FREE DELIVERY FOR ALL ORDERS OVER £50 (Excluding Bumblebee Colony Orders & Product Subscriptions)

Mighty Mite - Macrocheles robustulus


Use Mighty Mite Predators To Control A Variety Of Insect Pests

Mighty Mite contains the predatory mite; Macrocheles robustulus. This mite is a soil dwelling predator and feeds on insect larvae and other small insect pests that it locates in, or on, compost or soil. Professional growers use this predator as a routine treatment to keep young plants free from Sciarid Fly larvae, which can cause young plants, or seedlings, to die either from the sustained root damage or plant diseases spread by the Sciarid larvae.

Mighty Mite predators have been observed feeding on:

When Should I Use The Mighty Mites?

We advise using the Mighty Mites when Fungus Fly, or Thrip, have been identified on your plants, or ideally before they have infested your plants, but have been caught on your nearby sticky traps.

The Mighty Mites will control elements of the pest cycle that occur directly in the compost or soil, but will very rarely venture onto the plant itself. We would therefore encourage you to utilise sticky traps in combination with our predators to gain the best protection against pests in these areas. For catching adult Sciarid flies, hang up yellow sticky traps above the compost, or soil, to catch the adults, which will fly onto the traps when disturbed. See our range of sticky traps here to acquire this additional protection. 

Mighty Mite should especially be considered for use at the propagation of plants.

What Conditions Do The Mighty Mites Require?

Mighty Mites are suitable for use in moist conditions, both in greenhouses or on outdoor growing media. They will not tolerate standing water, however. For optimal results the soil should be moist (but not too wet), and preferably rich in organic matter. If wishing to boost your soil with the necessary organic matter, see our Soil Boost Fertiliser.

The minimum temperature for optimum use of Mighty Mites is 15℃.

How Many Mighty Mites Do I Need?

Dragonfli offers you this useful biological control weapon in bottles containing either 5000, 10,000, 25,000 or 50,000 predators per bottle. 

One bottle of Mighty Mite 5000 can treat up to 20m2 of surface area.

How Do I Apply The Mighty Mites?

Mighty Mites are supplied in a bottle of vermiculite, which acts as a carrier for the mites and permits easy application amidst the soil and base of your plants. Simply turn and gently rotate the bottle when evenly spreading the predators on the compost or soil around the base of the plant stemMighty Mites are not observed on plants after application as they are soil dwelling mites.

Full application instructions are provided on delivery.

When Will I Need To Replace The Predators?

The predators will begin consuming the pests immediately and, providing the conditions are optimal, will continue to feed and reproduce until the infestation is controlled. If you cannot see that pest numbers are reducing after around 7 days, you may need to apply more predators to completely eradicate the infestation.

Combine Application Of Mighty Mites With More Dragonfli Predators For Better Protection Against Thrips

Mighty Mites primarily focus on feeding the egg and larval stages of Fungus/Sciarid Flies. It will also attack Thrips pupae in the soil, but cannot be relied upon alone for Thrip control. Mighty Mites do, however, enhance biological control when used in conjunction with other predators feeding on Thrips directly on plant foliage. See our dedicated page of Thrip predators here and select which predators suit your specific infestation needs. 

See Also Our Fungus Fly Killer Nematodes For Complete Control Over Fungus Gnats

Fungus Fly Killer Nematodes will enter the larvae of Fungus Fly via a natural opening, like the mouth, and feed on the contents of the larvae. A natural bacterium is produced by the nematodes inside the larvae, which kills it. Infected larvae will be completely broken down by the nematodes. The nematodes also reproduce inside the larvae, releasing more nematodes into the surrounding area. 

Utilise these nematodes in combination with your Mighty Mites for the complete protection against Fungus Fly infestation. The Fungus Fly Killer Nematodes product listing can be found here.

Chemical Pesticides

Mighty Mites are living creatures and can be affected by any chemical pesticides used within the previous few weeks. As a general guide, refrain from using Natural Pyrethrum or SB Plant Invigorator 2 days prior to use. Other chemical insecticides can have long lasting residues that could harm the Mighty Mites and other predatory mites for much longer periods. Refrain from using these products or check with Dragonfli for information on the effect of these products on the predatory mites.

Allergy Information 

Just as you can be allergic to cats, pollen, and dust mites, it is also possible to be allergic to the natural substances in predatory mites, feeder mites, and supplementary feeding products. If you are not allergic, but come into close and prolonged contact with certain substances, you could still develop an allergy.

Click here for advice on on the precautionary measures you can take to prevent or reduce any allergic reactions caused by the type of products mentioned above.

Customer Reviews

Based on 2 reviews Write a review

Customer Reviews

Based on 6 reviews
Kenneth Hewitt
Scarid Fly Control

Most of my dwarf beans in 10 lt. pots in the greenhouse were going yellow. after close examination, tiny maggots were attacking the plant stems. After a week of treating with Mighty Mite and Hypoaspis sp, the plants all recovered and I now have a good crop.

Delroy Ashun
The mighty mites

Soon they settled in I have not seen one bit of a problem first class

Nature vs Nature!

There is always a natural way to deal with nature instead of man-made chemicals. This is one of them for these annoying fungus/gnat flies.

I highly recommend this product.


These mites arrived raring to go. A few days after spreading them I noticed a significant decrease in the number of fungus gnats flying about.


Still have bug problems even after multiple applications