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Fungus on Acer Trees

I have some beautiful acer trees which I have in very large pots around my garden pond. Unfortunately this year they are developing a white fungus on the trunks of these trees. Can anyone tell me why this should be and how to treat? This year we have introduced an irrigation watering system could this be the cause?
Thank you
Jan

Re: Fungus on Acer Trees

Obviously I cant be certain but it could be Coral spot.

Here is a bit about it http://www.thegardenersalmanac.co.uk/Data/Coral%20spot/Coral%20spot.htm plus if needs be you could do a google on the subject and come up with a bit more detail.

Re: Fungus on Acer Trees

Hi there Jan. Acers are notorious for getting coral spot- even though it can be a whitish spot to begin with. Just on the off chance, it isn't wooly aphid. I've seen them this year in huge numbers surrounding stems and they can look like a fungus. If you rub it will come off quite easily and squeeze it between your fingers it'll squish.

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