Valid Names Results
Eulecanium excrescens (Ferris, 1920) (Coccidae: Eulecanium)Nomenclatural History
- Lecanium excrescens Ferris 1920b: 37. Type data: U.S.A.: California, Palo Alto, on cultivated English walnut [=Juglans regia].. Holotype, female, Type depository: Davis: The Bohart Museum of Entomology, University of California, California, USA; accepted valid name
- Eulecanium excrescens (Ferris, 1920); Lindinger 1933b: 159. change of combination
- Eulecanium excressens (Ferris, 1920); Camacho & Chong 2015: 8. misspelling of species epithet
Common Names
- excrescent scale Gill1988
Ecological Associates
Hosts:
Families: 6 | Genera: 9
- Betulaceae
- Corylus avellana | EFSA2023g
- Fabaceae
- Wisteria | Malump2005
- Juglandaceae
- Juglans regia | Ferris1920b
- Rosaceae
- Malus | EFSA2023g
- Prunus | EFSA2023f
- Prunus americana | EFSA2023g
- Prunus dulcis | EFSA2023g
- Prunus persica | EFSA2023g
- Pyrus communis | EFSA2023g
- Sapindaceae
- Acer pseudoplatanus | EFSA2023f
- Ulmaceae
Geographic Distribution
Countries: 3
- China | EFSA2024g
- United Kingdom
- England | Malump2005
- United States
- California | Ferris1920b
- Connecticut | Koszta1996
- New York | Koszta1996
- Oregon | Koszta1996
- Pennsylvania | Koszta1996
Keys
- Koszta1996: pp.345 ( Adult (F) ) [Northeastern North America]
- Gill1988: pp.40 ( Adult (F) ) [USA, California]
Remarks
- Structure: See colour photograph in Gill (1988). The nymphs of E. excrescens are orange or pale brown with rectangular whitish encrustations on their surface; the first instar nymphs are mobile (crawlers). (EFSAf)
- Biology: According to Maluphy (2005), E. excrescens has one generation/year; the nymphs overwinter and reach maturity in April. The nymphs of are orange or pale brown with rectangular whitish encrustations on their surface he adult females lay eggs in May; crawlers emerge in May-June and settle on the leaves; in Autumn, before the leaves fall, they move from the leaves to the twigs to overwinter. The large globular adult females (10-13 mm) are dark brown, covered by grey powdery wax. They lay eggs in May, each female lays about 2,000 eggs. (Malumphy, 2005)
- Economic Importance: Damage consists in sap sucking, excretion of honeydew and the development of black sooty mold which reduces the aesthetic value of the plant. (Pellizzari, 2010a)
- General Remarks: Good description and illustration of the adult female given by Gill (1988) and by Kosztarab (1996).
Illustrations
Citations
- BenDov1993: catalog, 127
- CamachCh2015: distribution, host, 8
- DowellGiJe2016: distribution, 114
- EFSA2023b: dispersal, distribution, economic importance,
- EFSA2023d: diagnosis, distribution, economic control, economic importance, taxonomy, 33-34, 45, 46, 144-149
- EFSA2023e: biology, diagnosis, distribution, economic control, economic importance, taxonomy, 21, 29, 61-65
- EFSA2023f: distribution, host, taxonomy, 37, 42, 112-125
- EFSA2023g: diagnosis, economic importance, host, host distribution, survey, 135-153
- EFSA2023h: economic importance, host, host distribution, taxonomy, 132-151
- EFSA2024e: economic importance, host, 22-23
- EFSA2024g: control, diagnosis, economic importance, host, 38
- Ferris1920b: description, distribution, host, illustration, taxonomy, 37-39
- Gill1988: description, distribution, host, illustration, taxonomy, 42,47
- KondoWa2022a: distribution, host, list, 10
- Koszta1996: description, distribution, host, illustration, taxonomy, 345,348-350
- Lindin1933a: taxonomy, 159
- Malump2005: distribution, economic importance, host, 45-49
- MalumpBa2012: distribution, economic importance, host, 20,38,39
- Nakaha1981: taxonomy, 284
- Pelliz2010a: economic importance, life history, 150
- Yang1982: description, distribution, host, taxonomy, 191
