Hoverfly [en]
According to Wikipedia "
Many species of hoverfly larvae prey upon pest insects, including
aphids and the
leafhoppers which spread some diseases like
curly top. Therefore they are seen in biocontrol as a natural means of reducing the levels of pests.
Gardeners, therefore, will sometimes use
companion plants to attract hoverflies. Those reputed to do so include
alyssum,
Iberis umbellata,
statice,
buckwheat,
chamomile,
parsley, and
yarrow."
Syrphidae [fr]
D'après Wikipedia "Le syrphe est un allié naturel de l'homme dans sa lutte éternelle pour la subsistance : sa larve se nourrit de centaines de
pucerons, qui dévorent nos récoltes. On plante, en bordure des champs, des
phacelia pour nourrir les syrphes, dont les larves dévorent les pucerons, l'
œillet d'Inde attire ce genre d'insecte aussi."