Black patches on bonsai & aphids

4 months ago
last modified: 4 months ago

Hey there! I’ve had an aphid issue with my Fukien Tea tree recently. I’ve tried to control it with a wash with neem oil and it seems like it is hopefully working. However, the leaves have developed black/brown patches on them, and there’s more everyday. They’re not spots, but rather quite large patches. What is causing this and how do I address it? Thanks in advance!