Black-tailed longhorn beetle

The black-tailed longhorn beetle (Stenurella melanura) belongs to the order Coleoptera and the family Cerambycidae. While adult beetles are often seen visiting flowers to feed on pollen, their larvae are recognized as wood-boring pests that target various deciduous and fruit-bearing trees.

These beetles prefer to lay eggs on stressed, weakened, or dying trees. Common hosts include orchard staples such as apple, pear, and plum trees. Because the beetles target trees that are already vulnerable, they often accelerate the decline of existing horticultural plantings.

The biological cycle involves the larvae burrowing beneath the bark. They feed on the cambium and sapwood, creating extensive galleries that disrupt the vascular system of the tree. This feeding activity typically spans one to two years before the insect reaches the adult stage, causing cumulative damage over time.

The primary symptom of an infestation is a decline in tree vigor, characterized by stunted growth, yellowing leaves, and thinning canopies. If left unchecked, the structural integrity of the branches may be compromised, and the tree may become an entry point for secondary wood-rotting fungi and other pests.

Effective management focuses on promoting tree health. Cultural practices are essential: maintaining optimal soil fertility, proper irrigation, and pruning damaged or dead wood. Removing and destroying infested material helps reduce the population density in the area, preventing the further spread of the beetle to healthy trees.