Borers are attracted to unhealthy trees, burrowing in and laying eggs inside the trunk. 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 broad-leaf evergreens such as 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.
Mites pose a serious threat 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 silken, yellow cocoons.
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 Anthracnose Disease
This fungal disease affects deciduous and flowering trees. Look for a spotting 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 pearl shaped. An infestation can cause yellow discoloration and defoliation.