As the days lengthen and Scotland shakes off its winter chill, late spring and early summer bring more than just blooming bluebells and warmer evenings. From May through July, the country enters woodworm flight season — the critical period when adult wood-boring beetles emerge from timber to mate and lay eggs.
The most common culprit is the Common Furniture Beetle (Anobium punctatum), though Deathwatch and House Longhorn beetles also appear in certain areas. During this flight season, you may spot small, round exit holes (1–2mm) in floorboards, roof timbers, furniture, or joists, often accompanied by tiny piles of fresh “frass” (bore dust) resembling fine sawdust or coffee grounds. On warm evenings, the adult beetles — small, reddish-brown, and about 3–5mm long — take flight in search of new wooden hosts.
Scotland’s cooler, damper climate can extend the larval stage inside wood for several years, but rising temperatures in May and June trigger the final metamorphosis. Older properties, especially those with untreated softwood timbers in lofts, cellars, or extensions, are most at risk. Humidity and poor ventilation accelerate the problem.
What should you do?
• Inspect accessible timbers for fresh holes and dust.
• Consider professional surveys if you spot activity.
• Early treatment with appropriate insecticides or professional fumigation can prevent major structural damage.
Don’t let these silent invaders spoil your summer. A little vigilance during woodworm season can save thousands in repairs later.
