If you could flip yourself off your back and hurl four times your body length into the air, would you? If you were a Eyed Elater, of course you would! And you would do it with a very loud "click", because you would want to get away from whatever turned you on your back. Most likely, that culprit would be one of your personal predators and you would want to avoid being its lunch.
As fascinating as this acrobatic trick may be, why would you, as an the adult form of Alaus oculatus, a species of click beetle, be of interest to a gardener? Actually, the adult click beetle isn't of much significance to gardeners, but its larval form, better known as a wireworm, is.
"Wireworm" is the name given to most larvae of the very large click beetle family. Many of these larvae are notorious pests that consume the roots of cereal crops, causing serious damage. Unlike its many cousins, the Eyed Elater larva is ferocious meat-eater that dines on many other noxious larvae, including those of wood-boring beetles, flies, and other undesirables.
Found under logs and other dark, damp places, the Alaus oculatus larva looks like a stocky, yellowish-brown, segmented worm. It has a flat, dark brown rectangular head that ends in 2 powerful jaws. The jaws, which resemble small crab legs, are used to disable and dismember prey. An individual is about 2 inches long. It looks rather dangerous at the posterior end, too. The 10th segment has 2 anal hooks, 10-12 spines, and setae (hairs) in front of the anus. The Eyed Elater spends most of its life in the larval form, perhaps as long as 2-5 years. All the longer to do its good deeds!
The grown beetle is actually rather attractive. It is black, with 2 large false eyes on the back of its 1˝ inch body. There is a spine on its poststernum that can be snapped into a corresponding notch on the mesosternum. Then, the beetle flexes its back to "pop" itself as much as 6 inches into the air. It is the release of the spine from the notch that provides the sound effect.
Adults probably feed on nectar, if they feed at all. The only hazard grown critters might present to us is to startle us. They are attracted to light and, in hot weather, may enter a house through an opened window or door at night.
You want to remember the beneficial effect of its offspring before stepping on one. In my mind, it would be more ecologically sound to gently pick the little fellow up and take it back outside, where you could, in the interest of "scientific observation", lay it on its back and watch it hurtle itself through the air.
Only once, though; none of us wants to be accused of Eyed Elater abuse!
Beneficials in the Garden & Landscape is an Earth-KindTM program coordinated through Extension Horticulture at Texas A&M University. Earth-Kind uses research-proven techniques to provide maximum gardening and landscape enjoyment while preserving and protecting our environment.
This web site is maintained by Master Gardener Laura Bellmore, under the direction of William M. Johnson, Ph.D., County Extension Agent-Horticulture & Master Gardener Program Coordinator.
All digital photographs are the property of the Galveston County Master Gardener Association, Inc. (GCMGA) © 2002-2006 GCMGA - All Rights Reserved.