The Orchid Forum, for the UK and Europe (previously known as The UK Orchid Forum) • View topic - Little black flies
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 Post subject: Little black flies
PostPosted: Sat Jan 07, 2017 2:28 pm 
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Hi not posted for a while but recently I have a problem with little black flies in my compost, all orchids are kept indoors and all have recently been potted in new medium. I've tried to keep the pots as dry as possible before watering but as soon as the water touches the pot they appear only a few at the moment, but I'm afraid if I don't get rid of them they will totally infest my pots, please has anyone any ideas as to what they are, will they do any damage, and how to get rid.

Many thanks

Janet


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 Post subject: Re: Little black flies
PostPosted: Sat Jan 07, 2017 3:06 pm 
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Could be fruit flies, if so then they need wet places to breed, the larvae feed on fungus but will also eat seedlings. I've not had them in orchid pots though so it they could be something else.


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 Post subject: Re: Little black flies
PostPosted: Sat Jan 07, 2017 3:39 pm 
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I think you mean Sciara flies? Fruit flies have orange bodies and the larvae feed on rotting fruit. Sciarid flies are a bit annoying but unlikely to harm full grown orchids. They are particularly attracted to peat and coir based composts. They are fairly easy to get rid of using a biological control with nematodes. Alternatively you can grow a few pinguiculas which will mop up the adults, but won't eradicate them.


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 Post subject: Re: Little black flies
PostPosted: Sat Jan 07, 2017 5:45 pm 
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WilECoyote wrote:
I think you mean Sciara flies? Fruit flies have orange bodies and the larvae feed on rotting fruit. Sciarid flies are a bit annoying but unlikely to harm full grown orchids. They are particularly attracted to peat and coir based composts. They are fairly easy to get rid of using a biological control with nematodes. Alternatively you can grow a few pinguiculas which will mop up the adults, but won't eradicate them.


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Yep, senility again! Fungus gnats.


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