Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: wheat, barley and, more rarely, oats.
- Adult: quite active, it flies at a small distance above the ground and sisperses over cereal crops. It gnaws the flowers and the young seeds during the night and hides under clods of earth or under plants during the day. The eggs are deposited in clusters of 3 to 5 in a small gallery.
Average fecundity, 80 to 100 eggs.
- Egg: development lasts 2 to 3 weeks.
- Larva: it excavates a deep and narrow burrow, up to 30 cm, in the ground in which it takes refuge during the day (*) . At night, it gnaws the leaf parenchyma, leaving only the veins which form a hairy mass on the ground. It pulls the extremity of the leaves inside the gallery in order to devour them during the day.
- Pupation: at the extremity of the gallery.
- 1 generation per year.
- The adult emerges in June; egg laying begins shortly after and lasts until the end of autumn. Larval damage appears in November on young cereals. During winter, larval activity slows down and resumes with heightened intensity in spring. Larvae pupate, in May, after which the new adult emerge.
Cereal plants can be totally devoured and damage is often extensive (*) .
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.