White spots on the leaves of Calla may be normal. Some varieties will have white spots. Don't worry too much. But if the white spot will expand in the later stage, it may be infected with mosaic disease, which will seriously harm the normal growth of plants. When it is found, it should be treated as soon as possible, with more ventilation and more sun exposure. If the disease is serious, the leaves should be cut off and disinfected with alcohol. It is also necessary to spray Omethoate drugs to prevent and cure thoroughly, so as to avoid the next infection.
