Insecta, Lepidoptera, Lyonetiidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: apple, more rarely, pear, cherry, quince and birch (Betula).
- The moth oviposite on the underside of leaves.
- Egg: embryonic development may exceed one month.
- The caterpillar lives as a leaf miner; the concentric galleries, diameter 5 to 6 mm, form whitish then brown spots, in which owing to leaf transparency, the frass is visible, grouped in darker concentric circles (*) .
On completion of growth, the caterpillar leaves the gallery and spins a cocoon (*) on the surface of the leaf (1st generation) or in cracks in the bark on the underside of branches (2nd overwintering generation).
- Pupa: formed after 2 days, its development lasts 8 days for the summer generation.
- 2 generations per annum, sometimes a partial 3rd generation.
- The pupa overwinters, the moths emerging in April. Larval development is completed by June. The 2nd generation caterpillars cause the same damage, from mid-July to early September. The most precocious larvae pupate and produce a 3rd partial generation at the beginning of August.
- In the event of heavy infestation, the leaf surface is severely damaged by the presence of mines and photosynthesis is reduced (*) .
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