Taken together, these data suggest that several species may be masquerading under the label Lepidosaphes ulmi. Economic importance: The. Lepidosaphes ulmi (L.) Hanson, T., and E. B. Walker. [n.d.] Field guide to common insect pests of urban trees in the Northeast. Waterbury, VT: Department of. Lepidosaphes ulmi also known as oystershell scale are Scale Insects that is a pest on woody plants. The small insects attach themselves to bark and cause.

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Department of Forests, Parks and Recreation. Beech, birch, maple, ash, poplar, willow, elm, lilac, apple, pear, cherries and many other plants.

Look for tiny brown to gray oystershell-shaped scales, usually densely packed, on the bark a, b. Foliage may appear thin and chlorotic and there may be areas of lepixosaphes crown that lack leaves or where there are scattered clumps of leaves.


The life cycle varies with the host tree species. In general, insects overwinter in the egg stage in groups of under the scale cover. Crawlers emerge in May and move to feeding sites on twigs and branches.

Adult females are present in July. By late July, they have formed a scale covering beneath which the white eggs are laid. The “armor” of the Oystershell scale may be lifted to expose a tiny legless adult female or a batch of eggs. This insect tends to cover entire branches before populations spread to a new area of the host tree.

Lepidosaphes ulmi

If scales are heavy enough to cover branches, host dieback is likely to result. Branches that are heavily infested should be pruned out. Known enemies include lady beetles, parasitic wasps, and mites. Additional control measures are often needed.

Oystershell scale | insect |

Dormant oils are effective against overwintering populations, and systemic or contact insecticides can be used to control crawlers. Summer oils may also be effective. Insects of Eastern Forests.


Insects That Feed on Trees and Shrubs. Insects Harmful to Forest Trees.

Oystershell Scale

Insects of Eastern Hardwood Trees. Oystershell Scale Lepidosaphes ulmi L. Infestations are usually confined to twigs and branches.