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?
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.