scoliid wasps on a flower

Scoliid wasp (Scolia dubia). Photo: Ansel Oommen,

Updated: February 10, 2021

About Scoliid wasps

  • Scoliid wasps, also called digger wasps, are a type of ground nesting wasp.

  • Scoliid wasps are about 5/8 inch long, blue black, with blackish purple wings. There are two yellow stripes, one on each side of the abdomen.

  • Their bodies are fairly hairy and the back part of the abdomen is covered with reddish hairs.

  • They are generally seen flying in large numbers over lawns during the day, leaving in early evening.

  • Scoliids are beneficial wasps parasitic on grubs. They are not aggressive and generally do not attack people. They disappear at the end of the season. 

  • Adults are often seen visiting golden rod flowers in late summer.

  • Control is not necessary or recommended