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The gall wasp (Andricus quercuscalicis) lays its eggs inside the acorn itself, causing it to mutate. When the infestation first appeared some thought it might wipe out England's oak trees. However, although these galls affect individual acorns and their cups, the net effect is not disastrous. Knopper galls were first recorded in the UK in the 1960s. They have spread rapidly across the country, until now they are one of the commonest oak galls across all England. The name 'pedunculate oak' refers to the situation of the acorns, which arise from long stems (peduncles), as distinguished from the 'sessile oak', where the acorns sit directly on the oak twigs.

thorny oak (Quercus coccifera) in a shrubland in french riviera, summer

Oak (Quercus) in autumn, low angle shot, Bavaria, Germany, Europe

Acorn from Quercus lobata, commonly called the valley oak or roble, is the largest of the California oaks. It is endemic to the state. Santa Rosa, Sonoma County, California

Bare downy oak (Quercus pubescens) deciduous tree and green grass under at Kras, Slovenia

Two solitaire oak trees in front of a dirt road in autumn sunlight. The photograph is taken in Dyrehaven, which is a large public park north of Copenhagen and an UNESCO Heritage site due to the landscape which is designed for the royal par force hunting

Detail of acorns ripening in a Portuguese Oak - Quercus faginea. Autumn. Portugal.

$Larvae of these beetles are xylophagous. They mainly feed on downy oak (Quercus pubescens), evergreen oak (Quercus ilex) and cork oak (Quercus suber). These longhorn beetle are considered a pest of oaks\n\nThey are considered a danger for Quercus Forests$

$Stock photo showing a common English oak tree (Quercus robur). This tree is located close to the coast, where there are very strong winds. This extreme weather has caused the trunk to bend right over (gradually, over the years), so far that the top of the tree is approaching the ground.\n\n* Not AI modified *$

the crown of an oak tree in the countryside

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.

Downy oak (Quercus pubescens) tree at the esge of a meadow

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

Die Stieleiche hat kurze Blattstiele und Blattadern laufen zu den Buchten der Blätter - The pedunculate oak has short petioles and veins run to the bays of the leaves

Tree in Nationalpark Garajonay on La Gomera

Stock photo captures the majestic presence of a growing English oak tree (Quercus robur) standing tall in a peaceful field. Its sprawling branches and sturdy trunk showcase the resilience and timeless beauty of this iconic tree species. Surrounded by open space, the oak symbolizes strength and endurance

Autumn oak trees. Yellow Quercus leaves in the fall. Gavurky. Slovakia.

Environmental protection and ecosystem regeneration themed image.

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