Citrus black fly

The adult, when it first emerges, has a pale-yellow head, whitish legs and reddish-brown eyes. Soon afterwards, it darkens, developing a fine covering of waxy powder which gives it a slate-blue appearance.The wings are angled and held in a tented fashion. The whole lifecycle takes from 45 to 130 days, depending largely on the temperature
Damage: The principal harm done by the citrus blackfly is the sucking of the tree's sap, which deprives it of both water and nutrients. The excretion of honeydew coats the leaf surfaces and encourages the growth of sooty mold. This can severely impair both leaf respiration and photosynthesis. The combination of all these factors causes a decline in the health and vigour of the tree and a reduction in fruit yield.