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European Gypsy Moth - Lymantria dispar dispar
European Gypsy Moth
Photo by: Susan Ellis,
The European gypsy moth (EGM), Lymantria dispar dispar, is one of North Americas' most destructive invasive forest pests. It was accidentally introduced into the United States near Boston, MA in the late 1890s. Since its introduction, EGM has expanded its range to encompass the mid-Atlantic and Northeastern States, as well as Counties in Ohio, Michigan, Indiana, Illinois, and Wisconsin. Because EGM introductions have been detected in western states including CA, OR, UT, and WA, considerable efforts are made each year at the state and federal levels to detect new infestations, eradicate isolated populations, and limit the spread of EGM beyond the known infested area.

Lymantria dispar dispar Risk MapThe EGM risk assessment provides an objective, science based approach to quantifying the risk of EGM introduction, establishment, and susceptibility. The goal of the project is to: 1) improve the effectiveness of the EGM survey, 2) increase timeliness of detections outside the known infested area, and 3) identify places that require further monitoring. The following EGM risk assessment products were developed by the USDA Forest Service, Forest Health Technology Enterprise Team in co-operation with the Animal and Plant Health Inspection Service, Plant Protection and Quarantine, and the U.S. Geological Survey staff members, to address the needs of EGM Program Managers at both the State and Federal levels.

Risk Maps
Contiguous US Preview PDF
Short Range Introduction Picture Preview 114 KB Adobe Acrobat Reader PDF file 502 KB
Long Range Introduction Picture Preview 164 KB Adobe Acrobat Reader PDF file 772 KB
Combined Introduction Picture Preview 161 KB Adobe Acrobat Reader PDF file 812 KB
Establishment Suitability Picture Preview 187 KB Adobe Acrobat Reader PDF file 902 KB
Detection Likelihood Picture Preview 151 KB Adobe Acrobat Reader PDF file 862 KB
Survey Sample Area Picture Preview 160 KB Adobe Acrobat Reader PDF file 635 KB
Maps and Text PDF files of how each map was produced.
Contiguous US   PDF
Short Range Introduction   Adobe Acrobat Reader PDF file 605 KB
Long Range Introduction   Adobe Acrobat Reader PDF file 871 KB
Combined Introduction   Adobe Acrobat Reader PDF file 910 KB
Establishment Suitability   Adobe Acrobat Reader PDF file 932 KB
Detection Likelihood   Adobe Acrobat Reader PDF file 885 KB
Survey Sample Area   Adobe Acrobat Reader PDF file 655 KB

European Gypsy Moth Information:

USFS Gypsy Moth Information

USDA Gypsy Moth Information (Website)

USDA Gypsy Moth Program Manual (PDF)

Slow the Spread (STS) of the Gypsy Moth (Website)

Working Group:

Cook, Gericke L. – APHIS PPQ
Kennaway, Lisa – APHIS PPQ
Leinwand, Ian I. F. – CNT
Withrow, John R. – CNT
Jarnovich, Catherine – USGS
Sapio, Frank J. – USFS FTHET

Advisory Group:

Chaloux, Paul – APHIS
Liebhold, Andrew – USFS
Lance, David R – APHIS
Man-Son-Hing, Anthony – APHIS
Mastro, Victor C – APHIS
McPherren, Patrick W – APHIS
Spaulding, Julie S – APHIS

Frank Sapio
FHTET Director

Related Topics

    Invasive Pest Risk Maps
    FHTET Invasive Species Sample Design Tool
    National Insect and Disease Risk Maps (NIDRM)
    SPB Hazard Maps
    Insect and Disease Aerial Detection Surveys (ADS)
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