We planted a Purpleleaf Sandcherry three springs ago. Every summer since
then it develops black (or dark) spots on the leaves. The leaves then turn
to a pale red/yellowish and green colour. It's happened again this spring,
but very early, right after it flowered. A local store recommended a
fungicide last year, which we applied with no results. I've reapplied again
last week, but it's getting worse.
Is there something I can do. It is planted at the side of the front porch,
with sun most of the day. The downspout is near by, but there never appears
to be excess water.
Any help would be great.
You don't mention where you are, however Michael Dirr notes that 'All P. X
CISTENA types in Zone 7b and 8 struggle and are almost defoliated by late
summer. They are much better adapted in the northern climes.'
It sounds like blackspot, which roses get, but I don't know if sandcherries are
susceptible. But it does sound like some kind of fungus. If so, you have to
remove all the infected leaves--the fungicide won't help what's already
infected, they just help prevent further infection. Blackspot thrives in damp
conditions, but again, I don't know if that's what you have.
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