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 BSF adults/larvae in San Francisco 
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Joined: Mon Nov 03, 2014 7:25 pm
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Location: San Francisco, CA, USA
Post BSF adults/larvae in San Francisco
Jordan Park area of San Francisco. Approx. neighborhood 37.783877, -122.457918

A number of flies observed in the area plus well establish larval colony taking over a vermiposting tower.

Probably seeded from a BSF composting experiment that failed but produced some breeders. The current larvae appear to be definitely stronger, larger and seem more cold tolerant than the purchased examples so most likely represent a cross with a local wild strain or a completely wild brood.


Tue Nov 04, 2014 6:06 am
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Joined: Sun Mar 06, 2011 9:59 pm
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Location: Alberta Canada
Post Re: BSF adults/larvae in San Francisco
Craig_c welcome to our forum :) If you'd like you can introduce yourself here (link).

I don't mean any disrespect, but we need some kind of detailed evidence before adding a sighting to the map. Certainly some people will make identification errors. If we don't maintain some type of standard for sightings the map will lose credibility. A photo of an adult fly would be preferred.

Photos can be posted here or submitted by email.
blacksoldierflymappingproject@gmail.com

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Tue Nov 04, 2014 10:38 am
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Joined: Sat Mar 05, 2011 11:35 pm
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Location: Central Florida, USA
Post Re: BSF adults/larvae in San Francisco
Hi Craig_c, welcome and thanks for sharing your observations.

BW is correct that we require photographic evidence for the map, but the data is appreciated and we can add you to the map with a photo.

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*I'm not an entomologist, and much of what I write about BSF is an educated guess.


Wed Nov 05, 2014 3:01 pm
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Joined: Mon Nov 03, 2014 7:25 pm
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Location: San Francisco, CA, USA
Post Re: BSF adults/larvae in San Francisco
Here ya go....

Unfortunately due to design of the worm farm, harvesting the pupae and pre-pupae requires doing it by hand since they cannot escape the stack. A number some how found their way down, through the screens and into the liquid catch basin and followed the plumbing out into the drainage container and drowned.

Have to figger out a way to harvest the pupae en masse to transfer to a better composting container.


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File comment: Detail of adults
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File comment: The mass of pupae (these were disturbed earlier) gather in the center of the trays when active while the worms mainly move to to the periphery while the larvae are active.
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Thu Nov 13, 2014 1:26 am
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Post Re: BSF adults/larvae in San Francisco
Craig that's great. We'll get you added to the map in a day or two.

We hope that you're a BSF fan and that you don't really regard having them in your worm bins as infestations ;) Maybe you'd like to comment in the Black Soldier Fly Larvae in Worm Bins thread (link)

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Thu Nov 13, 2014 1:57 am
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Location: San Francisco, CA, USA
Post Re: BSF adults/larvae in San Francisco
No, have a BioPod Plus I can transfer them to eventually, though I really dislike that design. Was actually really happy see this colony start naturally. Main problems is the pre-pupae cannot self-harvest so I have to go in and pick the lil' monsters out by hand. Have to try and come up with a method to harvest the pupae for transfer that doesn't involve picking them out of the compost one at a time.


Thu Nov 13, 2014 2:10 am
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Post Re: BSF adults/larvae in San Francisco
You're on the map (link). We're also interested in any future seasonal data you can provide. The flies are most active in warm weather but we would like to get more definite data on their active season. Dates of first sighting in the spring and last in the fall would be ideal.

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Thu Nov 13, 2014 2:18 am
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Location: San Francisco, CA, USA
Post Re: BSF adults/larvae in San Francisco
Saved this little bugger from the kitty! S/he was flying around one of the CFLs in the living room enjoying the warmth. I figger it flew in through a one of the upper story windows left open a crack for ventilation. Probably followed the light and heat in as it was in the upper 40s, low fifties last night and has been raining for the last two days. Brought my ball cap up under it and it settled down on the fabric for a rest.

Six adult flies in worm bin today, looked like new hatches from the colony there. All looked very large and robust, though sluggish (temp? Mid 50s & damp) Four new adults in the hatchery, released.

Same basic location as last sighting - within 200 yards of coordinates.


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Sat Nov 22, 2014 12:26 am
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Post Re: BSF adults/larvae in San Francisco
Craig thanks for posting the extra information.

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Sun Nov 23, 2014 12:17 pm
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Post Re: BSF adults/larvae in San Francisco
I'm very surprised and encouraged by BSF activity this late in the season and at such low temps! Maybe part of BSF culturing in the future will involve BSF that are bred for cold tolerance.

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*I'm not an entomologist, and much of what I write about BSF is an educated guess.


Mon Jan 05, 2015 10:51 am
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Joined: Mon Nov 03, 2014 7:25 pm
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Location: San Francisco, CA, USA
Post Re: BSF adults/larvae in San Francisco
Saw a runt wildling out in the garden yesterday...

Small, about 2/3 normal size with slightly deformed wings (curled up at the tips). Sorry, no camera.

This was the first BSF sighting of 2015, hopefully we will have a few more sightings soon as the weather is warming (really fast - feels like Indian Summer already) or that the BSFs might recolonize the worm-bin composter.


Fri Apr 17, 2015 3:14 am
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Post Re: BSF adults/larvae in San Francisco
Thanks Craig.

We've already had a few days in the 90's here in Central Florida... :|

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*I'm not an entomologist, and much of what I write about BSF is an educated guess.


Fri Apr 17, 2015 11:28 am
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