Posts Tagged: Syrphidae
Have you seen the little syrphid flies, aka flower flies and hover flies, hovering around the early spring blossoms?
Native pollinator specialist Robbin Thorp, emeritus professor of entomology at the UC Davis Department of Entomology, said these syrphids (below) are probably from the genus Toxomerus. The family is Syrphidae (flower flies).
The larvae of these insects are good to have in your garden--they eat aphids, thrips and small caterpillars. The adults feed on nectar and pollen.
The syrphids fly so fast that you almost need a motor drive to capture them in flight. Plus, they seem especially skittish this time of year. Shadow them with your body or camera and they're gone in a flash.To learn more about flower flies, a good read is Robert Buggs' 25-page booklet, "Flower Flies (Syrphidae) and Other Biological Control Agents for Aphids in Vegetable Crops," published in May 2008 by the University of California, Division of Agriculture and Natural Resources (UC ANR). You can download it for free by accessing this page.
It's illustrated with photos that will help you recognize many of the syrphids.
The warmth of the sun and the lure of nectar beckoned the hover flies or flower flies to our bee friendly garden.
We saw this one nectaring the rock purslane (Calandrinia grandiflora) last weekend. Native pollinator specialist Robbin Thorp, emeritus professor of entomology at UC Davis, identified it as "family Syrphidae, probably the genus Platycheirus."
It stood quite still, sipping the nectar and soon honey bees and a mason wasp joined it.
But for a minute, it seemed to have a "Mine" sign slapped on the blossom.
Hover fly on rock purslane
Ready for Take-Off
A dandelion poking through the rocks near Nick's Cove on Tomales Bay, in Marshall, Sonoma County, seemed an unlikely host for squatters' rights.
It first drew a tiny bee, barely a quarter-inch long. It was a female sweat bee, family Halictidae, genus Lasioglossum, subgenus Dialictus.
She claimed the dandelion all to herself.
Not for long.
Another insect shadowed the dandelion and swooped down to feed.
It was a hover fly, family Syrphidae. (Probably a Eristalinus aeneus, observed UC Davis pollinator specialist Robbin Thorp, emeritus professor of entomology at UC Davis.)
So on one dandelion: a fly and a bee.
The fly is bigger. But the bee can sting. The sting, however, is rated only 1.0 on the Schmidt Sting Pain Index compiled by (now retired) entomologist Justin O. Schmidt at the Carl Hayden Bee Research Center, Tucson, Ariz.
Fight or flight?
The dandelion blossom belongs to the fly.
On the Rim
If it looks like a duck, quacks like a duck, and walks like a duck, it's probably a duck.
If it looks like a bee, buzzes like a bee, and visits flowers like a bee, it might not be a bee.
It could be a fly, or more specifically, a syrphid or flower fly.
Syrphids, also known as hover flies (from the family Syrphidae and order Diptera), are everywhere.
They hover over flowers like a helicopter over a meadow and then touch down. You'll see them nectaring blossoms, zipping from one flower to the other. When they're shadowed or startled, off they go.
Several of them were nectaring on our newly opened pink cactus blossoms this morning.
To the untrained eye, syrphids are often mistaken for honey bees. However, think number of wings (honey bees have four wings, syrphids have two), overall size, distinct coloration, and different antennae. Different antennae? Yes. Honey bees have long antennae bent at a right angle. Syrphids have a specialized bristle (arista) on the end of each antenna. It looks like a knob.
So, if it looks like a duck, walks like a duck and quacks like a duck, it's probably a duck.
If it visits flowers, it might not be a bee. It could "bee" a fly.
Hover flies do know how to hover.
Like a helicopter with spinning blades, the hover fly lingers seemingly motionless in mid-air over a flower before zeroing down to feed on the nectar.
Sometimes they’re called flower flies. Sometimes syprhids. They’re from the family Syrphidae and mimic the black-and-yellow coloring of wasps or bees. The coloring protects them from predators. Leave me alone! Let me bee!
Last Sunday our rock purslane (Calandrinia grandiflora) attracted its share of honey bees and hover flies.
In fact, so popular was the rock purslane (which we purchased from Ray and Maria Lopez of El Rancho Nursery and Landscaping,
Instead I focused my macro lens, shot away, and then, for fun, altered the image in Photoshop with “poster edges.”
For a brief period, the hover fly became my poster child.