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Oak leaf with galls of Gall wasp, close-up.

oak tree branch with acorns

Plant Galls on a Oak Leaf, Sierra de Guadarrama National Park, Segovia, Castile Leon, Spain, Europe

The Valley Oak, can sometimes be riddled with large growths along the stem. Small wasps produce these oak apples or galls. The large oak apples, are induced by the gallwasp Andricus californicus. Shollenberger Park; Petaluma Wetlands; Petaluma; Sonoma County; California. Quercus lobata.

Acorns and oak leaves on white background with clipping path included.

Oak branch isolated on white background. Oak apples on the undersides of oak leaves, are caused by chemicals injected by the larva of certain kinds of gall wasp.

Oak galls on an oak leaf close-up

An oak is a tree or shrub in the genus Quercus. Oaks have spirally arranged leaves, with lobate margins in many species; some have serrated leaves or entire leaves with smooth margins. The fruit is a nut called an acorn or oak nut borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on their species.

Oak galls, ink nuts on oak. Cynips quercusfolii

Oak autumnal leaves with acorns. Background image of leaves.

These galls are produced by tiny Cynipid wasps, which go through a complicated life cycle involving two stages of development. In June, a generation of male and female wasps hatch from currant galls. The adults mate and the female lays fertilized eggs on the undersides of oak leaves. These cause the creation of the spangle galls, in which the grub matures. The spangle galls fall from the leaves in September and the wasp continues to grow within the leaf litter, producing a female-only generation in the following spring.

Oak Apple Wasp Gall Plant Growth

Gall wasps are insects that lay their eggs in plant tissue. This is where growths, known as Gqallen, develop. The larvae of the gall wasps grow in these growths. Most species of gall wasps occur in the Mediterranean region and on the Black Sea, there are no gall wasps in the tropics.

Sessile Oak (Quercus petraea) - Küre Mountains National Park

Tree infection. Flat lay.

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Oak branch with acorns and oak leaves isolated on white.

Dried leaf

Japanese grape tree or Japanese grape, Hovenia dulcis loaded with fruits in a farm in Brazil

Autumn in the garden - dry autumn leaf

A close-up shot captures the delicate details of an oak branch with vibrant green leaves. In the center, a young acorn nestles against the branch, hinting at the promise of future growth. The background, softly blurred, showcases the lush foliage of the surrounding trees bathed in warm evening light. This image highlights the serene beauty and intricate wonders of nature.

oak apple gall from an Oregon Oak that was induced by the California gallfly Andricus californicus, Andricus quercuscalifornicus.

Biorhza pallida on Quercus robur

Colorful autumn leaves.

Aglaomorpha quercifolia is used in Ayurvedic medicine and other sytems of medicine.

A tiny acorn growing on an oak tree in a forest.

Macro photo of tree pests eggs on oak leaves isolated on white background. Chemically induced leaf blister galls of a gall wasp Neuroterus numismalis

Close-up of many green leaves of an English Oak tree (Quercus robor), as it comes into full leaf in midsummer in central England

Cherry galls on oak leaf, caused by gall-wasp (Cynips quercus).

oak green leaf and raindrops, macro photo

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