Four-spotted jewel beetle

Systematic position. The four-spotted jewel beetle (Anthaxia quadripunctata) is a member of the Coleoptera order and the Buprestidae family. These insects are widely recognized as wood-boring pests that significantly affect coniferous forest stands and ornamental evergreens across temperate regions.

Host plants. The primary hosts for this pest are various coniferous species, including spruce, pine, fir, larch, and juniper. The beetle is particularly attracted to stressed, weakened, or freshly downed trees, although dense populations can aggressively attack otherwise healthy timber and nursery stock.

Biology and life cycle. The adult beetle is small, typically measuring 5–8 mm, often displaying a metallic sheen. Their life cycle typically spans one year. During the warmer months, females oviposit in bark crevices. The larvae, which are flattened and legless, feed on the cambium and phloem layers, creating winding galleries that severely disrupt the tree's health.

Nature of damage and economic impact. The damage is caused by the larval feeding process, which effectively girdles the tree by destroying the transport vessels within the bark. This disrupts the tree's ability to move water and nutrients, resulting in premature needle chlorosis, crown dieback, and eventually the death of the tree. This makes them a major concern in silviculture.

Management and protection. Protecting stands from the four-spotted jewel beetle requires integrated forest management techniques. Key strategies involve:

• Regular forest sanitation, including the timely removal of infested or dead trees.
• Removal of wood debris and logging slash from the forest floor to eliminate breeding sites.
• Monitoring population levels using pheromone traps or visual inspections of bark integrity.
• Applying systemic insecticides in extreme cases within commercial nurseries or high-value landscapes.