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As the fungus progresses, the spots grow larger and larger until they join together and the spots become more like blotches and then gradually fill the whole leaf, which will then fall off.
If you don’t catch this early and it progresses to the point of losing leaves, the copper octanoate treatment will not be strong enough and a stronger treatment will then be necessary.
To make the treatment, mix water and 3% isopropyl alcohol at a 1:1 ratio and add a small amount of baby soap or Dawn. Neem oil is an optional good idea to add to this mixture.
If you don’t want to make the mixture yourself, we sell bottles of our own treatment mixture pre-made here!
Before treating, make sure to isolate the affected plant and collect all of the dead leaves (including the ones that have fallen off) and dispose of them away from any of your plants - the dead leaves are covered in spores looking to propagate.
Spray down the entire plant with your treatment and then continue to monitor its health. It may take a few applications until it’s all the way back on its feet, but you can help it along by making sure you don’t miss any spots while you’re spraying it down. While it’s recovering, remove any new brown or yellow areas as you notice them.