The sap-sucking insects suck the sap from the underside of the leaves. Affected leaves turn yellow and become sunken and eventually dry up and fall off. Sometimes the leaves also turn black. For its control, apply 5 ml Kilmite and 5-7 gm per 15 liters of water. Greentara or 15-20 ml Victor and 10 g. Mix it and sprinkle it. After 6-7 days, 30 g per 15 liters of water. Dissolve clean or power and spray it.