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Is this Black Spot?


 
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Yorky
Rank attained: Silver Birch Tree
Rank attained: Silver Birch Tree


Joined: 17 Apr 2007
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PostPosted: Thu Apr 23, 2009 6:00 pm    Post subject: Is this Black Spot? Reply with quote

If so, can it be treated organically? I've read that a 1:1 ratio of milk and water can be sprayed . Would this be suitable for the stem with no foliage in the picture? How often should I spray?

There are several bushes in the bed and most are affected to varying degrees, the worst being the heavily spotted stem.

http://i238.photobucket.com/albums/ff250/Kilnadrain/P1050254.jpg
http://i238.photobucket.com/albums/ff250/Kilnadrain/P1050256.jpg
http://i238.photobucket.com/albums/ff250/Kilnadrain/P1050257.jpg
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Belfast
Rank attained: Sessile Oak Tree
Rank attained: Sessile Oak Tree


Joined: 23 Apr 2009
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PostPosted: Sun May 17, 2009 7:00 pm    Post subject: Reply with quote

try here
Blackspot on roses (Diplocarpon rosae)
http://www.gardenplansireland.com/forum/about1595.html
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Liparis
Rank attained: Orchard owner


Joined: 23 Sep 2007
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PostPosted: Sun May 17, 2009 9:04 pm    Post subject: Reply with quote

Chimney soot. Not easy to get now. Chimney sweeps used to leave the soot in a heap in your garden after cleaning your chimney, you spread it in the rose-bed. With the advent of smokless zones, blackspot on roses became rife.
Bill.

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michael brenock
Rank attained: Chlorophyll for blood


Joined: 12 Aug 2008
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PostPosted: Mon May 18, 2009 10:23 am    Post subject: Reply with quote

the nitrous compounds present in soot killed off the spores of the overwintered black spot on dead leaves on ground or at least reduced the numbers and viability of the spores. it helps to rake off the dead leaves under the bushes in winter and early spring as this reduces the sources of infection. Follow this with a mulch of garden compost and the extra feed with the smothering effect of the mulch will go a long way to reduce black spot. varieties vary in their resistance to black spot.
michael brenock horticultural advisor (retired)
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