The leaves on my camellia have a sooty deposit. It will not wash off. Any ideas what it is and how can I get rid of it?
Certified GKH Gardening Expert
This is called sooty mold, which more often than not is brought about by some type of pest, like aphid or mealy bug. I would recommend neem oil. We have found it to be very effective against these kinds of pests and will also help treat the sooty mold. These articles will explain more: https://www.gardeningknowhow.com/ornamental/flowers/camellia/sooty-mold-on-camellia.htm, https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm