Lepidosaphes ulmi

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1325097
Taxonomy
Kingdom: Animalia
Phylum: Arthropoda
Class: Hexapoda (including Insecta)
Order: Hemiptera
Family: Diaspididae
Genus: Lepidosaphes
Species: L. ulmi
Scientific Name
Lepidosaphes ulmi
(Linnaeus)
Common Names

oystershell scale

Author: Eric Day, Virginia Tech

Contents

Plants Attacked

Dogwood, elm, hickory, poplar, apple, etc.

Description of Damage

Bark become cracked and scaly, trees loose vigor, foliage is dwarfed and spotted with yellow. In severe infestations may kill plant.

Identification

Scale cover resembles small oyster shell. The adults are usually clustered together and in severe infestations may cover the bark of infested branches completely.

Life History

Eggs laid in late fall, 40-150 per female. Hatching occurs in late spring. Crawlers move around 1-2 hours to 1-2 days before settling. The scales are white in color at first but become brown with maturity. They mature about the middle of July, mate, and lay eggs. This second generation develops and by late fall they lay the eggs which overwinter for the spring generation.

Control

Sprays should be applied at time of crawler hatch and emergence from the old females, in mid-late May and again in late July or early August.

Remarks

Populations tend to congregate on one or a few branches or on entire tree, seldom a few scales scattered over the host.

External links

Day, E. Oystershell Scale. August 1996.

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