What's happening to the frisias

[kev7937]

Took a little one down today and this was the stump.

 

 

Is this what's killed it or something that's happened after ?

 

I think I read/heard that there all doomed due to a virus or genetics or summit

 

Anyone clarify please

[nepia]

Hope this helps. They're dropping like flies: I took one down in Epping on Tuesday and the stump/roots were similar to yours and boy did they honk when ground.

 

Robinia pseudoacacia ?Frisia? problems / Royal Horticultural Society

[Dean Lofthouse]

I think there is a link to the very deep frosts we have had over the last few years. For three years in a row we had minus 18-20 and I noticed the decline of Robinias round about after this.

 

Whether it stresses them and weakens them to pathogens ???

Edited July 11, 2013 by Dean Lofthouse

[kev7937]

Hope this helps. They're dropping like flies: I took one down in Epping on Tuesday and the stump/roots were similar to yours and boy did they honk when ground.

 

Robinia pseudoacacia ?Frisia? problems / Royal Horticultural Society

Ta.

 

The bark came away easily on this one and it smelt like sweaty maggots

[nepia]

I'll defer to your expertise on the smell of sweaty maggots but the greenbottles were round the roots in numbers, presumably attracted by the foul stench.

[felixthelogchopper]

Does it start with die-back in the crown as have seen several street trees near me with this?

[geoff]

They don do well in overwet conditions,&we have had a lot of rain in the last year or so.

[likeitorlumpit]

I'm looking at 2 robinias locally that we planted 10-15 odd years ago. Both on clay soil. Haven't shown much growth this year. I fear they are dying. It's either prolonged cold or prolonged wet and of the two, I'd favour the prolonged wet.

Paulonias locally haven't shown any signs of damage though these are on lighter soils.

[geoff]

I'm looking at 2 robinias locally that we planted 10-15 odd years ago. Both on clay soil. Haven't shown much growth this year. I fear they are dying. It's either prolonged cold or prolonged wet and of the two, I'd favour the prolonged wet.

Paulonias locally haven't shown any signs of damage though these are on lighter soils.

 

As you know, the clay soil will hold the water up in the topsoil, & in the soil surrounding the roots, in gravel or well drained ground it is less of a problem.

[felixthelogchopper]

The street trees that I am thinking of are on clay soil towards the bottom a hill so waterlogging would likely be the cause.