e/Acute oak decline

Information
has gloss	eng: Acute oak decline is a new disease that infects oak trees in the UK. It mainly affects mature oak trees of over 50 years old of both of Britains native oaks, the pedunculate oak (Quercus robur) and the sessile oak (Quercus petraea). The disease is characterised by the trees bleeding or oozing a dark fluid from small lesions or splits in their bark. Unlike chronic oak decline, acute oak decline can lead to the death of trees within 4 to 5 years of symptoms appearing. The number of trees affected is not known but is thought to number in the low thousands, with a higher number of infected trees being found in the Midlands. It is thought to be caused by a bacterium but it is currently not known which species is involved but scientists are actively trying to discover what is responsible. It is thought that at least three genera of bacteria are responsible.
lexicalization	eng: acute oak decline
instance of	c/Plant pathogens and diseases