Hello. The symptoms in the pictures are similar to those caused by a disease (bacterial or fungal). In this case, it is recommended to remove the affected leaves and apply a treatment with a fungicide such as , in a dose of 20 g/10 L water. Spray () the solution as finely as possible so that it is evenly distributed on the upper and underside part of the leaves.
10-12 days after finishing the fungicide treatment, in order to increase the resistance of the plant to various diseases, you can consider using a fertilizer such as , applied directly by spraying, according to the recommendations on the label.
It is also advisable to keep the environmental conditions in the space constant and to respect the care requirements specific to these species, also detailed in our article (Mango, plant care and growing guide). Additionally, it is indicated to keep an eye on the plant’s development for a while, and if any additional symptoms manifest, please let us know by sending a message with images.