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Blackspot on roses near tree
Hi Allegra,
Nope, it's not cercospora. It's definitely blackspot. I think it's just a problem with that Kentucky Derby. The spotting on the other roses is minor and probably just because I'm not aggressive enough on the fungicides. But the K.D. is almost a lost cause, spotwise. If the spot wasn't so crowded I'd dig it up and plant something else. But considering how crummy a spot it is, I guess I will just live with the spots. At least the blooms are nice. JimS. "Allegra" wrote in message et... "JimS." wrote Does being near or under a tree make blackspot worse? My Kentucky Derby is always COVERED with blackspot, and no amount of anything will keep it from looking pitiful. The tree is a crabapple, I think. I have 3 other roses under the same tree (it doesn't block their sun) and they all have minor blackspot too, though not as much. I wonder if the tree makes it worse? Or weeds? Does anyone else have a blackspot problem with Kentucky Derby? JimS. Hello Jim, Are you sure it is blackspot and not cercospora? The trees in the park around us have a constant strain of cercospora and naturally everything including our roses are spotted with it. Actually the two roses under our crabapple Brandywine are clean as whistles. Check this link for the cercospora info. http://www.aces.edu/department/extco...5/anr-505.html Allegra |
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