Firebug

Pyrrhocoris apterus

1. Identification

• Common name: Firebug
• Scientific name: Pyrrhocoris apterus L.
• Order: Hemiptera
• Family: Pyrrhocoridae

2. Pest description

• Adults 8–12 mm, flattened body and red coloration with characteristic black spots.
• Reduced or absent wings (common wingless form).
• Nymphs similar to adults, but wingless and with more uniform coloration.
• Gregarious species, frequently observed in large aggregations.
• Does not have an aggressive piercing-sucking mouthpart for woody plants.

3. Main hosts

• Lime tree (main host species).
• Other shade trees may harbour aggregations.
• Feeds mainly on fallen seeds and decaying plant matter.

4. Symptoms and damage

• Generally does not cause significant damage to plants.
• May feed on fallen seeds, with no relevant impact on the tree.
• The main “damage” is of an aesthetic or nuisance nature, due to the large aggregations.
• May enter buildings for shelter, causing discomfort to occupants.

5. Biological cycle

• One generation per year.
• Adults overwinter in groups, frequently at the base of trees or in crevices.
• Oviposition in spring, with active nymphs during the summer.
• Nymphal development through several instars.
• Aggregations common in sunny, sheltered places.

6. Monitoring

• Direct observation of aggregations at the base of lime trees or on trunks.
• Checking for nymphs and adults in sunny areas.
• Recording of periods of greatest activity (spring and summer).
• Assessment of presence in buildings or areas of public circulation.
• Monitoring of shelter sites (crevices, walls, exposed roots).

7. Management measures

• Cultural: removal of fallen seeds, cleaning of plant debris and sealing of crevices in buildings to prevent entry.
• Biological: conservation of natural predators, such as spiders and small insectivores.
• Integrated protection: regular monitoring, interventions only when necessary, environmental management to reduce aggregation sites and use of physical barriers in buildings.

Bibliographic references

• EPPO Global Database – Pyrrhocoris apterus.
• CABI Invasive Species Compendium – P. apterus.
• Socha, R. et al. (1993). Biology and ecology of the firebug Pyrrhocoris apterus.
• Davranoglou, L. R. et al. (2019). Distribution and behavior of Pyrrhocoridae in urban environments.