United States Department of Agriculture
U.S. Forest Service
Caring for the land and serving people

Lymantria dispar Digest

Lymantria dispar Treatments

Acres Treated by Program by Year 1967 to 2020

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The following is a summary of acres treated for Lymantria dispar Eradication, Slow The Spread and Suppression by year.
Year Eradication Slow The Spread Suppression
1970 0 0 122,518
1971 0 0 94,310
1972 625 0 75,229
1973 14,686 0 90,927
1974 1,790 0 174,011
1975 815 0 43,790
1976 1,040 0 38,634
1977 8,804 0 96,146
1978 0 0 169,680
1979 19,237 0 52,477
1980 5,445 0 80,294
1981 7,503 0 350,120
1982 28,526 0 726,730
1983 12,247 0 598,660
1984 34,413 0 512,205
1985 275,183 0 519,787
1986 197,093 0 589,231
1987 19,314 0 698,425
1988 30,709 0 749,528
1989 21,368 0 797,836
1990 28,615 0 1,518,857
1991 46,343 0 1,103,516
1992 76,073 0 960,776
1993 48,757 6,023 582,210
1994 83,949 30,759 618,845
1995 83,069 35,238 435,584
1996 71,416 36,818 313,693
1997 50,180 29,926 67,517
1998 90,728 55,952 96,565
1999 101,840 28,159 160,779
2000 4,992 177,842 251,660
2001 1,440 275,973 464,121
2002 10,611 575,243 286,167
2003 16,540 631,760 103,034
2004 11,105 663,960 79,571
2005 36,778 414,366 7,292
2006 20,196 541,293 163,655
2007 5,829 426,308 191,700
2008 3,300 413,516 542,951
2009 1,578 419,138 321,572
2010 1,296 532,152 6,069
2011 5,777 526,084 3,167
2012 2,056 544,444 2,842
2013 1,040 410,800 60,114
2014 1,865 440,293 8,771
2015 1,663 513,818 34,756
2016 3,665 441,994 168,324
2017 3,444 374,269 54,976
2018 14,324 362,384 26,761
2019 2,405 297,025 3,363
2020 3,874 296,781 168
Total 1,513,546 9,502,318 15,219,914
Note: Total treatments acres do not include the number of acres treated more than once. All acres include all Ownership/Funding Types.
Source: USDA Forest Service Lymantria dispar Digest 2.1.01 released on 1/12/2022.