Birch Leafminer
Gray and paper birch are preferred, but yellow, black, European white, and river birch may also be attacked The most obvious sign of infestation is severe browning and distortion of foliage beginning in mid-May (a). Larval feeding causes ... [... more]
Forest Pests |
Birch Skeletonizer
Principal host is white birch, but other native and exotic birches may be attacked. Look for late season browning of foliage and premature leaf drop. By mid-summer, narrow, serpentine mines are visible and white silken molting webs may be found ... [... more]
Forest Pests |
Bronze Birch Borer
White, cutleaf and yellow birch are preferred but other birches are also attacked. Look for top dieback, with first symptoms including sparse, chlorotic foliage. Welts appear on the surface of the stem above borer galleries (a). Adult emergence ... [... more]
Forest Pests |
Birch Lace Bug
These small, flattened insects live and feed on the underside of leaves. While the upper surface of infested leaves becomes mottled and discolored, the undersurface is littered with excrement, cast skins of developing immature lace bugs, and eggs ... [... more]
Forest Pests |
Cedar Apple Rust
The golfball-size galls that form on eastern redcedar (alternate host) are unsightly, but cause little harm to the tree. The primary hosts-apples-experience foliage loss, growth loss, reduced quantity and quality of fruit, and, in some cases, ... [... more]
Forest Pests |
Elm Leaf Beetle
The elm leaf beetle attacks all species of elm. However, in most of its range, the beetle prefers the Siberian elm. When defoliation is severe for several consecutive years, limbs and sometimes the tree may be killed. The beetles may become a ... [... more]
Forest Pests |
Elm Phloem Necrosis
This disease kills more elms than Dutch elm disease in many urban areas. It is prevalent in the eastern half of the nation. The disease is common on winged and American elms, but attacks all elms. Mycoplasma, which are microscopic plants, cannot ... [... more]
Forest Pests |
Honeylocust Pod Gall Midge
Look for the development of pod galls as leaflets expand. From a distance, leaflets may appear deformed or dried up, but closer examination reveals swollen, globular galled tissue (a). There are several generations a year. The dainty adult flies ... [... more]
Forest Pests |
Odontota dorsalis (Thunberg)
Black locust is preferred, but apple, birch, beech, cherry, elm, hawthorn, and oak may also be attacked. The overwintering flat, red and black adult beetles appear on leaves in May and those of the next generation appear in July (a). Larval ... [... more]
Forest Pests |
Linden Looper
The linden looper and eastern oak looper cause defoliation in the spring. Host species attacked include the red and white oak groups, maples, elms, hickories, ash, and cherry. Heavy defoliation usually occurs in May and June and can cause growth ... [... more]
Forest Pests |
Oak Skeletonizer
In winter, look on the bark or fallen leaves for the characteristic white cocoons. During the growing season, examine leaves for caterpillars, molting webs along veins on the underside of leaves, and skeletonized patches. The tiny pale-yellow ... [... more]
Forest Pests |
Ceratocystis fagacearum
Oak wilt is the most destructive disease of oaks in the upper Mississippi Valley. It also occurs throughout most of the South and can kill oaks rapidly, causing heavy losses. Red oaks are affected more frequently and severely than white oaks. The ... [... more]
Forest Pests |
