Black Flies - Knowledgebase Question

Staten Island, NY
Avatar for wolfmother19
Question by wolfmother19
April 30, 2007
There was mention of a vinegar solution to get rid of black flies around house plants but I can't seem to find it. Could you please give it to me as we have these black flies around our house plants. Thank you.

Answer from NGA
April 30, 2007
The little black flies are probably fungus gnats. They tend to be attracted to (overwatered) houseplants where the soil surface never dries out. The solution is to water your plants less often so the soil surface dries and they have no place to breed. Or, if you have plants that actually require a constantly wet soil, you can place a layer of coarse sand or gravel over top of the soil. This fast draining layer will dry out and deprive them of their preferred location. The adults will die off and there will be no subsequent generations to replace them so you should see them disappear in about ten days.

Another control is to use a product called Gnatrol, read and follow the label directions. (It is a soil drench.)

As far as vinegar goes, if you set out a little plate or small glass of vinegar some of the adults will be attracted to that and drown in it. In my experience you will not catch all of them that way, though.

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