Little black flies on my indoor plants - Ask Extension
Hello Fine Folks,
Every winter I move some of my potted herbs indoors and each winter I get a huge number of these little black flies (like fruit fli...
Little black flies on my indoor plants #817063
Asked November 30, 2022, 9:52 AM EST
Hello Fine Folks,
Every winter I move some of my potted herbs indoors and each winter I get a huge number of these little black flies (like fruit flies). I started spraying the herbs with NEEM oil, but it doesn't seem to be working. Please help!!
Hi Scott, I think what you have are probably Fungus Gnats. I am sending you a couple links to help you deal with them. I have had some success with the yellow sticky traps. Keeping the soil dry is also helpful. I have not tried the potato suggestion, but that does sound like a logical solution. It is a problem that takes some persistence to cure. The plants were probably infected outside and became worse when moved inside. If the problem is severe enough you may want to treat with an insecticide containing a pyrethroid or imidacloprid as suggested in the links. You will have to check the ingredients contained in the product you choose. The larvae are more difficult to kill than the adults. One other suggestion, if you have other houseplants, I would suggest moving them an isolated area, so they don't become infected. Hope this is helpful to you, The Boulder County Master Gardeners
This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.