Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Ametastegia glabrata - Dock Sawfly

small sawfly - Ametastegia glabrata - male Unknown Hymenoptera - Ametastegia glabrata Unknown Sawfly? - Ametastegia glabrata unidentified Ichneumonidae - Ametastegia glabrata
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Tenthredinidae (Common Sawflies)
Subfamily Allantinae
Tribe Empriini
Genus Ametastegia
Species glabrata (Dock Sawfly)
Other Common Names
Dock False-worm
Explanation of Names
Ametastegia glabrata (Fallén 1808)
♂ 6.1-6.4 mm, ♀ 7.4-7.8 mm(1)
native to, and widespread across, the Palaearctic(2); adventive in NA and now transcontinental in Canada & n. US (NS-BC to NC-IL-UT-OR)(1), Chile, Australia (Malipatel et al. 1995)
hosts: mostly Polygonaceae (esp. Polygonum, Rumex), also Chenopodium, etc.(2)(3)
Life Cycle
fully grown larvae move from host to form pupal cell in substrata such as apples, various stalks, twigs & canes, rotten wood, etc. (and thus may be reared from unrelated plants); 3 generations a year(1)
introduced in NA probably from Europe before 1860 (Dr Smith, pers. comm.)
may damage other plants (such as raspberry) in areas where primary hosts are abundant (Malipatel et al. 1995)
Internet References
Fact sheet (Beers & VanBuskirk 1993)(3)
Species page (Lindsey 2012)
Works Cited
1.Nearctic sawflies. IV. Allantinae: Adults and larvae (Hymenoptera: Tenthredinidae)
Smith D.R. 1979. Agricultural Research Service, USDA Technical Bulletin No. 1595. 172 pp.
2.Keys to the insects of the European part of the USSR. Vol. 3. Hymenoptera. Part 6.
Zhelokhovtsev A.N., Tobias V.I., Kozlov M.A. 1993. Keys to the Fauna of the USSR 158: 1-432.
3.Beers E.H., Brunner J.F., eds. (2013) Orchard pest management online