Oak apples

Oak apples

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Caption: Oak apples on an oak tree (Quercus sp.). These swellings are galls filled with the larvae of the gall wasp (Biorhiza pallida). Eggs are laid beneath the bark of the oak tree, and secretions from the developing larvae cause the tree's tissues to grow faster than usual. The larvae eat this rapidly-growing tissue as they grow. The eggs are laid in spring, usually in late April, and up to 30 mature gall wasps escape from each gall in summer.

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Keywords: animal, attached, biological, biology, biorhiza pallida, botanical, botany, cluster, clustered, development, entomology, fauna, flora, gall, gall wasp, galls, insect, insect life cycle, larva, larvae, larval, leaf, leaves, nature, oak, oak apple, oak apples, oak tree, oak-apple, oak-apples, pathology, pest, pests, plant, protective, quercus sp., stage, tree, wildlife, zoological, zoology

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