The common pistachio psylla, Agonoscena pistaciae Burckhardt and Lauterer (Hemiptera: Psylloidea), is the key pest of cultivated pistachio trees, Pistacia vera (L.), and is distributed throughout all the pistachio-producing regionsespecially in Iran. The below figure shows the reported distribution map of this pest in the world.

The psyllid life cycle typically comprises of an egg stage, five nymphal instars and a sexually reproducing adult stage.

The nymphs and adults sucking plant sap immediately after opening the pistachio buds and causes interruption of forming the Kernels