Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plant: beet and wild Chenopodiaceae.
- Adult: it dislikes heat and, according to wheather conditions, lives in the ground or on the aerial parts of the plant. In dry weather, it digs small holes of 0.5 to 2 mm in the underground part of the stem or nibbles the rootlets. In wet weather, it moves about on the ground surface or at the heart of the plant and gnaws the underside of the cotyledons and the peduncle (*) .
The female lays 15 to 20 eggs singly in the ground, near the base of beet stem.
- Egg: embryonic development lasts 4 to 6 days.
- Larva: it gnaws the rootlets then pupates in the ground.
-1 annual generation.
- The adults hibernate in the ground or under decomposing plant matter. They resume their activity in spring. From May onwards, they invade beet crops.
Mating takes place from April to mid-June and egg laying from June to the end of September. Most young adults remain in the fields or in their immediate vicinity.
Feeding by the pigmy mangold beetle kills young plants (*) . Damage is particularly serious in beet crops coming after, or in the vicinity of, a previous beet crop.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.