Ask a Question
Notify Me On Question Update
Email this Question
Is There Any Way To Eliminate Borers That Leave What Looks Like Sawdust At The Base Of Our Aspen Trees?
Rate This FAQ
Your aspen trees have aspen borer, an insect in the long-horned or round-headed beetle group. This insect problem is very common. The injury is caused by the larvae feeding on the inner wood of the trunk. Their tunneling weakens the wood and allows the invasion of canker and decay fungi. Borer wounds typically “sap” or “bleed.”
Aspen is an attractive host for the insect, especially when the aspen tree is already under some kind of stress or decline. Common stresses for aspen trees in our area are iron deficiency (yellow leaves), poor watering regime (too much or too little), aspen leaf spot (fungus causing leaf spot - common following wet springs or when sprinklers water the leaves of trees), oystershell scale (insect that feeds on limbs and trunk of tree, sucking out sap), and aspen borer (beetle larvae that bore holes into trunks of trees). Aspen is not well adapted to living in the valley areas. They do much better in the mountains.
Suggestions to reduce aspen borer problems:
* Don’t plant aspen, select another tree species that is well suited to our valley growing areas and not as susceptible to insect injury.
* Grow aspen in a grove with continual renewal of trunks rather than as single specimen trees in your landscape. Aspens have a strong ability to sucker and send up new shoots. Remove aspen trunks when signs of borer injury are observed (sap running down trunk, accumulation of sawdust at base of hole or tree) and allow new trunks to fill in the open spaces - aspen are quick growers.
* Keep aspen trees as healthy as humanly possible - treat with a chelated iron product in the spring to reduce iron chlorosis, prevent sprinkler water from getting onto leaves (promotes aspen leaf spot disease), prune out dead and dying limbs, water properly (water as a tree, not your lawn - this means infrequent, deep waterings), remove trunks infected with borers as soon as they are observed. A healthy, vigorous tree will resist borer attack.
* You cannot remove the damage that the borers have already done. You can help (sometimes) reduce further damage to the injured trunk and others in the area by well-timed insecticide treatments to the trunks. This is costly, time consuming and involves some risks (pesticides should always be used properly - follow the label directions and wear appropriate protective clothing; there may also be environmental safety concerns).
* You must treat before the adult beetles lay their eggs in the late spring through summer. Once eggs hatch and larvae bore into the trunk, the damage is done. Chlorpyrifos (Dursban) insecticide products labeled for shade trees are the recommended treatment. Apply a spray that drenches the main trunk of the trees every 3-4 weeks from May-July in northern Utah.
Submit Your Suggestion
Other Questions In This Topic
- I saw a small, dark green, spruce tree planted next to the corner of a home in a nearby neighborhood. Are their dwarf varieties of this tree? It is not an dwarf Alberta Spuce- I have already verified this. If so, what are they called. I would like to find one for my yard.
- How can I conserve water and still have a nice lawn?
- I have a scarlett red maple. It's about 8 years old and last year the leaves didn't get very big. This year, it hasn't even began to bloom yet although, It has tiny buds. I noticed that the bark in some places peels off very easily. Under the bark, it looks like there may be some black flecks (maybe bug feces). I only noticed one little red colored bug under where I peeled the bark. I don't see any other bugs anywhere, even at the base. Do you think it could have a disease or bugs? I am going to put some fertilizer steaks around it and pour some Bayer Advanced tree and shrub insect control around the base of the tree. Is it too late to spary it?
- How late in the fall season can you lay sod in northern Utah?
- I need to know what is best for killing vines? I have a fence full and I would like to get rid of them.
- I have a curly willow that was topped about four years ago. Now it needs to be trimmed. Can I cut the branches back to where they were cut last?
- We have a lot of scrub oak around our home. In some spots we have some ground cover and other area are bare. We would like to add a nice ground cover to mix in with the oak in these bare areas. Do you have suggestions for ground cover? Also, in one particular area, we have a large amount of grass growing in the ground cover surrounding the scrub oak. What is the best way to get rid of this grass? Is there a ground cover that can overtake the grass?
- I have a son that lives in west Eagle Mt. We Put in sod for a lawn about two years ago and for two seasons it did great. Half of it is now dead and the other half is struggling. Prior to putting down sod, the ground was thoroughly tilled and lots of compost material was added (the kind that is made available in some green recycling yards and mixed with treated effluent from the sewage treatment plant.) Nitrogen was also added to the soil and the lawn was watered regularly. What has happened and what can I do to get a good lawn here?