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Hypoaspis miles

Predatory Mite of Fungus Gnats

Identification and Biology : Hypoaspis is a small ( 1 mm) predator mite that lives in the top layer of the soil.   It  is especially fond of dark, damp places and is not highly tolerant of dry conditions.  Hypoaspis has a long lifespan -3 to 4 months- and can survive 3 to 4 weeks without food.   There is no population growth at 10°C.  At 32°C the level of egg mortality is very high and females that develop from such eggs are barely capable of laying eggs.

Mode of action: Hypoaspis feeds on soil-inhabiting stages of different insects and mites.

Introduction method and release rates: Mix the peat well before introducing the predatory mites.  Apply the peat evenly on the soil or in little piles on the sawdust.  The soil or sawdust must be moist, but not too wet.  Preventative 100/m2 in ornamental crops and 30-100/m2 in vegetables.  Curative 250-500/m2 in ornamentals.  It takes several weeks (depending on introduction rates ) till Hypoaspis is established in the soil.  It is therefore important to introduce Hypoaspis at the beginning of the crop.  If the population of fungus gnat is too high when Hypoaspis is introduced, the use of sticky cards and nematodes will help to decrease the number of the pest.

Storage: Introduce the beneficials as soon as possible after receipt. If storage is necessary, keep them at 12 – 15 °C (54 – 59 °F).