Does anyone have any 'pet' methods for dealing with black spot on roses
or are the commercial sprays adequate?
I am in Scotland which has a fairly wet atmosphere so keeping the
leaves dry and not allowing the soil (where I believe the spores
'live')to splash up is pretty much a non starter. Rose is in a flower
bed so I would think mulching the soil is not really a goer, but then I
am no gardener (it's my son's garden)so wouldn't really know.

soup wrote:
Does anyone have any 'pet' methods for dealing with black spot on
roses or are the commercial sprays adequate?
I am in Scotland which has a fairly wet atmosphere so keeping the
leaves dry and not allowing the soil (where I believe the spores
'live')to splash up is pretty much a non starter. Rose is in a flower
bed so I would think mulching the soil is not really a goer, but then
I am no gardener (it's my son's garden)so wouldn't really know.
Never had it in towns in the 50s, the old smog dealt with it
marvelously, chimneys belching out hi concentrations of sulphur
dioxide. I was a young apprentice in 1954 in the chemistry laboratory of
a coal power station in Liverpool. If I remember rightly the plume down
wind of our 3 chimneys (The three sisters) generated in the centre, a
deposition of soot of approx 50 tons to the acre.
Suggest you use flowers of sulphur or a copper based fungicide.
Don

--
Bold is Brown with the People's Purse. (loosely translated from a Welsh couplet "Hael yw Hywel ar bwrs y wlad")