Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: brassicas, particularly cabbage, cauliflower, rape.
- Adult: they overwinter under clods of earth and in various other sheltered situations. Once activity resumes, they congregate on wild or cultivated brassicas and take small bites of 1 to 2 mm in diameter which do not penetrate the whole thickness of the leaf (*) .
The eggs are deposited singly on the ground in the vicinity of the neck of brassicas, particularly of the wild mustard (Sinapis arvensis).
- Egg: development lasts about ten days.
- Larva: it gnaws the roots for 3 to 4 weeks then pupates in the ground.
- Pupation: lasts about ten days.
- 1 generation per year. In August, the newly emerged adult climbs back up to the surface and begins to feed on the brassica leaves until the end of autumn. When the cold days arrive, it takes shelter until the next spring. In May it resumes its activity and mates.
If the flea beetles are numerous and the temperature high, damage can be substantial, particularly on young seedlings which may be destroyed.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.