Indication of over-fertilization
Depending on the size of the plant, the location and the season, this will be A leaf every two to eight weeks a houseplant fertilizer. Over-fertilization, ergo an excessive supply of nutrients, becomes noticeable over time through brown spots on the leaves. In such a case, repot the plant in fresh substrate and reduce the amount of fertilizer.
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Pest infestation
Especially if the plant is too dry or the humidity is too low, the single sheet gets initially brown leaf tips. In addition, the weakened plant can later be caused by pests such as Spider mites or the Red spider be infested. They love dry, warm air and feed on the nutritious leaf sap. Piercing the leaf veins creates small, brown spots. Later the whole leaf changes color and eventually dies.
How to get rid of spider mites & Co.
Spider mites & Co. do not like high humidity, which is why you can prevent and combat an infestation by regularly spraying the plant. However, only use decalcified water or soft rainwater, which should also be warmed to room temperature.
Leaf spot disease
Are the spots on the leaves dark brown with a lighter edge? light, ring-shaped and crumbly - both variants are possible - then it is very likely about leaf spot disease. The lower leaves in particular also typically dry up. To fight the disease, you need to remove the infected leaves and dispose of them with household waste. In severe cases, special preparations from specialist retailers help, whereby you should primarily rely on organic quality - all other agents should not be used in living spaces.
Tips
So that your single sheet feels comfortable, take care of it a suitable location, fertilize plant regularly and keep both the air and the substrate evenly moist. Avoid waterlogging, however.