FUNGUS GNAT PREDATORS FACT SHEET & Release Instructions
(Hypoaspis sp.)
Fungus Gnat Predators (Hypoaspis predatory soil mites) feed mostly on
the young larvae of fungus gnats but also on other small soil-dwelling
creatures including thrips, mites, and springtails, and when times get
really hard, they'll eat algae and plant debris. Predators typically
eat 1-5 prey per day. Just one release is usually enough to get them
started for season-long control.
Fungus gnat predators come mixed with a pasteurized peat mixture, in a
shaker-lid container. To apply, sprinkle some of the peat mixture over
the soil surface throughout the growing area. Be sure to treat wet,
exposed areas of soil where fungus gnats are likely to breed, including
greenhouse floors if necessary. For bedding plants it's not essential
to apply predators to every single flat , but apply early at a full rate
to allow time for predators to spread themselves out among the plants.
It's best to apply the predators as soon as they're received, but if
necessary they can be held at room temperature for limited periods.
Fungus gnats cause feeding damage to roots, root disease transmission,
and are a general nuisance when clouds of them fly around. Fungus gnat
predators work best when applied while fungus gnat populations are still
low, when 5000 predators treats up to 200 square feet of growing
surface. Larger pest populations will require larger releases for
effective control.
Predators can be seen with a 10-16X magnifier. Look for light tan
colored mites moving quickly on the soil surface and at the base of
plants. Males are much smaller than females, and are rarely seen. All
life stages occur in the top 1/2" of soil, capillary matting or
hydroponic media. Eggs hatch in about 2-3 days, and their life cycle is
completed in about 11 days at 68F. Fungus gnat predators thrive in
almost any conditions except for flooding. Temperature requirements are
not critical, although they'll become inactive at temperatures below 57F.
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