Are these spots on the leaves caused by a fungus or a nutrient deficiency?
Nutrient deficiencies over the long term can lead to disease and fungal outbreaks. Necrotic lesions on the leaf surfaces are usually a sign of a nutrient deficiency. Try feeding with a general all purpose fertilizer and see if the problem stops spreading to other areas of the plant. Necrotic leaf tissue won’t recover, remove any leaves with more than 50% damage to avoid fungal problems. You should also make sure that you don’t have a problem with fungus gnats eating the fine root hairs that can lead to root rot in sever cases which can also cause necrotic areas on the leaf surface to develop. Treat fungus gnat outbreaks by mixing 3 tsp of gnatrol per gallon of water, let sit for at least 24 hours, and then water plants with the mixture for the next week.
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