Hello! The symptoms can occur due to several factors, such as: improper watering, transplanting, low air humidity.
Excessive watering/persistent moisture in the substrate can lead to root rot.
In the future, it is recommended to water the plant moderately, allowing the substrate to dry out before watering and removing any excess from the pot after watering.
For the time being, it is recommended to remove the affected leaves, check the condition of the stem (if it is brown or has a soft texture) and use a broad-spectrum fungicide such as , applied by spraying, in a dose of 10 ml/10 l water. It is recommended to carry out two treatments 7 days apart. It is also advisable to apply a fertilizer to help the plant regenerate, such as , applied by watering in a dose of 2 ml/ 1 l water, according to the information on the label.
Additionally, being a tropical plant, it requires higher atmospheric humidity. In this regard, you can periodically spray the plant with non-chlorinated water, kept at room temperature, or you can place the pot on a layer of permanently damp gravel.