Refugee's picture

Dutch elm disease

Observed: 29th April 2010 By: RefugeeRefugee’s reputation in PlantsRefugee’s reputation in PlantsRefugee’s reputation in PlantsRefugee’s reputation in Plants
dscf0377
dscf0377 1
dscf0377 1 2
dscf0377 1 2 3
Description:

This tree looks to me like it is either recovering from disease or the infection has been retarded by very cold weather. It is producing seed from a surviving branch and new growth from the trunk below the part that is flowering.
Is this known from previous years or is it an exception?
Would the seed be worth harvesting to attempt cultivation of a resistant variety?
The first photo is of another smaller healthy tree with better access for a close up.

Identifications
Species interactions

No interactions present.

Species with which Elm interacts

Comments

PhilT69's picture

Dutch Elm indicators -

Elm seed is not viable. Dutch Elm disease is indicated by beetle tunnels under bark which then admits a lethal fungus. Elms propagate via roots.

Phil T.

Refugee's picture

Elm seed

I feel quite strongly that the elm must at some time in evolution have produced viable seed and that few these days grow to flowering size due to disease. In the 1970s there used to be elm trees with trunks four feet wide and these would have been too old for them to have been grown from infertile timber stock. Perhaps it is a good year for them and a chance for a new outlook.
The squirrels are reaping much of the seed from these trees and the seed can be seen and feels solid in the center of the "wing" on about half of the trees i have seen. Most have only propagated from roots since the 1970s due to not getting the chance to produce seed.

Refugee