Elm: Aphids categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-12-03 10:06 Elm woolly aphid Photo by: A.L. Antonelli Biology Aphids are soft-bodied, pear-shaped insects that feed on the leaves. They are yellowish to green in color and approximately 1/16″ long. Aphids often produce honeydew, a sweet, sticky substance which can develop a […]
Elm: Bark beetles categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-10-14 02:24 Bark beetle larval galleries Photo by: A.L. Antonelli Biology Elm bark beetles are about 1/8″ long and may be shiny brown or black. Adults, larvae, or pupae overwinter under bark. Adult beetles emerge in the spring (around May), leaving tiny […]
Elm: Carpenterworm categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-07-11 09:52 Carpenterworm larval mine Photo by: Unknown Biology Carpenterworms are the larvae of a mottled gray and black moth. The caterpillars are white to pinkish red with a dark head and 1″ to 3″ long when mature. They bore in the trunk […]
Elm: Elm leaf beetle categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-07-11 09:53 Elm leaf beetles Photo by: Unknown Biology Elm leaf beetles feed on the leaves both as larvae and as adults. The larvae appear in late spring (typically May-June) from eggs laid by overwintering adults. The 1/4″ larvae are greenish […]
Elm: Elm leafminer categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-07-11 09:56 Elm leafminer damage Photo by: J. O’Brien Biology Elm leafminers feed by removing green tissue from between upper and lower surfaces of the leaves. Symptoms of feeding by the yellowish or green larvae include large brown to gray-brown blotches on […]
Elm: European elm scale categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-07-11 09:58 European elm scales Photo by: A.L. Antonelli Biology The European elm scale is a reddish-brown to purplish scale surrounded by a conspicuous fringe of white, waxy material. They sometimes resemble mealybugs. The mature females are about 1/8″ in diameter. […]
Elm: Spiny elm caterpillar categories: Elm Elm Insects Ornamental trees Ornamentals last review date: 2025-07-11 10:05 Spiny elm caterpillar Photo by: S.J. Collman Biology The spiny elm caterpillar is the larval stage of the mourningcloak butterfly. The adult is approximately 2 1/2″ across, with purplish brown to black wings bordered by a creamy yellow stripe […]