Animal

Hover fly

Syrphidae (family)

Also known as: Syrphid fly, Flower fly

A large family of flies (~6,000 species globally; ~900 in North America) that mimic bees and wasps in coloration but lack stingers. Adult hover flies are major pollinators — second only to bees in many ecosystems by some measures — visiting flowers for nectar and pollen. Larvae of many species are voracious aphid predators, making hover flies among the most-significant beneficial insects in gardens and farms. Often overlooked or mistaken for bees; understanding their importance is foundational to ecological pest management and pollinator conservation.

Identification

Body — varies; many species have black-and-yellow bee-like or wasp-like markings (Batesian mimicry)
Distinctive flight — hover stationary in air, then dart sideways or backward — a flight pattern bees can’t match
Wing posture — at rest, wings held angled away from body (bees fold over)
Eyes — large, often filling much of the head (typical fly trait)
Single pair of wings — flies have one pair (bees have two pairs); hard to see in flight

The hover-bee distinction:

Hovers stationary — hover fly
Lands and walks on flower — bee
Both can be at the same flower at the same time

Adult role: pollination

Hover-fly adults visit a wide range of flowers for nectar and pollen. They:

Carry pollen on body hairs (less hairy than bees, but enough)
Visit early-spring and late-fall flowers when many bees are inactive
Active at lower temperatures than most bees
Major pollinators of carrots, [[parsley|parsley]], cilantro, fennel (Apiaceae); brassicas; many wildflowers

In some studies, hover flies pollinate 30%+ of flowers visited; in cool conditions or specific habitats, they may exceed bee contribution.

Larval role: pest predation

Many hover-fly species — particularly Syrphus, Episyrphus, Eupeodes — have predatory larvae that are voracious aphid eaters:

A single hover-fly larva can consume 200-400 aphids during its development
Larvae also eat thrips, scale insects, small caterpillars
Adults lay eggs near aphid colonies; larvae hatch onto the food source

This dual role — pollinator as adult, pest predator as larva — makes hover flies among the most-valuable beneficial insects in any garden or farm system.

How to support hover flies

Plant Apiaceae — carrots, [[parsley|parsley]], cilantro, dill, fennel left to flower; major hover-fly favorites
Plant brassicas — left to flower; hover flies love brassica blooms
Plant native umbel-flowering plants — yarrow, golden alexanders, wild carrot
Tolerate aphids in modest numbers — some aphid presence supports hover-fly larvae
Avoid broad-spectrum insecticides — harm hover flies along with target pests
Maintain diverse landscape — hedgerows, weedy margins, varied flowering

Why this matters

Hover flies are second-most-important pollinator group in many ecosystems and the most-widely-distributed natural aphid predators. Despite this, they’re often invisible to gardeners and farmers (mistaken for bees, or simply unnoticed). Understanding and supporting hover flies improves both pollination outcomes and pest management.

Sources

The Bees in Your Backyard, Wilson and Carril (covers some hover-fly material)
Garden Insects of North America, Whitney Cranshaw (Princeton, 2004)
Multiple syrphid fly research publications

Rooted in life.

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Scientific

shares approach with

Lacewing lacewings and hover flies are complementary garden beneficial insects — both adult pollinators / larval pest predators
Ladybug ladybugs, hover flies, and lacewings are the three foundational beneficial-insect groups for North American gardens and farms

2 inbound links · 2 outbound