Ash Borer - Ask Extension
I have 2 Ash trees in my yard in the north part of Broomfield and have detected a couple of bores in the tree and would like to know how to treat them...
Knowledgebase
Ash Borer #190561
Asked June 12, 2014, 9:33 AM EDT
I have 2 Ash trees in my yard in the north part of Broomfield and have detected a couple of bores in the tree and would like to know how to treat them. I also have detected some leaves that are curling up and suspect a treatment of some sort is necessary. I have used a Spectracide Insect killer as a spray and also a Bayer product - Tree and Shrub product that seems to have worked as far as a leaf treatment but not sure of the bore in the trunk. Would like your advice and thank you very much.
norm kvern
norm kvern
Broomfield County Colorado
Expert Response
In order to successfully treat the tree, you'll need to know for certain the cause of the damage. There are several borers in Colorado that attack ash trees. This is a fact sheet about shade tree borers commonly found in Colorado landscapes: http://www.ext.colostate.edu/pubs/insect/05530.html. This is a fact sheet about lilac/ash borer, which is the most common borer that affects ash trees in Colorado: http://www.ext.colostate.edu/pubs/insect/05614.html.
The leaf curl may be a separate issue altogether. One common insect that can cause leaf curl is an aphid. This is a fact sheet about aphids commonly found in Colorado gardens and their management: http://www.ext.colostate.edu/pubs/insect/05511.html.
If you are unsure of what is damaging your ash tree, you can bring samples of the damage as well as photos to the Broomfield County Master Gardeners. The Master Gardeners are usually in the office on Mondays and Thursdays from 10:00 a.m. to 1:00 p.m. You can also drop a sample by and a Master Gardener will contact you with their findings. The Broomfield County Extension office is open Monday through Thursday from 8:30 a.m. until 1:30 p.m. The office is located in the City and County Building at One DesCombes Drive, Broomfield, 80220. You can contact the office by phone at<personal data hidden>.
You can also contact an ISA certified arborist to help you make an accurate diagnosis.
The leaf curl may be a separate issue altogether. One common insect that can cause leaf curl is an aphid. This is a fact sheet about aphids commonly found in Colorado gardens and their management: http://www.ext.colostate.edu/pubs/insect/05511.html.
If you are unsure of what is damaging your ash tree, you can bring samples of the damage as well as photos to the Broomfield County Master Gardeners. The Master Gardeners are usually in the office on Mondays and Thursdays from 10:00 a.m. to 1:00 p.m. You can also drop a sample by and a Master Gardener will contact you with their findings. The Broomfield County Extension office is open Monday through Thursday from 8:30 a.m. until 1:30 p.m. The office is located in the City and County Building at One DesCombes Drive, Broomfield, 80220. You can contact the office by phone at<personal data hidden>.
You can also contact an ISA certified arborist to help you make an accurate diagnosis.
