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Cydia splendana (Hübner)
Laspeyresia splendana

Insecta, Lepidoptera, Tortricidae .

Chestnut and acorn moth, Chestnut fruit tortrix

Description, Biology, Life Cycle, Damage, Common Names, Images

- Adult: 13 to 18 mm. Trapezoidal fore wings, ashy grey, crossed by fine clear lines; at the posterior angle, a silvery grey spot bordered by brown and containing 4 small black dashes (*) .
- Larva: 12 to 16 mm, quite stout, white or pinky with the first thoracic segment dark brown; abdominal prolegs with 16 to 18 crochets disposed on the circumference; anal prolegs with 8 to 9 crochets grouped anteriorly; no anal comb.
- Cocoon: the caterpillar hibernates in a white cocoon, ovoid, 8 to 10 mm long, incorporating earth and various remains, at a depth of 5 to 8 cm in the ground or under the bark of the host plant.

- 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 (*) .

[R]Life Cycle
- 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.

[R]Common Names
DE: Kastanienwickler, Eichenwickler ES: Oruga de la castaña FR: Carpocapse des châtaignes IT: Cidia o Tortrice tardiva delle castagne PT: Bichado das castanhas GB: Acorn moth, Chestnut fruit tortrix

[R] Images

  1. Cydia splendana (Hübner) Larva emerging from a chestnut (Coutin R. / OPIE)
  2. Cydia splendana (Hübner) Larva in an acorn The acorn has been cut open to display the larval gallery and the accumulation of frass.
  3. Cydia splendana (Hübner) Adulte at rest on a sweet chestnut leaf (Coutin R. / OPIE)

To read this page in French

HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.

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