Insecta, Lepidoptera, Tortricidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plant: chestnut, oak (Quercus), more rarely hazel.
- Adult: egg laying starts 24 hours after the females have emerged and occurs at intervals over about 10 days. Average fecundity: 60 eggs.
- Eggs: they are deposited on the underside but especially on the upper surface of the leaves. Development lasts 10 to 15 days.
- Larva: goes through 5 instars and growth lasts 3 weeks. The young caterpillar moves about on the foliage and the branches, then penetrates the buds close to the point of attachement; it enters the fruit through the hilum, then gnaws the inside of the nut and soils the fruit with its frass (*) .
- 1 generation per year.
- At the end of its development (from the end of September to mid-November with a maximum towards mid-October), the caterpillar abandons the fruits making a hole of 2 to 3 mm in diameter and forms a silken cell in the earth in which it hibernates. In the south of France, it pupates in July and the moths appear during the second half of August.
On hestnut, the presence of attacked fruit lowers the quality of production and necessitates costly sorting of the crop.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.