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Phyllotreta striolata (Fabricius) - (striped flea beetle)
The flea beetle is native to Eurasia and has invaded North America (before 1700) and South Africa. It attacks various types of crucifer crops and breeds also in cruciferous weeds. The main damage is caused by the adults feeding on the foliage. The feeding produces small holes and infested plants look bronzed or burned, young plants can be killed. Control in canola is mainly practiced by using insecticidal seed dressings. The adult is around 2 mm long or slightly larger, shiny black with a wavy yellow band along each elytron.
|• Deutsch:||gebänderter Erdfloh|
|• English:||striped flea beetle|
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The eggs are laid into the soil next to a host plant and the larvae feed on the roots. The life cycle from egg, through 3 larval stages, to mature adult lasts around 4-6 weeks. There may be 2 generations per year in warmer climates and the adults overwinter in the soil or in leaf litter.
For details see the respective page in Wikipedia.