As with any biological control measure, they are most effective when used preventively in conjunction with good cultural practices such as greenhouse sanitation and regular monitoring.

Within the now dead larvea there will start to grow a new generation of useful nematodes that will once again start to seek out larvae to infect. Nematodes Heterorhabditis bacteriophora are natural parasites of the larvae and can move through the soil to hunt them down. Some carrier cellulose may not fully dissolve and can block watering can holes, so monitor and clear holes as necessary.

The beneficial nematodes will gradually sink to the bottom so stir occasionally as you pour to keep the nematodes distributed in the water. For smaller areas or if using for a heavy infestation, apply a third of the pack at a time, 7-10 days apart to ensure that no product is wasted. Nemaknights Biological Gnat Control allows for a convenient spot treatment solution that makes it easy to apply to multiple planters at one time. Overwatering your houseplants, or simply having a lot of them, can wreak havoc to your indoor space.

Additionally, they reproduce quickly and a small fungus gnat problem can soon escalate to a significant (and highly irritating) infestation.

The bacteria kills the host within hours, and the nematodes grow and reproduce within the 'broth', which they produce. And it is even better when we can use a natural biological method of control, instead of always resorting to the insecticidal soap. feltiae can cause 40% reduction in fungus gnat population in Ball-mix, 50% in Metro-mix and 56% in Pro-mix, but only 27% in the Nursery-mix. Steinernema feltiae is primarily used against fungus gnat larvae and western flower thrips pupae in the soil. Fungus gnat flies are black or gray in color with clear wings, relatively small (3-4 mm) in size and commonly associated with compost and natural soils with high organic contents.