Holzwurms, also known as woodworms or wood-boring insects, are small pests that burrow into wooden structures and lay their eggs there. They are harmful because their larvae feed on the wood, creating tunnels and galleries as they go. Over time, this can weaken the structural integrity of the wood, making it prone to breakage and damage. If left unchecked, holzwurm infestations can lead to extensive and costly repairs. Therefore, understanding holzwurms and their harmful nature is essential for protecting your wooden assets.