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Knopper gall on acorn

Knopper gall on acorn

C001/6281

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50.4 MB (1.7 MB compressed)

3636 x 4847 pixels

30.7 x 41.1 cm ⏐ 12.1 x 16.2 in (300dpi)

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Credit

ADRIAN BICKER / SCIENCE PHOTO LIBRARY ADRIAN BICKER / SCIENCE PHOTO LIBRARY

Caption

Knopper gall on acorn. Close-up of two acorns from an Pedunculate Oak (Quercus robur) tree. The lower one has been infected by the parasitic larva of a gall wasp (Andricus quercuscalicis), causing the formation of a knopper gall (growth, spiky, lower centre). The larva develops within a hard inner gall, which provides it with both food and protection. Parthenogenetic (all female) adults emerge from the galls during the following spring.

Release details

Model release not required. Property release not required.

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