The lovebug, (Plecia nearctica), is one species of insect that I think everyone in Florida knows and can identify. But, do you know ABOUT this species? There is a lot of misinformation about this species. Add to that, apart from the “flights” that occur, most know nothing else about the natural history of this species.
Let’s start with the one huge myth about this species. they are NOT a man-made insect, created in a lab at the University of Florida. This is a pervasive myth that has circulated for decades. They are a non-native species in Florida. The first time they were documented in Florida was 1947. They are found across the gulf coast and as far north as North Carolina.
In Florida, lovebugs can be found throughout the year. But, there are 2 big “flights” of lovebugs, when they occur in huge numbers across their range. As many already know, the first flight occurs in late spring in the months of April and May. The second flight occurs in late summer in the months of August and September.
The lovebug has some interesting reproduction behavior. When females emerge from the ground, they are met by swarms of males. The male will clasp a female in the air and the two will fall to the ground. When the males first begin to couple, the male and female are facing the same direction. Then, the male turns 180 degrees and remains that way for the duration of mating.
Large females lay an average of 350 eggs before they die. Adult lovebugs have a short lifespan with females living up to 7 days and males up to 5 days. The eggs hatch in 2 to 4 days. The larva feeds on decomposing vegetation in moist, grassy areas such as pastures. In this way, they are extremely helpful in converting decaying vegetative matter into organic matter.
The adults feed on the nectar of numerous species, particularly sweet clover, Brazilian pepper, and the goldenrod seen in these photos.
There are few predators of the adult stage of lovebug as their slightly acidic insides make them unpalatable. The larva is food for birds such as robins and quail as well as spiders, earwigs, and other insect predators.
They do not bite or sting, but they are considered a pest species. The huge flights often occur near roadways and interstates (think of all the moist grass of cow pastures and roadsides which is a wonderful home for larva). It also appears that the bugs are drawn to the exhaust of cars. It has been proposed that the chemicals in car exhaust, aldehydes and formaldehydes, are similar to the chemicals released by decaying organic matter. This means that lovebugs think they are hovering over a great spot to lay their eggs. Older car paints used to be damaged by the acidic internal organs of the lovebug, however, they do not have the same effect on new cars. Lovebugs can be very difficult to remove from the fronts of cars after the bodies dry and can clog radiators.
Photo Credit: Andy Waldo