerged from the tree and is looking for new places to lay eggs. An adult will generally re-infest the same tree or one close by unless it is disturbed. Minimizing ash tree activities during this time can slow the spread of the infestation. The MN Dept. of Agriculture defines this period as May 1 – September 30, though in the Duluth area it is likely delayed slightly because it requires a certain amount of accumulated heat.
The City will be managing public trees, but you may have ash trees in your yard or on your property. First you should figure out if your tree is an ash tree. Your ash tree is considered at risk if it is within 15 miles of confirmed EAB detections, which can be viewed on the quarantine map by zooming into an area.
Because EAB kills ash, there are three main courses of action for trees on your property that may cause damage if they fall. You can preserve your tree by treating it with a pesticide at label-specified frequency. You can remove the tree. Or, you can wait and do nothing. Depending on your proximity to the EAB infestation, doing nothing may be fine for a while, but eventually you will probably want to either treat or remove the tree. If you are located within the green-bordered "EAB generally infested area" in the above-linked quarantine map, decisions about your ash trees should be made soon. Removing the tree while it is still alive is less expensive and dangerous than letting it die standing. Dead trees can be brittle, dry, and fail unexpectedly. If you are taking trees down, remember not to take it outside of the quarantine zone!
Treating a tree with pesticides can preserve it. Treatments are most effective when applications begin before it gets infested, though they can also save ash trees with low levels of infestation. Please see the U of M Extension Office treatment considerations, use a decision guide, and contact a tree care professional or professional arborist to help you decide what you should do with your ash trees. If you are considering treating some of your trees, this guide covers some information about insecticide use.
Become familiar with the signs and symptoms of EAB infestation. There are many resources to help you with this including the U of M Extension website, this MDA guide, and this guide from the Emerald Ash Borer Information Network.
It can be difficult to detect EAB in the early stages of infestation. The infestation usually starts towards the top of the tree and works down over a number of years. The first signs to look for are increased woodpecker activity (lighter color where the bark has been removed and woodpecker holes) and thinning of the foliage. Bark cracking over insect galleries and exit holes may not be visible until the later stages of infestation.
If you would like to learn first-hand what to look for on your ash trees, please contact Judy Gibbs with Ecolibrium3 at 218-336-1038 or email@example.com.
Tracking infestations occurs at the state level. The MN Dept. of Agriculture is interested in monitoring the movement of EAB, so if you suspect you have identified an infested tree, note the exact location, take a digital photo if possible, and contact Arrest the Pest at 888-545-6684 or Arrest.the.Pest@state.mn.us.
If you are removing potentially hazardous ash trees on your property, you may want to replant another tree. You can contact a professional or use this guide to help you make a decision on what to plant. The only type of tree more common than ash in our urban forest is maple, so you may want to avoid them to increase the diversity of trees.
MN Dept. of Agriculture
MN Dept. of Natural Resources
University of MN Extension
Emerald Ash Borer Information Network
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