Elaeagnus sucker, or psyllid, is a species of insect closely related to aphids. They feed in the same way, by sucking the sap from plant leaves. They are also referred to as 'jumping plant lice'; because they have long hind legs that they used to jump from leaf to leaf, similar to a leafhopper. These suckers are an invasive species which reached UK shores in 2002. Following their arrival, there were huge population bouts, and now these insects are widespread across Britain. Today, these insects are less common than once thought, which suggests natural enemies have been keeping them level.