Eyed click beetle

The genus Alaus belongs to the family Elateridae, commonly known as click beetles. These beetles are easily recognized by the spots on their thorax that resemble eyes and their ability to jump with a loud clicking sound. While many click beetles are agricultural pests, Alaus species are often associated with decaying wood in forests and mature orchards.

These insects primarily target tree species, both deciduous and coniferous. The larvae, often called wireworms, generally inhabit decaying logs or hollow trunks. Unlike some of their relatives that feed on roots, Alaus larvae focus on feeding on rotting organic matter, though they may incidentally damage the healthy wood adjacent to decayed areas.

The biological development of Alaus beetles includes metamorphosis through egg, larva, pupa, and adult stages. The larval stage is exceptionally long, lasting several years as they grow slowly within their woody environment. Once mature, they pupate within the wood or the soil near the base of the host tree, eventually emerging as adults to mate and lay eggs.

The damage caused by Alaus is typically structural and opportunistic. By tunneling into decaying wood, they can accelerate the decomposition of weakened branches. The primary harm arises when their presence facilitates secondary infections from fungi or rot, which can eventually impact the overall health and structural integrity of the tree if left unmanaged.

Effective management and protection strategies include:

• Sanitary maintenance of the orchard to remove old stumps and rotting logs.
• Pruning and proper wound dressing of tree limbs to prevent rot.
• Monitoring the orchard health to prevent general decay.
• Encouraging biological control agents, such as birds and beneficial predatory insects.