Phytophthora lateralis is an aggressive, fungus-like pathogen of Lawson cypress trees. It mainly attacks the roots of trees and can spread up through the trunk resulting in the rapid decline and death of the tree. Thought to originate in Asia, the disease is the main cause of mortality in Lawson cypress in its native range […]
Elm yellows is a disease of elm trees caused by a type of bacterium known as a phytoplasma. Symptoms of the disease can range from yellowing of leaves to dieback of foliage and branches. Elm yellows has been found affecting elm trees in North America and a few European countries, but in 2014 it was […]
The pine-tree lappet moth has caused severe defoliation of Scots pine trees on many occasions in Eastern Europe. An initial assessment of the potential impact of the moth in Britain is that it presents a significant threat to the pine forests of northeast Scotland – and further afield if allowed to spread. This Pest Alert […]
Red band needle blight is an economically important disease affecting a number of coniferous trees, in particular pines. The disease has a world-wide distribution but until recently it was mainly of concern in the Southern Hemisphere. In much of the world, including Britain, it is caused by the fungus Dothistroma septosporum. Red band needle blight […]
Horse chestnut is an important amenity tree species which has been significantly affected over the past decade by a widespread outbreak of bleeding canker disease. Symptoms include rust-coloured or blackened bleeding cankers on the stem and branches, which can lead to tree mortality. The causal agent of this disease is the pathogenic bacterium Pseudomonas syringae […]
The insect Dendroctonus micans, a bark beetle that is found in North West Europe, has for long been held, by forest entomologists, to constitute a potential threat to coniferous plantations in Great Britain, although it is not yet established here. Accordingly, in June 1964, Mr D. Bevan, the Commission’s senior forest entomologist, and Mr J.M.B. […]
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