Phytoseiulus persimilis - Spider Mite Curative System


Phytoseiulus persimilis is a predatory mite used to kill two spotted mite (Tetranychus urticae) often known as red spider mite. It is used to tackle severe infestations and treat spider mite hotspots.

Phytoseiulus predatory mites are the most commonly used form of biological pest control against red spider mite / two spotted mite in greenhouses and protected growing environments. These predatory mites feed on all stages of the spider mite life cycle from egg to adult. Their life cycle is faster than the mites they are feeding on and in suitable conditions they can double their population every two days, consuming around 5 adults and 20 young larvae per day. This leads to a quick reduction in the spider mite population and plant damage.

When spider mite is present in large numbers, we advise using Phytoseiulus with the predator Amblyseius californicus for best results. 

Severe spider mite infestations may need more than one curative application of predators. Allow 7-10 days and reapply if spider mite is still visibly present. 

Please ensure you have read the appropriate conditions for using Phytoseiulus before purchase, these can be found below.

When should I use Phytoseiulus?

Use Phytoseiulus as a curative measure when spider mite is present on the plant, leaf damage and webbing is a clear indication of this. DO NOT apply if you have used any chemical treatments in the past 2 weeks.

What conditions do Phytoseiulus need to be effective?

Temperature ranges between 15-28 degrees are ideal for Phytoseiulus to be most effective. The predators like slightly higher levels of humidity than the pest spider mites, a relative humidity of around 75% is ideal. If conditions are too dry, predators will begin to move to the bottom of the plant seeking moisture.

How many do I need?

Based on an average plant 1m in height. We recommend the following application rate;

100 Phytoseiulus per plant

For severe infestations, where leaves show signs of webbing and yellow splotches. We advise doubling this rate and applying a second application 7-10 days after the first.

Use Phytoseiulus together with loose Amblyseius californicus for best results.

Standard or Concentrate formulation?

Dragonfli supply the standard 2000 unit in a 0.5 litre bottle of vermiculite or a unit of 2000 in in a 30 mil vial, which is the concentrate version. Choose the cocentrate version if you wish to apply a high number of predators over a small area , where a high number of predators is required. If treating over larger areas or a larger number of plants, we would suggest the standard 2000 version in the 0.5 litre bottle.

How do I apply?

Spider mite often feed at the top of plants, so ensure predators are released in this area or in hot spots of activity. Supplied in shaker bottles you can apply the predators by rotating the bottle and gently shaking the contents directly onto the infested leaves of the plants. Phytoseilius can also be applied using distribution boxes which act as small breeding sites for the predators and can be hung onto stems or leaves. Full instructions are provided on delivery.

Can I store Phytoseiulus?

We advise using Phytoseiulus straight away upon delivery, this ensures best results as the mites will be fresh.

Chemical Pesticides

Phytoseilius is a living creature and can be affected by any chemical pesticides used within the previous few weeks. As a guide cease using pyrethrum or SB plant invigorator 2 days prior to use and other persistent chemicals or universal bug killers 1-2 weeks before using Phytoseilius.

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