Black discolouration on leaves of P. japonica

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iain
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Black discolouration on leaves of P. japonica

Post by iain »

Could anybody tell me what this is, what causes it, and if I need to take any action. I would describe it as a black fungus, but I saw no aphids on the leaves. The plant was planted last year as a small division, in a raised bed, and has been dwarfed, somewhat unexpectedly, by the vigourous new growth of the adjacent plant. Therefore, could it be stress-related, as you sometimes see with conjested shrubs? Thanks in advance!
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Chris S
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Re: Black discolouration on leaves of P. japonica

Post by Chris S »

Can you wash it off with a wet cloth?
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iain
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Re: Black discolouration on leaves of P. japonica

Post by iain »

iain wrote:but I saw no aphids on the leaves.
Oops! I just brought a leaf into the house with the intention of wiping it with a cloth and found the underside crawling with aphids!
Thanks for your response, Chris, and for your website, which has the most detailed descriptions. http://bamboo-identification.co.uk/html ... tml#aphids
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