Phytophthora Ramorum (P. ramorum)
Symptoms of Phytophthora Ramorum:
Phytophthora Ramorum causes wilted, withered shoot tips with blackened needles
Infected shoots shed their needles which affects the trees health and appearance
Cankers bleed prematurely, this also shows signs of critical health
The fungus spreads easily in moisture and water
About Phytophthora Ramorum:
P. ramorum is a fungus-like pathogen which causes extensive damage to a range of trees and plants. The disease is known in the USA as ‘sudden oak death’ where as in the UK its known as ‘Larch tree disease’ and ‘Japanese larch disease’. However, the strains of the pathogen found in Britain have had little effect on British native oak species. The first UK finding was made in 2002 at a garden centre in Sussex, whereas the first record of P. ramorum on a mature tree in the UK was on a 100-year-old southern red oak in 2003.