Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plant: pear.
- Adult: feeds on pollen. Males are rare, reproduction is mainly parthenogenetic.
- Egg: time until hatching, 10 to 13 days.
- Larva: developmental duration, 20 days; 4 moults.
- 1 generation per year.
- The larva digs a gallery beneath the epidermis of the young fruit, at the base of the sepals which then wither. It then burrows towards the centre of the fruit and bites through the pips (primary attack). It leaves the fruit close to the calyx and attacks another (secondary attack), but rarely a 3rd. It then drops to the ground, burrows down a few cm and then spins a silken cocoon. It remains in diapause until February, and pupates in spring.
- The adult appears in late March to early April. The flight period is staggered over a period of 4 to 20 days. The female lays eggs in the flower buds at stage G (*) , making an oblique incision towards the centre of the calyx with the saw-like ovipositor and lays an egg beneath the epidermis between 2 sepals (*) .
- The egg swells and hatching often begins at stage G.
Both primary and secondary attacks cause the fruits to fall prematurely (*) .
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.