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Metriochroa latifoliella Millière
Oecophyllembius latifoliella, Parectopa latifoliella

Insecta, Lepidoptera, Gracillariidae .

Small olive leaf miner

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

- Adult: very small moth, wingspan 8 mm, very elongate wings, a greyish body with metallic sheen and fringed with small hairs.
- Egg: almost elliptical, flattened, 0.5 mm long and 0.3 mm wide, pale, iridescent yellow, becoming progressively greenish.
- Larva: yellow. Body flattened ventrally, with broadened abdominal segments; the terminal, forked section is composed of two conical processes. No thoracic legs. Flattened head. At full development, the caterpillar reaches 6 mm long and 1 mm wide.
- Pupa: in a silken cocoon at the end of the mine formed by the larva in the leaf. (*) . The pupa measures 4.5 mm long. The head section is prolonged on the dorsal surface by a median lanceolate appendage. The cremaster is forked.

- Host plants: olive, as well as filarias (Phillyrea media and P. angustifolia).
- Mating may take place the day after emergence of the adults.
- Egg-laying follows shortly after coupling and continues for 10 to 15 days.
- The rate of larval development depends to a great extent upon climatic conditions. In the spring, the larva pupates 28 to 45 days after hatching, but only after several months in the case of the overwintering generation.
The neonate larva enters the leaf through the base of the chorion; it excavates a gallery towards the tip of the leaf, then turns and moves towards the petiole. Mining progressively spreads.
The caterpillar passes through 2 instars and through a prepupal phase prior to pupation.
- Pupation lasts 11 to 18 days. The pupa, supported on its cremaster, perforates the upper epidermis of the leaf with its head spur and remains partly attached until adult emergence.

[R]Life Cycle
3 generations each year, one overwintering in the larval stage.
The first adults appear at the beginning of spring; they are active from the end of March to the end of May. Moths of the summer generation fly from the end of June until early August; those of the autumn generation from the end of September to October.

Mining may occupy most of the lamina of infested leaves but damage only erarely causes economically important losses.

[R]Common Names
DE: Ölbaumminiermotte ES: Minador de la hoja del olivo FR: Petite mineuse des feuilles d'olivier IT: Ecofillembio dell'olivo PT: Ecofilêmbio da oliveira; Mineira das folhas da oliveira GB: Small olive leaf miner

[R] Images

  1. Metriochroa latifoliella Millière Above: mine; below: cast skin of pupa (From a photo INRA Antibes)

To read this page in French

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

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