Aphids and Syrphids, Living With Ants

Hover Fly, Heliophilus fasciatus

Hover fly larvae, like most fly larvae are maggots and relatively sedentary. Female hover flies lay eggs on plants with aphids, the primary food of predatory hover fly larvae. If aphid populations are adequate, development and survival to the pupa stage can approach 100%.

Ants can alter the math. The reason is clear from a study involving ants, syrphid larvae and aphids.* In the presence of ants, only about half the hover flies survive to the pupa stage….

Source: Living With Insects Blog

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