Hedya nubiferana (Haworth)
Hedya dimidioalba (Retarus)
Insecta, Lepidoptera, Tortricidae .
- Adult: 18 to 20 mm wingspan. Grey head and thorax, fore wings blackish brown on 3/5 of the basal region, the rest being white and slightly smoky at the apex; the hind wings slate-grey (*) .
- Larva: the young caterpillar is yellow for 8 days then its body becomes dark green with, on each segment, a transversal row of small black tubercles (pinacula) each bearing a thin bristle. The head and the thoracic plate are shiny black. Before hibernation, the larva measures only 6 to 8 mm; after complete development, it is stout, thinned at its two extremeties and reaches 18 to 29 mm (*) .
- Host plants: especially apple, more rarely cherry, plum, almond, apricot, medlar (Mespilus), currant and various forest species such as birch (Betula) and willow (Salix).
- Fecundity: on average 170 eggs.
- Eggs: deposited in clusters, sometimes singly, on the leaves. Embryonic development lasts 6 to 8 days.
- Larva: the caterpillar hibernates at the axil of the bud or in bark cracks, in a small silken cocoon (*) , it then measures 2 to 5 mm. At the beginning of spring, at the time when the buds swell, it abandons its shelter and penetrates the half-open buds; it binds together young leaves with silken threads and gnaws the lamina.
- Pupa: in a cocoon inside a rolled up leaf; pupal stage lasts 15 to 25 days.
- 1 generation per year.
- The caterpillars develop in spring for about 40 days, after which they pupate.
- The flights occurs in the Paris region from end of May to beginning July.
A single caterpillar can cause the drying up of 2 to 3 inflorescences. Also, the young caterpillars superficially nibble the skin of late apples (*) which can encourage the development of moulds and rotting of the fruit.
DE: Grauer Knospenwickler ES: Oruga verde de las yemas FR: Tordeuse verte des bourgeons IT: Tortrice verde dei germogli PT: Traša verde dos gomos GB: Green budworm, Marbled orchard tortrix, Green budworm
- Hedya nubiferana (Haworth) Moth on an apple tree (Coutin R. / OPIE)
Hedya nubiferana (Haworth) Overwintering cocoon of a young larva The cocoonn has been opened to show the larva which overwinter in the 2nd instar on the bark of an apple tree.
Hedya nubiferana (Haworth) Surface damage on an apple (Coutin R. / OPIE)
Hedya nubiferana (Haworth) Fully grown larva at rest in a folded leaf (Bouloux G. / OPIE)
Hedya nubiferana (Haworth) Damage on an apple In autumn. The larva, hidden under the leaf it has attached to the fruit with silky threads, nibbles the epidermis of the apple.
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