 | Durmast Oak - Quercus petraea |
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The Sessile Oak is a deciduous tree growing 40 m. Leaves are 7-14 cm
long and 4-8 cm broad, evenly lobed with 5 to 8 lobes on each side,
and a 1-2 cm petiole. Acorn 2-3 cm long and 1-2 cm broad, maturing
in about 6 months. Sessile and English, or pedunculate oak (Quercus
robur) hybridize naturally with each other, producing trees of
intermediate characteristics, and this can make it difficult to
accurately identify a tree to the species level. |
Figure 1. Durmast Oak - Quercus petraea, Morton Arboretum acc.35-90-1, from seed, is
21 years old. [2]
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| Durmast Oak should be grown in full sun on any soil and is very tolerant of poorly-drained, wet sites. This should make it well suited for the soil conditions found at many urban sites. If landscape nurseries grew this tree more often, it would be specified for poorly-drained urban and suburban landscape sites. Propagation is by seed. No pests or diseases of major concern. [1] |
An oak "hedgehog" gall on a white oak leaf.
This growth is induced by a small cynipid gall wasp whose larvae develop inside.
Several insects attack oak trees. They are usually not important but may become epidemic and kill weakened trees. Economically, the most important are the wood borers. These may damage the wood of standing trees and cause log and lumber defects. White oak is attacked by several leaf eaters including the gypsy moth (Lymantria dispar), orange-striped oakworm (Anisota senatoria), variable oakleaf caterpillar (Heterocampa manteo), several oak leaf tiers and walking stick. The Cynipid wasps cause galls to develop on the leaves, in the acorn or on the cup. |
References
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