Circular scale
addition to citrus, it occurs on many other plants. Damage symptoms Chrysomphalus aonidum has a preference for humid environments. In citrus, it tends to prefer [...] and fruit drop, and stem dieback. First signs of an infestation are dark-purple to reddish-brown or black spots with paler margins, on both surfaces of shaded [...] of Circular scale Female nymphs and adults have flat to moderately convex, circular scales up to 2 mm in diameter with a slightly raised, sub-central point