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Gall on Centaurea ?nigra

Observed: 8th July 2011 By: flowerpainter
Gall on Centaurea ?nigra
Description:

Gall on knapweed stem; growing on roadside in longish grass;looks like C nigra rather than C scabiosa;several chambers inside; fat white larvae about 1mm long; Gall itself c 15mm long

Identifications
Species interactions

No interactions present.

Species with which Isocolus scabiosae interacts