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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.
Macro close-up of oak leaf galls (Quercus spp.) formed by gall wasps (Cynipidae) on green foliage in a summer forest habitat. The image shows two yellow-green galls on a single leaf with sharp detail in the foreground and a soft bokeh background. Captured with shallow depth of field, this nature macro emphasizes texture, form, and natural growth for scientific, editorial, or commercial use.
photographing the wildlife of eugene, oregon - u.s.a. - july 2025
Quercus lobata, commonly called the valley oak. It is endemic to the state. Springtime; Santa Rosa Plain; Santa Rosa; Sonoma County; California. Globular galls up to several centimeters in diameter are frequently attached to twigs of mature specimens of valley oak. These house the larval stage of small indigenous wasps Andricus quercuscalifornicus.
Oak tree or Quercus (Italian tree)
Close-up of Fresh green Foliage of Quercus rubra, Roteiche
Quercus robur is a species of flowering plant in the beech and oak family, Fagaceae. It is a large tree, native to most of Europe and western Asia, and is widely cultivated in other temperate regions.
sole green old oak on green meadow
A nature scene featuring an aged tree stump surrounded by regrowth of Quercus leaves, symbolizing resilience. The composition beautifully highlights the harmony of life and decay against the blurred green forest background.
Green leaves of the oak Quercus muehlenbergii on a branch
Acorn of oak tree (Quercus robur)
Side shoots an oak
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
Tree of a pin oak (Quercus palustris) in the Topcider park, Belgrade, Serbia
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
lonely tree a the field against cloudy sky
Quercus ilex holly oak leaves
The oak Quercus agrifolia grown in a park
An enchanting view upward into the sprawling branches of an Oak tree (Quercus), set against the bright skies of Denmark. The vibrant green foliage and dappled sunlight inspire peace and admiration for nature's design.
Oak in summer
Close-up of many green leaves of an English Oak tree (Quercus robor), as it comes into full leaf in midsummer in central England
Environmental protection and ecosystem regeneration themed image.
Macro image of a trees fruit in Autumn.
Spring oak leaves in sunlight
Giant oak tree at Vlasim ,Czech Republic, Europe
Sunrise Mt Rainer Washington
Stock photo shows a tall, columnar oak tree (Quercus robur 'Fastigiata') stands prominently in a landscaped garden. Known for its upright growth and dense foliage, this deciduous tree showcases vibrant seasonal colour
Oak in summer
Quercus suber (cork tree) leaves
Free Images: "bestof:Eiche Lohr, 2.jpg Eiche Sendelbach own 2011-07-03 Rainer Lippert Cc-zero Quercus robur"
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