When are biting midges most active?

When are biting midges most active?

Biting midges have distinct daily and seasonal activity patterns. Understanding these patterns helps with precise control.

Daily activity periods

1. Dawn — 1-2 hours around sunrise is the first peak activity period; they emerge in groups to feed.
2. Dusk — around sunset is the second peak; this is when they are most active.
3. Daytime — some species (e.g., *Leptoconops*) are also active during the day, especially on cloudy days.
4. Night — most midge species rest at night and are inactive.

Seasonal patterns

• Midges are most active in summer (June-September), breeding fastest at 25-30°C with humidity above 70%.
• Activity decreases in spring and autumn; they are mostly inactive in winter.
• In warm, damp indoor environments, however, midges may breed year-round without interruption.

Targeted control strategies

• Keep windows tightly screened during peak activity periods (dawn and dusk).
• At dusk, spray dinotefuran-containing household insecticide on balconies and window sills in advance — mass killing is most effective when they are active.
• Increase indoor dehumidification in summer to avoid damp conditions.
• If ventilation is needed at dusk, install fine-mesh screens (40 mesh or finer) — ordinary screens cannot block midges.
• Avoid outdoor activities during dawn and dusk peak periods.