(734) 662-1684 Serving Washtenaw County & The Ann Arbor Area Since 1981

Top Ten Tree Problems

  1. Borers: Borers typically attack stressed trees. Adults lay eggs on or under the bark and the larvae feed on the wood further stressing the tree. The best defense against borers is to keep your trees healthy and unstressed. The most notable borer in our area is the Emerald Ash Borer (EAB). New systemic treatments can protect ash trees for three years.
  2. Lace Bug: Lace bugs target many deciduous trees and shrubs and broad-leaf evergreens such as sycamore, oak, hawthorn, andromeda, azalea, and rhododendron. Early detection is the key to getting rid of an infestation. Look for yellow-silver stippling on the topsides of leaves.
  3. Mites: Mites pose a serious threat to a wide variety of plants, and can seriously impact the visual appearance of a plant. Mites favor warm, dry climates, and are an extremely serious issue for many homeowners.
  4. Tent Caterpillars: Caterpillars can weaken many trees and shrubs, increasing the chance of a secondary infestation. Look for egg masses on twigs and bark in fall and winter.
  5. Hemlock Woolly Adelgid: One of the most common pests, these insects can cause the death of a tree if left untreated. They leave behind a telltale white wax and target primarily older trees.
  6. Scale Insects: These insects target primarily hardwoods and conifers. Some signs of an infestation include abnormal leaf and shoot growth, yellow or red leaves, and branch gouting.
  7. Leaf/needle fungus: Various fungal diseases can affect deciduous and coniferous trees and some can lead to decline.  Look for a spotting and/or thinning of foliage in spring and summer.
  8. Winter Injury: Even during mild winters, evergreens can lose moisture and not be able to replenish it. Thus, make sure your evergreens have sufficient soil moisture.
  9. Weevil Insects: Weevils are commonly found on flowers and fruits. Look for notches around the edge of leaves.
  10. Aphid Insects: Aphids are small and pear shaped. An infestation can cause yellow discoloration and defoliation.

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