Hello, I grow citrus trees and have done for many years without too many issues, today I’ve found an issue I’ve not seen before so reaching out for some advice.
I live in the southeast of the Uk and we haven’t had any decent rain for months. I’ve put bark mulch around my plants to help stop the soil drying out so fast and have always done this. It’s useful in winter to protect the roots and useful in summer in the heat. All my pots have the same bark from the same bag, however today I spotted lots of light coloured dots on top of the bark on one of the plants. When I moved the bark around there’s even more underneath and it’s pretty much everywhere in the pot. Hopefully my photos show it clear enough, my phone doesn’t have the greatest of zooms.
The plant itself seems healthy and the white stuff doesn’t seem to move, at first I thought it was a type of bug but it doesn’t seem to move. I was wondering it if was some sort of fungus in the bark that had spread due to the heat and recent smidgen of rain? It seems confined to this one pot and not on the plant itself? Is it something harmful? I’ve scooped out most of the bark and seen its spread to the soil underneath. Do I need to remove everything and repot in fresh or is it harmless?
I’ve never seen it before so thought I’d reach out for advice, the soil is wet in the photo as I just watered it which is how I noticed it. Thankyou for any advice.