This fly was in my yard last week. San Juan Island, WA. 06.19.2021. It’s taken me about a week to get around to ID, but I believe this to be Eupeodes fumipennis (the Western Aphideater, a syrphid fly that happens to be a bee mimic.
In case you are wondering about that name. The Western Aphideater does actually eat aphids in the larval stage. To see what a syrphid fly larva looks like in action, check out my blog post with more video footage here –https://buggingyoufromsanjuanisland.com/…/honeysuckle…/ – also viewable in the photo below. While I have not been able to identify the species name of the syrphid fly larva in that post, you can definitely see where the Western Aphideater fly might get its name.
I photographed and filmed these tiny white “lambs” over the weekend (Sept. 21, 2019). There is a patch of Reed canary grass growing in a wetland area near my house and I wanted to see what sort of insects I might find associated with this particular plant.
These “lambs” are actually Honeysuckle aphids (Rhopalomyzus lonicerae). The species epithet, lonicerae refers to honeysuckle. These particular aphids live on honeysuckle in the winter and in grasses (as in the Reed Canary grass) in summer (4,5). The creamy white form (pictured above) are wingless, sub-adults, the apterae (without-wings) ~ Aphid glossary here: https://influentialpoints.com/aphid/Aphid-glossary.htm . There were quite a few of them and they were huddled together somewhat herd-like (see video below) on the grass stems. I did spot an adult or two (photo below), dispersed in other patches of grass, but absent from the groups of young.
The most amazing part to me was the “wolf” disguised in my herd of aphid lambs. This big bad wolf was actually a syrphid fly larva devouring one little lamb after another. It surprised me that they all waited, rather obediently, without resistance, as one after another was sucked dry by the fly-wolf. Note the dried out skins remaining on the leaf when you view the videos of the little lambs I found in the grass below. 🐑
Baaad or Good? Give me a thumbs up or down and let me know what you think! Thanks for reading.
Reed canary grass (Phalaris arundinacea) is in the plant family Poacea. Historically, reed canary grass has been considered good fodder for livestock, especially in areas too wet to grow traditional hay crops (3). In Washington State, it is now considered a non-native, noxious weed by the Washington State Noxious Weed Control Board (1). However in further review of literature about this plant, I came across one publication contradicting this view. This one cites published research that, in the Pacific Northwest there is evidence that some varieties of this widespread “circumboreal” grass are native to Western North America (2) .
Native? Noxious? Invasive? If you want to read more about Reed Canary grass, please do take a minute to check out the referenced links below.