Flea beetle (Psylliodes). These tiny beetles of only 2 to 3 mm in size belong to the leaf beetles. Flea beetles can make big jumps. They are usually colored black or steel blue.
Flea beetles belong to the pests of cultivated plants: the adults feed on leaves and the larvae feed on roots. Furthermore: some flea beetles carry plant diseases (e.g. late blight).
Flea beetles mainly live on cruciferous plants
Flea beetles lay eggs on the undersides of leaves in the spring. The larvae feed on the plant roots without causing much damage. One generation per year – flea beetles hibernate in the soil.
Regular irrigation or watering prevents fleas from developing strongly. They like dry conditions.