Insecta, Coleoptera, Scolytidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Extremely polyphagous, European shot-hole borer attacks for preference apple, pear, apricot but also develops on peach, cherry, sweet chestnut, plum as well as on various forest trees.
- Adult: hibernates in the gallery where it underwent metamorphosis. The female flies away in spring, when the diurnal temperature reaches 18 °C. It locates another tree and bores through the wood, forming a characteristic network of galleries of a uniform diameter of 2 to 5 mm (*) . The initial gallery is perpendicular to the branch axis, then forks off to form, in the large branches, a concentric ring. From this ring, short galleries are dug parallel to the branch axis. 10 to 15 days after the attacks on the trunk, the female lays about 40 eggs in the galleries.
- Larva: appears a few days after laying and develops over 4 to 6 weeks. It does not dig any galleries and feeds on a xylophagous fungi, "Ambrosia", the spores of which are carried by the female.
- Pupa: pupation lasts 10 to 15 days.
- 1 annual generation.
- The adults stay in the galleries during summer, autumn and winter. They come out of the tree and swarm in the next spring, from mid-March to end of April.
The European shot-hole borer attacks healthy trees. The drilling of galleries often leads to the death of young hosts and a rapid decline of older trees which dry up suddenly after flowering. In vigorous trees, the sap fills up the galleries and can impede the development of the eggs and the larvae.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.