Insecta, Lepidoptera, Tortricidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- The caterpillars are found on Rosaceae, especially apple and pear, more rarely peach, plum and quince, rose (Rosa); they can also develop on forest trees: birch (Betula), maple (Acer), plane (Platanus), poplar (Populus), oak (Quercus), lime (Tilia), ash (Fraximus), elm (Ulmus), as well as bushes and annual or perennial plants: currant, raspberry, hop, hazel, laurel (Larrus), privet (Ligustrum), honeysuckle (Lonicera), myrtle (Myrtus), lilac (Syringa vulgaris), quelder-rose (Viburnum), nettle (Urtica).
- Adult: lifespan of 15 days. Average fecundity: 100 to 150 eggs.
- Eggs: distributed in 2 to 9 egg-rafts and disposed preferentially on the smooth surfaces of bark; they remain in diapause until the next spring.
- Larva: larval development lasts 28 to 55 days. The young caterpillars penetrate buds and bind the young leaves together with silk. Following this, they roll up the leaves making a sort of cigar (*) and gnaw the parenchyma leaving only the veins; the terminal buds are often most attacked. When larvae penetrate the still closed bud, they incise the peduncle below the calyx. During flowering, they gnaw the stamens and the pistil binding the petals by silk threads; this mode of attack is particularly frequent on apple.
- Pupa: development lasts 15 to 20 days.
- 1 generation per year.
- Hatching takes place from the end of February to the beginning of May depending on the temperature and the region; it finishes by the second flowering of apple trees at stage E; It occurs at intervals over an extended period following the exposition of the egg-rafts. Pupation occurs inside shrivelled leaves. Flights are observed from end of May to end of July. Eggs remain in diapause until the next spring.
Damage is frequent on apple and pear (*) . The incisions on the bud peduncle lead to premature drop.Also, the fruits in contact with leaves are nibbled quite deeply in May and June which results in a local cessation of growth and in quite marked deformations (*) .
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.