The midwest has many types of insects that cause harm to your trees and shrubs. Some of these insects are nothing more than a nuisance, others are benifical. However, there are several types that do great damage to trees and shrubs and need to be addressed. The following list is a small portion of the insects that we face in our area. We will update this from time to time.
Facts about borers
Shade tree borers are insects that develop underneath the bark of trees and shrubs.
Certain beetles and moths are the most common borers.
Most shade tree borers can successfully attack only trees that are injured or stressed.
Shade tree borer development takes from one to three years to complete. Adult stages of these insects occur outside the tree.
Control of shade tree borers includes maintaining growth and vigor of the tree or shrub.
Insecticides can best control shade tree borers if they are applied at the correct time. Sprays and injections work well on most borers in our area.
Emerald ash borer (EAB)
Emerald ash borer (EAB), Agrilus planipennis Fairmaire, is an exotic beetle that was discovered in southeastern Michigan near Detroit in the summer of 2002. This insect is devastating Ash trees in Michigan, Ohio and Indiana. The Emerald ash borer has not been discovered in Nebraska so far. In many areas the Emerald Ash borer was brought in on firewood from out of state, it can go undetected for several years. We are unsure when it will make it to our area. We are monitoring control methods. There are several treatments being used to try and control the problem. Some of these are currently used to control borers in our area. We will keep you informed as to this insects progress and what your options are when it arrives.
The past several seasons we have experienced increasing numbers of bagworms. The bagworm is a perennial insect pest of arborvitae, juniper, pine, spruce, and many other evergreen species. It also attacks certain deciduous trees such as black locust, honeylocust, and sycamore.
Bagworms first appear in late May or early June. They are easily controlled by spraying an insecticide. However, it has been our experience that the hatching period is not always uniform around the area. Therefore, we have a two spray program to combat this pest in mid June and early July. If your trees become infested, bagworms can destroy your evergreens.
Zimmerman Pine Moth
ZPM causes the greatest damage to Scots and Austrian pines. Infestation is determined by the presence of resin or pitch masses on the tree trunks where the larvae are feeding beneath the bark. Fresh pitch masses where the larvae are active will be white, soft, and shiny. Pitch masses from earlier generations will be hard, gray, and dull. Spraying the trunk of the pine tree in April and again in August should control this pest.