william wolf tree surgeon

Pest and Disease Identification

Pest and Disease Identification

Dryad's saddle (Polyporus squamosus)

Correct identification of pests or disease leads to appropriate management.

Recently there are a number of new pests and diseases appearing, that are becoming more widespread.  At William Wolf Tree Surgery, we have experience and understanding of the various afflictions affecting trees, keeping up to date with the latest research and findings relating to tree disease.

Many insects, fungi and bacteria use trees as a host, often with no serious consequences, but their effect may look dramatic, such as leaf damage. Unfortunately, some can seriously affect a trees health without being visually obvious.  We are able to identify disease problems, provide advice and management stratergies.

Some fungi can cause mechanical weakness in trees, if this is suspected, we are able to investigate, using specialist decay detection equipment to determine the extent of decay, enabling informed descisions to be made about tree safety.

Recent pests and disease that are causing concern are:

Sudden Oak Death (Phytophora ramorum) - a fungus like pathogen hosted by a wide range of species including Rhododendron, Oak and Larch that cause damage and death. It is a notifiable disease, recently it has infected a number of larch plantations in the Southwest and Wales.  Symptoms include bleeding stems, dicolouration and dieback of leaves.

Acute Oak Decline - thought to be bacterial, causes decline in tree health that may result in death within 4 to 5 years. Affects Oak trees, symptoms include stem bleeding and canopy decline.

Bleeding Canker of Horse Chestnut (Pseudomonas syringae pv aesculi) - affects Horse Chestnuts, symptoms include stem bleeding and bark cracking, can cause branch death and tree death.

Horse Chestnut Leaf Miner (Cameraria ohridella) - Larvae of the leaf mining moth feed between the upper and lower surfaces of Horse Chestnut leaves.  Symptoms are leaf drying and browing, by august the whole tree can look autumnal.  Causes seasonal leaf damage.

Oak Processionary Moth (Thaumetopea processionea) - caterpillars of this moth feed on the foliage of Oak and other species causing defoliation. European in origin, recently colonies have been found in parts of London.  The hairs of the caterpillars can result in unpleasant skin irritation and allergic reaction.

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