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Black discolouration on leaves of P. japonica

Posted: Sun Oct 29, 2017 6:26 pm
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!
Psuedosasa japonica
Psuedosasa japonica

Re: Black discolouration on leaves of P. japonica

Posted: Sun Oct 29, 2017 7:07 pm
by Chris S
Can you wash it off with a wet cloth?

Re: Black discolouration on leaves of P. japonica

Posted: Sun Oct 29, 2017 8:27 pm
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
IMG_0467.jpg