CAUTION: This information was developed for North Carolina and may not apply to other areas.
A noticeable mound of soil surrounds the burrow of each cicada killer wasp. Since colonies of burrows are common, infested lawns usually contain several mounds that can smother the grass. However, since cicada killer wasps prefer to nest in areas of sparse vegetation, it is likely that an infested turf was already unthrifty when the wasps arrived. They rarely burrow in thick, vigorous turf.
The cicada killer wasp overwinters as a larva within a cocoon 3/4 to 1 inch deep in well drained soil. Pupation occurs in the spring. The cicada killer wasp's life history has not been closely studied in North Carolina, but this wasp appears as early as the first week of June in Arkansas, but rarely before July 1 in Ohio. Emergence continues throughout the summer. The female adult feeds, mates, and digs burrows for several weeks before preying on cicadas. A vertical or slightly angled burrow 6 to 9 inches deep and 1/2 inch in diameter with broadly oval cells perpendicular to the main tunnel is excavated. The excess soil thrown out of the burrow forms a symmetrical, U-shaped mound at the entrance.
Once cells have been constructed, the search for cicada begins. Canvassing tree trunks and lower limbs, the wasp stings its prey, turns the victim on its back, straddles it, and drags it or glides with it to the burrow. Each cell is furnished with at least one cicada (sometimes two or three) and a single egg before being sealed off. Two to 3 days later the egg hatches. Depending on the number of cicadas in its cell, the larva feeds for 4 to 10 days until only the cicada's outer skin remains. During the fall, the larva spins a silken case, shrinks, and prepares to overwinter. Only one generation occurs per year. These can generally be considered beneficial insects.
Cultural practices can prevent or eliminate the establishment of cicada killer colonies. Adequate lime and fertilizer applications accompanied by frequent watering promote a thick growth of turf and can usually eliminate a cicada killer infestation in one or two seasons. Usually the perceived need for control is based in fear rather than fact. In case of a severe infestation, chemical control may be desired to prevent or allay fears of wasp stings.
Recommendations for insecticides approved for control of these insects in
home lawns can be found under Bees and Wasps in INSECT
CONTROL IN HOME LAWNS in the NC Agricultural Chemicals Manual.
Recommendations for insecticides approved for use on sod farms, golf courses or other commercial sites can be found in COMMERCIAL TURF INSECT CONTROL in the NC Agricultural Chemicals Manual. (p.186)
For additional information on insect control and pesticide use Contact your county Cooperative Extension Center .
Interesting Links :
Professor Chuck Holliday's Cicada Killer Page
Joseph Coelho' s Cicada Killer Control Page
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.
Prepared by: James R. Baker & S. Bambara, Extension Entomologists
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.
ENT/ort-63 July 1994 (Revised) April 2002
Web page last reviewed January, 2011 by Art Vandolay .