Why they are Neutral
Both adults and nymphs are sap-suckers, tending to gather in large numbers.
They cause leaves to drop, the stems die back and the plant stops flowering and seeding. In the case of lantana, it halts the spreading of the plants.
There is a debate about these bugs becoming a problem if they transfer to related plants. Duranta (particularly Duranta Geisha Girl) and fiddlewood may be affected by their introduction. These trees could die if the bugs are not treated.
In a trial study in South Africa they preferred lemon verbena to the lantana.
Since being introduced their population has steadily increased.
They secrete honeydew which will cause sooty mould.