Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: fruit bearing Rosaceae particularly apple and pear.
- Fecundity: several hundred eggs.
- Egg: embryonic development lasts 2 to 3 weeks.
- Larva: 5 instars for the male, 6 for the female. The caterpillar feeds on leaves and fruit attached to each other by a web. On leaves, the young larva forms a small silken tube on the lower surface, from where gnaws the epidermis and parenchyma; once it is more developed, it eats through the limb attacking it from the side or perforating it. On fruit, it feeds on the epidermis and the pulp in more or less large areas forming patterns.
These attacks are spread over the whole tree, the larva can successively attack many leaves and fruits. The larva hibernates in a silken cocoon woven under the bark or in various other shelters.
- Pupa: development lasts 2 to 3 weeks.
- 2 generations per year and 3 periods of larval activity and of damage of unequal importance.
- Larval activity resumes very early, at the budburst stage C3-D of apple, but at intervals within the population. The larvae enter the open flower and leaf buds situated at the centre of the tree, they tie them together with a dense webbing and feed upon them. It pupates in rolled up leaves.
- The first flight takes place from May-June to July-August depending on the region. The second flight takes place from July-August to October.
- The young larvae from the autumn generation develop until they enter hibernation.
- The damage is caused by larvae feeding on fruit (apple, pear) (*) . It is extremely limited in spring. The damage of the summer generation can be particularly serious. That of the autumn generation depends on the size of the population and the development of rotting, in particular during the storing of attacked fruit.
- The varieties of apple most sensitive are those with very dense fruit such as: the Pippins and the group of the red Deliciouses and its mutants.
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