An auxiliary insect is an insect that has a beneficial effect on the human environment to the extent that it effectively fights against plant insects that eat humans or he uses.

This refers among others to bee, bumblebee, ladybug, pierces the ear, hoverflies and predatory bug.

Hoverfly aphidiphage

Diptera: Syrphidae

Type: beneficial insect

It belongs to the second group of the most common insect pollinators after the bees (Apidae) are also useful to farmers. 
 In addition, she eats aphids.

The hoverfly lays its eggs in aphid colonies. According to the observations of researchers, each larva, 3 to 4 days after hatching until pupation, eats up to 300 aphids per night.

Like many other insects, hoverfly has four stages in its life cycle: egg, larva, pupa and adult. Adult hoverfly feeds on pollen and nectar.

Source: Agriculture and Agri-Food Canada