Palm scale insects.
The body of an adult female widish to 2.5 mm long, covered with a waxy shield in the form of conical spikes of cream-colored. Scale insects parasitic on the underside of the leaf and suck the cell sap. The leaves have yellow spots. Infected plants are covered by "black", formed by saprophytic fungi. During the period of mass reproduction of this scale insects can pose a serious threat to plants. Control measures. When lung lesions enough to wipe plant wash with soap solution. In severe cases weekly spraying of insecticide (Fufaev, aktellik, Arriva).