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1 day old eggs dissappear
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Author:  LarvaLover [ Mon Aug 28, 2017 1:49 am ]
Post subject:  1 day old eggs dissappear

My current setup is a Rubbermaid bin, no crawl-off ramp, very moist but not soggy coir substrate.
I have had lots of mature larva crawl to the surface, lots of adult flies, but never saw any egg clusters and only very few young larva.
Then I watched a female laying eggs in crack where the upside down lid rested on the edge of the tub (leaving a small gap at one end for fly entrance). When I checked it, there were eggs covering a 2 inch length of the rim of the bin. I was so excited! Then the next morning, all the eggs were gone. The next day the same thing happened in another spot on the rim of the tub, and all the eggs were gone by the next morning.
What happened?
We have some small ants around the house, but I have protected the bin from ant intrusion and have seen none in the bin. I have had a problem with yellow jackets snatching the adults from mid air and from the sides of the bin while they are waiting for their wings to dry. However, yellow jackets are not active during the night.
Any ideas???
--LL

Author:  kstenger [ Mon Aug 28, 2017 6:05 pm ]
Post subject:  Re: 1 day old eggs dissappear

First, I wonder if the fly you saw was a BSF or a similar one whose eggs hatch faster.

Second I wonder if there is a possibility that some larvae crawled up looking for a way out and accidentally detached the eggs from their place (don't worry, they are not cannivals).

Then I have a tip: you could try to isolate the eggs once spotted, as carefully as possible detach them and move them into a plastic pot over just a little amount of food at the bottom (I've done this with a little piece of bannana scraps).
Cover the pot with some film to ensure nothing comes in or out.
They will prefer to stay on the scraps as it's soft, relatively wet, they can hide inside to get darkness, and it's their first meal!
Take a look at your bin once a day and move them away together into the other pot like this you can tell if they hatch or not.
You can use different fresh pieces of scraps for each hatch, so you can move them into the larger bin by just moving the scraps.
You may not notice movement until several days after on the bannana scraps, unless you have a *very* good eye ;-)
Once you feel more confident with them actually hatching just skip this intermediate step.

Another tip would be to wait a few more days (at least 7 to 10 days) to check for young larvae in your bin.

In my case, even after hatched, I've noticed some unhatched eggs left behind, stuck to the place where the female layed them.

Last, I'm not an expert and just speak out of my own experience which is not much, but goes well so far :-)

Author:  kstenger [ Wed Apr 11, 2018 1:34 pm ]
Post subject:  Re: 1 day old eggs dissappear

After some bad experiences I had this summer with ants I would suggest to keep an eye on them, they absolutely LOVE both BSF and BSFL and will do anything to catch them on any living stage

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