Phytophthora ramorum

CuPC33 Lab Test: Positive

Kills oak, larch and other species of tree. Causes Sudden Oak Death which is having devastating effects on oak populations in North America and which is now a concern in the UK and Europe. Symptoms include bleeding cankers on the trunk and dieback of foliage leading to death. The main victim in the UK is Japanese larch and millions have already been felled in SW England in an unsuccessful attempt to prevent spread.