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Asprin
My very helpful gardening neighbour up the road has just popped round to see how I'm going with all my little projects and if I had any problems. I pointed out to him that my patio rose seemed like it had black spot. He said it indeed did. His answer was "you better get that an Asprin sharpish" to which I laughed thinking it was a joke. He then carried on to say dissolve a couple of Asprin (not the shiny ones) in a litre of water and use as a spray. Now is he having me on or is this some genius little trick that people use? He's given me a lot of useful advice in the past about homemade feeds and pest repellents so I'd like to think this is another of his pearls of wisdom but I've never heard of giving Asprin to plants before
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Never heard of it, but just asked Mr Google and he came up with this: http://forums.gardenweb.com/discussions/2131795/only-for-the-brave-a-blackspot-experiment-to-try
Whatever happens you must remove the affected leaves and burn them, or at least send them to the council composting centre via your green bin. That includes any fallen leaves.
Somebody on here will be able to advise you on how to treat it.
I once picked up a tip about aspirin on some website so this is nothing new. Here's the quote -
"You can revive a sickly plant with the help of a soluble asprin - this really does work - it needs to be dissolved in a pint of water and will do wonders . Asprin is salicylic acid - exactly the same as the growth hormone in plants and derived from willow bark".
It may not cure the problem directly but it makes the plant healthier and better able to resist disease. As Steve says, you do need first to remove all affected leaves and any that have fallen to the ground in order to stop the spores spreading.
I have it in my head that aspirin improves the longevity of cut roses. Someone must have told me this once and it seems to work.