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chestnut gall wasp
Dryocosmus kuriphilus
48.7165, 2.1256
Field Notes
Description:
Large gall on chestnut leaf, red on the upper side, green & reddish on the underside. The infected leaf is stunted.
Habitat:
I spotted this gall in the woods behind our house; many of of the trees here are chestnut trees (Castanea sativa).
Notes:
If the ID is right, this is bad news, because it means that the worst chestnut pest has now reached the vicinity of Paris, and is thus spreading North.
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