Tree Pee !

[Kveldssanger]

Indeed. More phosphorus = less mycorrhizae (crudely-speaking).

[sean]

I'm pretty sure that the highest number of Oaks with Acute Oak Decline in Richmond Park were those that grew in the immediate vicinity of the car parks. These areas had the highest concentrations of dog urine in the whole park. Whether these trees were weakened by urine and therefore became more susceptible to AOD remains to be seen. I guess we will have to wait and see what the research in the park tells us?

[David Humphries]

........ I guess we will have to wait and see what the research in the park tells us?

 

I'm over there in a couple of weeks to meet with Simon on a cross CoL/RP working party on tree management, I'll see if there's been an update on the findings from the research.

 

 

 

.

[timbernut]

Could the AOD affected trees, in the car park mentioned above, have been weakened by ground compaction/root damage? I only ask because on a RFS visit to an estate last year AOD was brought up as the owner was losing a few mature trees to it, a site warden (and ex cutter) from the FC said in few woods he had been to AOD only seemed to be affect trees that had machinery passing by (no closer than 2m reapetedly (harvester and forwarder). There was no visible damage but presumed root compaction below surface.

I then had a look in a couple of blocks we had thinned of syc 18mths or so ago and sure enough found 3 or 4 dead and dying trees all within a few feet of extraction route, all with agrilus holes! Sorry for slight derail but I thought it might be of interest, to you more learned types

[sean]

Could the AOD affected trees, in the car park mentioned above, have been weakened by ground compaction/root damage? I only ask because on a RFS visit to an estate last year AOD was brought up as the owner was losing a few mature trees to it, a site warden (and ex cutter) from the FC said in few woods he had been to AOD only seemed to be affect trees that had machinery passing by (no closer than 2m reapetedly (harvester and forwarder). There was no visible damage but presumed root compaction below surface.

I then had a look in a couple of blocks we had thinned of syc 18mths or so ago and sure enough found 3 or 4 dead and dying trees all within a few feet of extraction route, all with agrilus holes! Sorry for slight derail but I thought it might be of interest, to you more learned types

 

I'm pretty sure their will be a number of factors involved which has weakened the trees to enable AOD to take hold. Certainly there is heavy compaction as well as heavy dog use.