Indoor rubber tree
Round spots on Rubber Tree leaves - what's causing this, how to treat it?
If you notice brown spots on your rubber tree, whether they’re caused by a fungal or bacterial problem, it may be difficult to manage the disease. Once you notice brown spots, a disease is already present. Remove all leaves with brown spots from plants, and also remove any dropped leaves to help break the life cycle of these diseases. If your rubber tree is in a container, repot it in sterilized potting mix and discard the contaminated soil.