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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Symphyta" - Sawflies, Horntails, and Wood Wasps » Common Sawflies (Tenthredinidae) » Nematinae » Willow Sawflies and allies (Nematini) » Nematus » septentrionalis group (Nematus septentrionalis group) » Nematus castaneae
Photo#1001530
Sawfly larvae found on American chestnut suckers September 26, 2014 - Nematus castaneae
Copyright © 2014 whimbrel

Sawfly larvae found on American chestnut suckers September 26, 2014 - Nematus castaneae
Lee, New Hampshire, USA
September 26, 2014
These were found by a class of 4th graders last week grazing on the leaf margins of American chestnut suckers. When we returned today, one branch of suckers had been totally denuded and the whole herd of sawflies had moved on to other branches. I've been unable to identify the species. Learned that there is a chestnut sawfly but was unable to find any images. Any help would be greatly appreciated. The children would really like to know what kind of sawfly species this is.
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Contributed by whimbrel on 26 September, 2014 - 3:51pm
Last updated 26 September, 2014 - 5:19pm

Tenthredinidae, Nematinae
OK for Craesus castaneae. Yes, very rarely found these days, especially adults. The adult is very similar to #986406, with enlarged hind basitarsi.
… Dave Smith, 29 September, 2014 - 7:25pm login or register to post comments

Moved
Moved from ID Request.
… metrioptera, 26 September, 2014 - 5:19pm login or register to post comments

Craesus casteneae...
These larvae are rarely seen now because most of these trees (that were once very common), were susceptible to various fungal diseases including chestnut blight that reduced their numbers significantly.

See reference here.
… Ross Hill, 26 September, 2014 - 3:57pm login or register to post comments

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