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Home Brew Forums > Home Brewing Beer > General Beer Discussion > Need some opinions, got a fruit fly in my starter
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Old 07-17-2013, 11:43 PM   #1
cjalderman
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Default Need some opinions, got a fruit fly in my starter

Aright so I have a 0.75 L starter going with wyeast 3787 trappist HG. I'll outline my process just to be thorough, so bear with me.
-I submerged my gallon jug into a bucket of starsan for 5 min
-I opened the lid on my cooled starter wort and poured it into the jug
-covered with foil and aerated by shaking
-pour in yeast and cover again

I came back an hour later to find a singular fruit fly floating in my starter So I fished it out with a sterilized knife immediately (pain in the ass). I checked back an hour later and its going strong with no noticeably off aroma.

My question is, should I pitch it? Since it was only one fly, would the yeast not beat out any bacteria that may have contaminated the starter?


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Old 07-17-2013, 11:55 PM   #2
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I'd say you will probably be fine. If it starts to look/smell/taste funny, then consider giving it another go.


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Old 07-19-2013, 02:03 AM   #3
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Their is no reason to use this yeast IMHO, if you swap it now, it's no big deal. If you have an infection, that is a lot of time and money wasted.
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Old 07-19-2013, 02:08 AM   #4
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Agreed. I just did a cream ale and had a sugar ant in the starter. It seems fine so far...no off smells or flavor yet but truth be told ya never know. What did you decide?
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Old 07-25-2013, 05:29 AM   #5
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I ended up tossing this starter down the drain. It's not worth the risk IMO
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Old 07-25-2013, 05:31 AM   #6
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Fruit flies carry acetobacter which can turn alcohol into vinegar. I hate those little fruit flies.
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Old 07-25-2013, 10:39 AM   #7
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How to keep fruit flies out? Personally I would use it.
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Old 07-25-2013, 11:41 AM   #8
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I agree that tossing it was the best thing to do. I'd ask it this way: is it better to throw out the materials and time that went into a starter or to risk throwing out the materials and time that went into a full batch?
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Old 07-25-2013, 06:19 PM   #9
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I look at more like a lesson learned. If you always take the cautious route you will have not have a good idea of what you can get away with. Obviously the yeast are massively dominant over bacteria in the starter. Fruit flies will surely be around for the new starter made so it's not like your even guaranteed success just by starting over.
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Old 07-26-2013, 02:58 AM   #10
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I would have let it finish, just out of curiosity to see what happened. If the starter finished and the beer from it tasted clean, it might have been just fine. Or, it might have been nasty vinegar bug juice.

But for a few bucks of yeast, no big loss to start over, compared to the risk of a ruined batch.


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