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Old 10-08-2013, 11:27 PM   #1
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Default Fruit flies

I don't worry too much about the final product normally, but 4 weeks ago I've brewed a modified version of EdWort's Pale.

Tonight I open my ferm chamber (refrigerator) and I saw 2 fruit flies. Noooooo !

I ferment with loose lid. Remove the lid and see a dead fruit fly sticking on the inside of the lid due to the condensation.

This is annoying. But I take a sample, gravity is fine, smells is niiiice and it taste good right from the primary, very hoppy I have to say. Didn't know it will turn out that hoppy following the recipe.

Can someone tell me if contamination due to fruit flies show signs of degradation AFTER primary or if this kind of contamination show symptoms at the early stage of fermentation ? Should it be ok if it seems fine now ?

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Old 10-08-2013, 11:35 PM   #2
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I don't know if there is a concrete answer to your question. Most likely the fruit fly suffocated once it got inside the fermenter due to lack of oxygen and high levels of CO2. Contamination is a numbers game, it all depends on what bacteria or wild yeasts were present on the little bastard when he flew in, and whether they can gain a foothold and multiply in the environment. Chances are with the alcohol and hop oils you should be fine. It is possible that the contamination could grow with time, but that's anybodys guess... I would say if you're worried about it, start drinking it soon!

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Old 10-08-2013, 11:41 PM   #3
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I'd drink it sooner, rather than later.

Generally, fruitflies carry aceterobacter. That's the bacteria that is used to make vinegar. The interesting thing about that bacteria is that they eat alcohol, and produce vinegar, c02 and water-, so unless the beer was like 10%+ abv, acetero bacter would do very well in that environment. It needs oxygen to do this, so a bucket with lots of headspace (and especially a loose fitting lid) would help it along.

If if doesn't taste like vinegar, that's great and a good sign. But again, drink it sooner rather than later.

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Old 10-09-2013, 01:04 AM   #4
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Interesting

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Old 10-09-2013, 01:11 AM   #5
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I had this in a recent half batch of hard apple cider, fruit flies (4-6 of them) got into the loose-lidded bucket, inside my ferm chamber, and I didn't realize for a couple weeks.

When I checked it they were dead of course, but there was like a sludge in the cider, I could only assume they laid eggs. Even if they hadn't, that's all I could think of and wouldn't be able to drink or serve it, so had to dump it. My first dump batch in 2.5 years of brewing.

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Old 10-09-2013, 03:10 PM   #6
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Normally I agree with everything Yooper says. But . . . (you saw that coming, didn’t you?) Maybe there was a problem with the coffee. Maybe the spellcheck went crazy.

The name of the bacteria is acetobacter aceti, not aceterobacter.

But yeah, drink it quick.

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Old 10-09-2013, 03:56 PM   #7
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I've got fruit flies around my house now grr. Do you plan on bottling or kegging? Kegging is easier, just make sure to not contaminate any lines if this is slowly turning to vinegar. Bottling... you might end up with bombs.

Also to capture them I make a trap like this
http://3.bp.blogspot.com/-M7fVGx8XSy...10613-1107.jpg

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Old 10-09-2013, 04:27 PM   #8
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Default Apple Cider Vinager works wonders

We have some concord grape wine working right now and Apple cider vinager seems to work pretty well for these pests. My $0.02

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Old 10-09-2013, 07:06 PM   #9
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Quote:
Originally Posted by THEUKRAINIAN View Post
We have some concord grape wine working right now and Apple cider vinager seems to work pretty well for these pests. My $0.02
So apple cider vinager helps kill them? What do you do just spray them or what??
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Old 10-09-2013, 08:12 PM   #10
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Quote:
Originally Posted by integra93ls
So apple cider vinager helps kill them? What do you do just spray them or what??
A small glass near the carboys or your fermenter and they will flock to it.
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