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Gallery

Oaks and oak ecosystems around the world

Portugal

Signs of Holm oak decline observed within a managed silvopastoral system. (Adriana Principe)
PORTUGAL: Signs of Holm oak decline in a managed silvopastoral system (credit: Adriana Principe)
oak trees with the bark stripped off the lower part of the trunk
PORTUGAL: Cork oak (Quercus suber) with the bark stripped (credit: Alexandra Correia)
Summer view of a Holm oak silvopastoral system showing healthy trees and areas of visible tree decline (credit Adriana Principe)
PORTUGAL: Summer view of a Holm oak silvopastoral system showing healthy trees and areas of visible tree decline (credit Adriana Principe)
PORTUGAL: Cork oaks with bark removed after the cork extraction process, a traditional practice in Mediterranean forests. (credit Adriana Principe)
PORTUGAL: Cork oaks with bark removed after the cork extraction process, a traditional practice in Mediterranean forests. (credit Adriana Principe)
forest of oak trees, mostly green and healthy but with some brown or skeleton trees
PORTUGAL: signs of decline in cork oak (Quercus suber) trees amongst otherwise healthy ones (credit: Alexandra Correia)
PORTUGAL: Visible signs of decline in Holm oak trees, marked by canopy thinning and branch dieback (credit: Adriana Principe)
PORTUGAL: Visible signs of decline in Holm oak trees, marked by canopy thinning and branch dieback (credit: Adriana Principe)
Oak trees growing in grassland under a clear blue sky
PORTUGAL: Agroforest system featuring Holm oak trees with ryegrass cultivated in the understory (credit: Adriana Principe)
Oak trees growing in grassland
PORTUGAL: Silvopastoral system featuring Holm oak trees and managed livestock grazing. (credit: Adriana Principe)
An oak seedling growing through twigs and undergrowth
PORTUGAL: Natural regeneration of Holm oak through resprouting or acorn germination ensures the long-term sustainability of silvopastoral systems. (credit: Adriana Principe)
Dead and dying oak trees across a hillside
PORTUGAL: Widespread decline of Holm oak trees across a hillside (credit: Adriana Principe)

Serbia

oak leaves covered in brown raised lumps
SERBIA: Neuroterus quercusbaccarum (common spangle gall wasp) on Quercus robur (credit: Milica Zlatkovic)
oak leaves with green globular galls
SERBIA: Cynips quercusfolii (cherry gall wasp) on Quercus robur (credit: Milica Zlatkovic)
oak tree trunk with dark brown mottled patches
SERBIA: Diplodia seriata (girdling canker) on Quercus robur (credit: Milica Zlatkovic)
oak leaves with a white powdery coating on the underside
SERBIA: powdery mildew on Quercus robur (credit: Milica Zlatkovic)
Oak leaves with white, brown and yellow patches
Tubakia dryina (Tubakia leaf spot fungus) and Corythucha arcuata (oak lace bug) on Quercus robur (credit: Milica Zlatkovic)

UK

Oak trunks with weeping wounds on the stem
UK: Stem weeping, external symptoms of Acute Oak Decline
Oak bark with holes
UK: D shaped exit holes of Agrilus biguttatus beetle on the bark of oak stem
A single oak tree
UK: Young Quercus robur in agroforestry ecosystem in the UK

Ancient Oak Trees

ancient oak tree
Bleinheim Palace in the UK. Some trees are purported to be around 800 years old.
ancient oak tree
Bleinheim Palace in the UK. Some trees are purported to be around 800 years old.
Ancient oak tree
Bleinheim Palace in the UK. Some trees are purported to be around 800 years old.
ancient oak tree
Bleinheim Palace in the UK. Some trees are purported to be around 800 years old.
ancient oak tree
Bleinheim Palace in the UK. Some trees are purported to be around 800 years old.
ancient oak tree
Bleinheim Palace in the UK. Some trees are purported to be around 800 years old.
A single oak tree with a very broad trunk
UK: Ancient oak tree
A very old oak tree
UK: The Repton oak, estimated age 650-750 yrs old