Bleeding canker English walnut

[Ben Ballard]

 

This is a first for me in the same area i felled a few horsechestnuts with pseudomonas syringae in the last couple years ,but never seen bleeding canker on walnut ,this year we had sudden leaf drop and a lot of the buds dried ,when for the pseudo as i have always been under the impression walnuts were resilient to phytophthora,a bit of decay on main stem from a old stem and probly hollow but should be able to salvage something out of it with the mill

[Tony Croft aka hamadryad]

nah, just a dose of the mellea and brought about during a severe drought stress situation.

[Ben Ballard]

i had a look at the other walnuts on the park and they are doing fine didnt think it was the drought as thought they could cope with warmer weather but hope your right hama and it is that rarther than having bleedingcanker and lose a load more trees

[Tony Croft aka hamadryad]

im right mate, trust in the hama! theres bark on the deck and disruptions at low levels, with any luck this is just one weakened stressed tree being done by the Kim and Aggy of the arboreal world.

[Fungus]

i had a look at the other walnuts on the park and they are doing fine didnt think it was the drought as thought they could cope with warmer weather but hope your right hama and it is that rather than having bleedingcanker and lose a load more trees

 

Ben,

If it is Armillaria, be aware of the risk of spreading through root-root contact by rhizomorphs growing up to one metre a year in a straight line towards damaged roots "attracted" by regenerating roottips secreting growth hormones.

Edited August 15, 2011 by Fungus

[Ben Ballard]

cheers hama i will look out for some fruiting

[Ben Ballard]

Thanckyou for the advice Gerrit it is in a ornanental setting the problem we have is alot of new plantings 1-20years old and a big oak near by that has always looked illin health 50 percent of the chestnuts in the same area have gone

[Tony Croft aka hamadryad]

cheers hama i will look out for some fruiting

 

this is a common mistake, Armillaria sp rarely fruit IME, prefering to travel underground rather than with spores by air, the only times ive seen it fruiting is in (i suspect) panic mode trying to find a new home.

 

I see very few fruiting instances compared to the other symptoms and signs like plaques and rhizomorphs.

[Tony Croft aka hamadryad]

I have heard (Glynn percival) suggest that airspading out the root crown and replacing the soil round the root crown with a 50/50 mix of sand and perlite is helpful in protecting against the Armillaria sp

[Ben Ballard]

sounds a good way to deal with it tony is there any species that can cope well with it or will it just clean up any trees that are under stress?