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green acorns on an oak tree
Green acorns in the oak tree
Gypsy moth (Lymantria dispar) on an apple tree closeup
Sessile Oak (Quercus petraea) - Küre Mountains National Park
fresh acorns of Quercus cerris tree
Acorns of german oak tree
Oak leaves with acorn. Foliage nature background. Park
Horizontal closeup photo of fresh new leaves on the branches of an Oak tree in an organic garden in Spring
The fruits of the mulberry tree
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a young growing green acorn. Wildlife
A flowering evergreen oak (Quercus ilex). Lecco. Lombardy. Italy.
branch and trunk close up of Quercus cerris tree
Tiny acorns growing on an oak tree in a forest.
Oak is a plant growing in Estonia
Selective focus on the green leaves of an oak tree in a public park. Autumn morning in Metro Vancouver.
Yellow-green oak leaves on a tree in autumn, Crimea
ripening arbutuses
Acorns on tree agianst blue sky
Clusters of young acorns appearing on an English Oak tree in a country park in South East London.
Sycamore seed growing on a tree. Helicopter seed
oak apple gall from an Oregon Oak that was induced by the California gallfly Andricus californicus, Andricus quercuscalifornicus.
Dried leaves on a tree branch in autumn
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.
Japanese grape tree or Japanese grape, Hovenia dulcis loaded with fruits in a farm in Brazil
Cork Oak (Quercus suber) tree. Luogosanto. Province of Sassari. Sardinia. Italy.
Quercus robur tree branch close up
Oak branches with autumn foliage, autumn season.
acorns of an oak tree
Walnut about to ripen on the branch of the walnut tree in early autumn
Free Images: "bestof:Knopper gall on oak (Quercus robur) induced by Andricus quercuscalicis (gall wasp), Arnhem, the Netherlands.jpg 51 945376 5 852365 en Knopper gall on oak"
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