Help Needed

[pcs]

Can anyone tell me the problem with this Mountain Ash?

 

[pcs]

here's another

 

[pcs]

and another

 

[rborist1]

:Eye:

 

[John Paul Sanborn]

I would say it is one of the many fungal or bacterial cankers that Sorbus gets when used in warm moist zones.

It is a zone 3 hardy plant with the word Mountain in its name.

They do the same thing here in MKE with our zone 4-5 lake humid weather. If they live 10 years we are lucky.

 

[John Paul Sanborn]

Craig, the fungus is saprophytic, not necrotic.

scalled and mechanical damage could have something to do with adding stress, they are higher lattitude native, though the literature says full sun.

 

[rborist1]

:Eye:

 

[NickfromWI]

Are nursery trees more prone to sunscald because they lollipop-trim them?

The lower branches shade the trunk and provide insulation...no matter how tiny they are. The nurseries should be leaving them on for much longer, no?

 

[Ax-man]

Sorbus is in the rose family. My guess Fire Blight.

 

[Guy Meilleur]

Originally posted by NickfromWI
Are nursery trees more prone to sunscald because they lollipop-trim them?
Absolutely.

The lower branches shade the trunk and provide insulation...no matter how tiny they are. The nurseries should be leaving them on for much longer, no?

Absolutely. lower branches would also hold flowers and berries, which are often why the plant is bought in the first place.
No sign of fireblight.
Rosaceous plants are thin-barked. Craig, the fungus feeds on on dead wood (saprophytic), which means fungus is not the problem.
No charge for translation--this time!!

 

[ROLLACOSTA]

Originally posted by Ax-man
Sorbus is in the rose family. My guess Fire Blight.

im with you on this one ..and ive just double checked my book..i'll
go FIRE BLIGHT ...

 

[John Paul Sanborn]

The get Nectria and a bunch of other stuff too in my neck of the woods.

from the UConn page

Liabilities

* stress predisposes the plant to disease and insect problems
* very susceptible to borers
* frequently develops fire blight
* other insect and disease pests include cankers, rusts, aphids, sawflies, and scales
* often short-lived in the landscape

I've seen sawfly defoliate them in a few days.

O remeber them being greener then these though. Mybe I only saw the earlier instars.

 

[Ax-man]

If memory serves me right, there are two species of Mountain Ash . Without digging the Latin out on it, there is the European variety which was very popular, the other species was the Korean. Which one is this one ??? In this picture the bark is not the right color for the European Mountain Ash.

Larry

 

[John Paul Sanborn]

I've read that there are around 40 different Sorbus, with those 2 being the most common landscape species.

It is also known as Whitebeam in Europe.