Spangle galls on the leaf surface of oak

Spangle galls on the leaf surface of oak

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Caption: SEM of young spangle galls on the leaf surface of the oak Quercus robur (Pedunculate oak). Common spangle gall is caused by the gall wasp Neuroterus quercus-baccarum which lays its eggs on the leaf in late summer and the galls then appear in late August. The larvae overwinter in the galls and emerge in the Spring (April) as parthenogenetic females. These females lay their eggs in the catkins of the same tree species, causing the familiar currant galls to form. Males and females Emerge later from this batch of eggs. Magnification: x50 on 8x10" print.

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Keywords: botany, disease, diseases, gall, insect, nature, neuroterus quercus-baccarum, on leaf, parthenogenesis, pathogens, pathology, pest pests, plant, quercus robur, spangle gall

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