Amblyseius fallacis: a promising predatory mite for cooler crops

Biobest is proud to introduce its Fallacis-System (A. fallacis) as a very effective predatory mite in the struggle against two spotted spider mite (TSSP, Tetranychus urticae), European red mite (Panonychus ulmi) and other spider mites, rust mites and small invertebrae. A. Fallacis combines:

  • high tolerance to cooler temperatures
  • high mobility between plants
  • high resistance to pesticides
  • high reproduction rate in colder climates 

The 'cool' mite

Predatory mites are known to be very effective against T. urticae and other pests in different crops, especially under warm greenhouse conditions. Under cooler conditions, things start getting troublesome.

Enter Amblyseius fallacis. This new contender will stay active and will reproduce, even at lower temperatures (18-22 °C). This makes it a very useful biological agent in difficult crops such as strawberries and ornamental rose crops. Under these conditions, A. fallacis is more active and reproduces faster than any other commercial mites. 

Seek and destroy

A.fallacis is a very voracious predator, consuming up to 16 spider mites a day. Its relatively long legs make it very mobile. A.fallacis shows two different foraging patterns. When prey is plentiful, they use a random walking pattern which helps them to clear the individual leaves. If prey is scarce, they will walk on the edges of the leaves, which help them to cross over to other leaves and plants. Under windy conditions, A. fallacis will even move to the top of the plants to be blown-off to other regions of the crop.

Preventative introduction

A. fallacis is a food generalist, with a strong preference for other spider mites. When their favorite meal is not available, fallacis will prey on other mites and small invertebrates. Furthermore, A. fallacis can perfectly survive on pollen. This allows growers to introduce the biocontrol agent even at low spider mite populations. In certain crops, it is even possible to maintain a year-round presence of fallacis.

Integrated crop management

Amblyseius fallacis has shown to have a relatively low susceptibility to a number of chemical crop protection products. This resistance will vary strongly with the techniques used, temperatures, timing and the nature of the chemical agent. As always, we refer to your Biobest-representative for advice on your integrated crop management scheme.

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