Adult worker wasp are between 15 and 20mm long. They have the characteristic black and yellow patterning to the abdomen and have a black head and thorax. Wasps are colonial insects living in social groups. Over winter the queen makes her nest so it is ready to be established in spring. It continues to grow, the nest along with it, throughout the summer period. Wasps can cause harm when presented in a large numbers and locate near to humans. They can inflict painful, dangerous stings, especially to those with allergies. They can be controlled with electric insect control units or other treatments involve applying liquid insecticides, aerosols or dusts around the entrance of the nest.