When it is eaten by larvae, it kills them.īacillus thuringiensis is available in various commercial products. israelensis or Bti, is a naturally occurring soil bacteria that is toxic to a variety of insects. Bacillus thuringiensis kills Fungus Gnatsīacillus thuringiensis subsp. Yellow sticky cards have no effect on eggs, larvae or pupae, but over a 2-3 week period you will get rid of most of them, as new flies hatch out. The commercial products do work to control and monitor populations but they won’t get every last fly. There is a commercial product called Tangle-trap that might work when it is applied to yellow cards. I asked if these work in Facebook groups and the answer is no. The DIY suggestions online include coating with Vaseline, honey, glue, and motor oil. Flies are attracted to them, stick, and die. Place yellow sticky traps near plants, and right on the soil surface. I doubt that coir is any better.ĭrying the soil does work. Unfortunately almost all seedling mix uses peat moss. Try to avoid soils containing peat moss as it tends to hold water longer than soil. It makes it harder for existing larvae to survive and it discourages flies from laying new eggs. They then pupate for 3-4 days before new adults hatch out. The eggs hatch in 4-6 days and the larvae feed on plant roots for about two weeks. Fungus Gnat Life CycleĪdults live for about a week and during that time they lay a couple of hundred eggs in moist soil. It has a black head and a whitish transparent body. You might also notice the larvae (or maggot) in the soil, but it is also quite small and usually stays underground. They are not strong fliers and usually don’t venture too far from the plants. The adult is a small, delicate, mosquito-like fly, about 1/8″ in size, with one pair of clear wings. People first notice fungus gnats because they fly around the plants and your head while you are tending the plants. Listening to other uninformed people on the internet does not work. Without this knowledge, it is difficult to figure out the best way to control it.
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People are always asking me how to control some kind of pest on their plants and my answer usually starts with, “identify the bug and then learn about its life cycle.” The life cycle describes the way the bug lives from egg to full adult. How to Get Rid of Fungus Gnats on Houseplants
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