The Emerald Ash Borer has been widely publicized as a serious threat to Michigan ash trees. Indeed, this pest is spreading northward from the core area in southeastern Michigan and outward from localized outbreak areas at an alarming rate. Emerald ash borers have now been found in Saginaw, Bay City, Mount Pleasant, Midland, and the entire lower peninsula of Michigan. If you have ash trees in your landscape, you will have some decisions to make regarding those trees.
The pest is not selective when it comes to ash trees. It will attack them and ultimately kill them, unless they are protected. Fortunately, there are very effective preventive treatments available. The very best, as proven by research at several universities, is TREE-Age, emamectin benzoate.
2014 is our twelfth year using the Arborjet system for treating ash trees. Among the ash trees we have treated with this system, none of the healthy ones have become infested and the trees which were already infested have at least stayed the same with no worsening or have improved. We have done over 12,000 ash treatments and have observed excellent control of Emerald Ash Borers. We have treated trees in Midland, Sanford, Edenville, Coleman, Bay City, Essexville, Standish, Pinconning, Linwood, Kawkawlin, Birch Run, Vassar, Saginaw, St. Charles, Freeland, Auburn, Frankenmuth, Mt Pleasant, Lake Isabella, Weidman, Alma, Ithaca, Stanton, Edmore, Blanchard, Clare, Farwell, Lake, Harrison, Beaverton, Gladwin, Sugar Springs, Houghton Lake, Petoskey, Elk Lake, Traverse City, Empire, Harbor Beach, Sebewaing, Port Austin, Pointe Aux Barques, and many other towns.
INSIST ON EMAMECTIN FOR YOUR ASH TREES!
We have been using TREE-Age, (emamectin benzoate) since May of 2008, when it first became available. Emamectin has been tested by Michigan State University researchers and found to protect ash trees with 99 to 100% kill rate on Emerald Ash borer adults and larvae. A recent publication fact sheet confirms the superiority of this chemical over all others. See pages 13 and 14 of the publication at this link: http://emeraldashborer.info/files/Multistate_EAB_Insecticide_Fact_Sheet.pdf
There are several methods of administering chemicals to trees, but we believe the Arborjet system is the very best, based on the research and on our own experience. Small holes are drilled, retainer plugs are placed and the chemical is injected into the active sapwood of the tree, using a quikjet injector or tree IV. These treatments give two years of control with one treatment and give both better control and longer lasting control than any other method.
Drilling to apply this chemical is NOT a problem for the tree!
Some companies will advise that trees should not be drilled to administer chemicals and will advise other methods of application. There are several problems with this argument: 1) Drilling is the only way to administer the very best treatment that can save infested ash trees and protect them for a full two years 2) Trees infested with ash borers need life-saving treatment administered in any way possible 3) a recently published report documents that the trees do not suffer harm after these treatments- the trees show excellent healing response, growing good healthy wood over and around the injections sites with no decay or other problems. See this link: http://www.cityofelgin.org/DocumentView.aspx?DID=12393
1. Valuable ash trees should be treated before infestation if possible. Trees larger than 8 inch trunk diameter should be treated by trunk injection.
2. If ash trees are showing thinning, defoliation and/or branch dieback, they may be salvaged if damage is not severe. Injection plus fertilization may be needed.
3. Injection with emamectin (TREE-Age) using the Arborjet system should be done every two years to prevent initial infestation or further infestation or damage. If scale infestation is present, we can use an additional chemical with the emamectin.
4. Trees smaller than 8 inch trunk diameter may be treated by basal soil drench or ground injection using imidacloprid. Homeowners can treat the small trees with imidacloprid available from garden centers. See page on homeowner ash treatment.
5. The cost (see below) varies based on the chemical used and tree size because larger trees need higher dosage per trunk diameter inch. Usual cost is 7 to 16 dollars per trunk diameter inch. It is usually far less expensive to treat the tree to keep it alive than to pay to have it removed when it dies.
6. CAUTION! Not all treatments are created equal. The only homeowner treatment that should be used is imidacloprid ground drench on trees under 8 inch diameter. Sprays are much less effective for either ash borers or scale. Trunk injection by micro-infusion, specifically with the Arborjet system is proven to be superior to other methods. Micro-injection of Pointer insecticide using the Wedgle is often offered as a two year treatment, but studies have shown that trees had continuing canopy dieback even with treatments every year- see page 9, right column on the fact sheet at this link: http://emeraldashborer.info/files/Multistate_EAB_Insecticide_Fact_Sheet.pdf
Lawn care companies and companies without certified arborists on staff may not be using the optimal methods. We recommend that you find a company with Certified Arborists guiding the treatments or doing the treatments. We always have a certified arborist guiding the treatments.
COST OF ASH BORER INJECTIONS
EMAMECTIN (TREE-Age) charge for treatment is 7 to 16 dollars per trunk diameter inch. The 7 dollar rate is for trees less than 10 inches diameter. The rate per inch is higher for bigger trees, up to 16 dollars per diameter inch in jumbo trees (over 40 inch diameter.) The treatment should be done every two years. Ongoing studies are suggesting that three year control may be possible with this chemical if administered at higher dosage. Further studies are needed before we can recommend it for three year control.
BOTTOM LINE COST amounts to about 4 to 8 dollars per trunk diameter inch per year to provide optimal control of ash borers and other ash pests. So a 10 inch ash tree costs about 35 dollars per year to keep alive and healthy. Compare that to the cost of having the tree removed- 350 (front yard) to 700 dollars (fenced in back yard), depending on location. So you can keep the tree healthy for 7 to 14 years for the same cost as having it removed.
FREE ESTIMATE OF COST OF TREATMENT. We can come and measure your trees to give you an estimate of the cost of treatment and advise you as to which chemical should be used. Or, you can measure your trees yourself by measuring around the tree (circumference) at chest height. Then multiply that number by 2 (for trees 36 inches around or less) or 3 (37 to 60 inches around) or 4 (61 to 90 inches around) or 5 (91 to 120 inches around) to determine the approximate cost of treating that tree for two full years. If we treat multiple trees at one address or in one neighborhood, discounts are possible. Also, we offer payment plans for large contracts.
GUARANTEED EFFICACY. We are so confident in TREE-Age that we offer a money back guarantee. If any tree that is in reasonably good shape when treated dies of Emerald Ash Borer infestation, we will refund the cost of treatment. This warranty is good for the recommended duration of action and circumstances noted above. If requested, we will provide this warranty in writing.