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Fri, Jun 22, 12 at 16:37
| are there certain types of soils (around the plant at ground level) like manure or compost that cause more black spot and other diseases or the soil type doesn't matter? |
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| I'd say no, assuming the plant is well-nourished. Once black spot is established on a plant, apparently it stays there permanently. Spores are released from spots on the leaves and on the bark, the latter over-wintering even in severe climates. Spores germinate according to temperature and moisture. The soil has no role in these processes. Infected fallen leaves play only a secondary role, and the disease does not depend on them. It's possible that using an organic mulch as opposed to bare soil could have some slight effect on the infected fallen leaves, but almost everyone aklready uses an organic mulch. I have heard anecdotal claims that a particular mulch makes a big difference, but I don't believe them. |
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