Phythophthora cinnamomi

[armybloke]

I have attached a series of photographs I took at Alice Holt showing the affect of P. cinnamomi on Quercus sp. The roots of these oaks were air-spaded to reveal the extent of damage. Apart from the P.cinnamomi taking hold Armillaria gallica was also present but tests showed that the fungus arrived as a result of the stress the tree was under.

 

P. cinnamomi

 

 Over 2000 sp of trees and shrubs are now infected

 Attacks root and root collar

 1st recorded New Forest 1930’s

 Dieback of maidens and coppice = poor coppice regeneration

 Distribution associated with climate change

 Increase in air temperature improves sporolation and reproduction opportunities

 

I hope you have found this useful

[Fungus]

Armillaria gallica was also present ... the fungus arrived as a result of the stress the tree was under.

 

Marco,

This must be the case, as Armillaria gallica (= A. lutea/bulbosa/cepistipes) is a saprotrophic Armillaria species only capable of decomposing dead wood, which also explains why the black oose must come from the Phytophthora.

[Tony Croft aka hamadryad]

good piece of info work and images, nice one, thanks for taking the time fella.