Scoliid wasps are dark in color, often metalic, relatively large, robust, slightly hairy insects with light yellow spots or other markings. One of the most common Scoliid wasps in North Carolina is Scolia dubia. It is sometimes referred to as the blue-winged wasp. The adult is over one-half inch long with black antennae and a shiny black head, thorax and fore abdomen. About midway along the abdomen are two yellow spots (one on each side). These may appear as a band across the abdomen when the wasp is flying. The latter portion of the abdomen is brownish and somewhat fuzzy. The wings are dark blue.
These wasps, therefore, are very important natural agents in the control of green June beetle grubs in the soil. Adult Scoliid wasps feed on nectar and pollen of flowers. They will not sting unless greatly aggravated or captured in the hands. In early August, the wasps often rest on plants but later they burrow into the soil to spend the night. Scoliid wasps are often noticed flying just a few inches above lawns infested with grubs in a loose figure-eight pattern. Sometimes these wasps are quite abundant and conspicuous as they fly their mating dances. After mating, females spend more time digging for grubs and flying wasps are not as noticeable.
Recommendations of specific chemicals are based upon information on the manufacturer's label and performance in a limited number of trials. Because environmental conditions and methods of application by growers may vary widely, performance of the chemical will not always conform to the safety and pest control standards indicated by experimental data.
Recommendations for the use of chemicals are included in this publication as a convenience to the reader. The use of brand names and any mention or listing of commercial products or services in this publication does not imply endorsement by the North Carolina Cooperative Extension Service nor discrimination against similar products or services not mentioned. Individuals who use chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label. Be sure to obtain current information about usage and examine a current product label before applying any chemical.
For assistance, contact your county North Carolina Cooperative Extension Service agent. .
Published by North Carolina Cooperative Extension ServiceDistributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age, or disability. North Carolina State University at Raleigh, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.
Prepared by: R. L. Brandenburg & J. R. Baker, Extension Entomologists
Photos by J.R. Baker and Mike Wilder
ENT/ort-12 June 1994 (Revised April 2000)
Web page last reviewed January, 2010 by the webperson.