Asked on Jan 12, 2013

I'm having problems with Fungus Gnats in my greenhouse.

Woodbridge Environmental Tiptophouse.comCAROL HDouglas Hunt


I have a lot of vegetables growing, so I don't want to use chemicals. Is there anything I can use that is safe for food crops? I don't want to poison my yummy spinach.
3 answers
  • Douglas Hunt
    on Jan 12, 2013

    Carol, fungus gnats can be controlled with beneficial Steinernema nematodes or the biological insecticide Bacillus thuringiensis subspecies israelensis (Bti). You will want to take a look at your greenhouse for cultural conditions that favor the fungus gnats. See a complete discussion of fungus gnats and their control from the folks at the University of California-Davis here:

    on Jan 13, 2013

    Douglas, thanks!! I think any greenhouse environment is ideal for those rotten gnats.

  • Will not dish washing detergent mixed with water spayed on the veggies prevent them from doing any damage?

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