Erythrina gall wasps, mostly yellow, 6- to 8-millimeter-long invasive ... the Eurytoma wasp, a black, 2-millimeter long wasp, was collected from Tanzania, “rigorously” tested and released ...

Building a small nest of just a few paper cells, the queen must rear ... As Dr Seirian Sumner (UCL) says: "The black and yellow wasps that bother us at picnics are social wasps and we would ...