Lovebugs - Department of Entomology at Texas A&M University - Extension Publications
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EEE-00025
May 2005

Lovebugs

J. A. Jackman
Professor and Extension Entomologist

Introduction
Lovebugs, Plecia nearctica Hardy, are black colored flies with a reddish-orange thorax. They are in the family Bibionidae or March flies and like all true flies they have one pair of wings as adults. The common name "lovebugs" has been given to these flies because they often fly while still coupled during mating. Adult lovebugs emerge after rainy periods and can be abundant locally. They are a nuisance when smashed on car windshields and headlights or when they interfere with house painting and other human activities.

Description
Adult lovebugs are about 3/8-inch long with a pair of smoky colored wings. Larvae or maggots grow to about 3/8 inch long and are slate-gray in color with dark heads. Other March flies in Texas are generally black with clear wings and are seldom abundant, even locally. All March flies are weak fliers.

Life Cycle
Adult lovebugs typically emerge in large numbers primarily in the spring (May) and autumn (September). The autumn emergence is usually larger. The female is larger than the male and the female will fly off dragging the attached male. Although individual females live for only a week or so, adult flight activity lasts for a period of about 4 or more weeks as new adults emerge.
Eggs are deposited in swampy areas and ditches. The resulting larvae develop through several stages (instars) reaching a length of about 3/8 inch. Larvae are seldom encountered but they can be found in the soil in moist edges along waterways rich in organic matter. Larvae sometimes can be found in well-watered lawns with an accumulation of thatch. Pupae are found in the soil and emerge as adults in about 8 days.

Biology
Lovebug larvae develop in moist habitats high in organic matter such as ditches and swampy areas. Larvae have chewing mouthparts and feed on decomposing organic matter and sometimes plant roots. They are harmless as immatures and are actually beneficial by decomposing plant tissues.
Adults emerge during specific times of the year usually after the soil has been saturated for prolonged periods. Adults fly mainly during daylight hours and spend time sipping nectar from flowers and mating. They are naturally attracted to open or semi-open areas such as roadways and ditches often in areas with woods. They sometimes accumulate around gas stations, fresh tar and wet paint. It is generally believed that car exhaust and/or gasoline contains some attractants for these flies. They also appear to be attracted more to white or light colored cars than dark ones.

Damage
Both adult and immature lovebugs are considered medically harmless. However, the presence of lovebugs in large numbers can be quite a nuisance. Large numbers of lovebugs in flight over roadways can cause bug-splattered windows and clogged radiator grills. Insects splattered on windshields can obscure vision, and if the dead insects are not cleaned off promptly, they can ruin the finish on a car. Clogged radiators can cause engine overheating.

Management
There is no easy solution to lovebug problems. It may be necessary to learn to cope with lovebugs with a variety of methods for a few weeks each year. The following facts and suggestions will help:

Myth Busting
A persistent rumor exists that Texas A&M and other universities have imported lovebugs for research on fly and mosquito control. Lovebugs are native Texas insects that were first described by Hardy in 1940 from Galveston, Texas. They occur naturally all along the Gulf Coast from Texas to Florida.

Other useful information sources
University of Florida - Lovebugs
University of Georgia - Lovebugs

This publication replaces UC - 009.

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Images

Lovebugs mating, Plecia nearctica Hardy.
Click on image to enlarge.