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My Rowan tree has got a disease that I would like some help in identifying if possible? I think that it is probably leaf spot or fire blight but I am not sure. The leaves have been developing brown spots and some defoliation has started. The bark does not seem particularly bad and I cannot see any signs of honey fungus when I cut a little bark away. I have cut away a couple of branches and there is some dark stains inside the branches. If it is leaf spot does anyone know how to tell if this is caused by bacteria or fungus? I would like to treat the tree if it can be saved but I need to identify the exact problem first.
Well, that's not fire blight, Biology Geek. Fire blight really does make apple trees and rose bushes look like some b_____d has been round with a blowtorch. If your car hasn't been keyed, blame fire blight.
It's also not as spotty as I'd expect from leaf spot.
After a browse around, I see fire blight, canker, leaf spot and silverleaf as the main diseases of rowan, so go with leaf spot for a guess and take a clean saw to that branch. Start two thicknesses out from the trunk. Cut upwards from below the branch to 1/3 of its thickness, then move one branch thickness further out and cut downwards. The branch'll split from cut to cut and drop, and then you can saw off the stump nearer the trunk to leave a clean face without having all that weight leaning on it.
If you find that black staining where you cut, clean the saw blade and try again further down.
Burn the infected material.
Thanks for your advice Charlie November. My only concern is that it has been infected a while, since I have only recently moved to this property and noticed it. There may be nothing left that is not infected.
I wish I could be of help as it might thow some light on my problem. My Rowan which has yellow berries has been ok untill this year when it has developed dropsy, all the leaves are dropping off one at a time. We inherited it some two years ago so can't be sure of its age but I think about 15-17 years going by the age of the property. We are in a very clay laden area in South Devon.