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Fallacis, a most formidable predatory mite

Published on: | Created by: Roxanne S. Bernard

Tags: fallacis, spruce spider mites, two-spotted spider mites

Neoseiulus fallacis, the predatory mite that eats two-spotted spider mites

What if you could introduce a predatory mite that would get established in the field, be able to withstand the cold winters and control pests for several years? Now you can with Neoseiulus fallacis, named the most formidable predatory mite on the market according to Les insectes d’intérêt agricole, 2017.


Neoseiulus fallacis : Established Canadian production

Portrait of Alejandra HilaronAlejandra Hilarion, who holds a Master’s degree in Biology from the Nueva Granada Military University in Columbia, is our predatory mite production specialist at Anatis Bioprotection. She raises N. fallacis on young bean plants infested with two-spotted spider mites (Tetranychus urticae). Every week, Alejandra counts the spider mites and N. fallacis present. The bean leaves with an optimal predator/prey ratio are selected for shipping across Canada.





Fallacis : A remarkable, resistant predator

Selected by Dr. Noubar Bostanian and his team from Agriculture Canada in Saint-Jean-sur-Richelieu, N. fallacis has demonstrated resistance to several pesticides commonly used in agriculture. Fields tests have shown that N. fallacis

  • has excellent dispersal abilities
  • can withstand the cold and heat (active between 9 °C and 32 °C)
  • can survive when pest populations drop to low levels

These characteristics make it an excellent spring or fall preventive.

Fallacis eating two spotted miteNeoseiulus fallacis is used as a frontline agent in integrated pest control programs targeting two-spotted spider mites, McDaniel spider mites (Tetranychus mcdanieli) and tarsonmids in the field (on strawberry plants, apple trees and grapevines). It is also proven effective in controlling spruce spider mites (Oligonychus ununguis) and European red mites (Panonychus ulmi) on spruce and cedar trees and in arrowwood trees and shrubs in nurseries.


Introduction in the field

Before introducing N. fallacis, we recommend scouting to detect the presence of pests and the size of their populations

Neoseiulus fallacis can be introduced in the field as soon as temperature reach 9 °C. For new plantations, we recommend introducing 25,000 N. fallacis per hectare. In the second year of production, you can reduce this to 17,000 N. fallacis per hectare. For even coverage, you will need 60 to 80 introduction points. The bean leaves must be placed in the upper third of the foliage at the end of the day so the mites have a little humidity. For better dispersal, place more introduction points on the side that gets the most wind.

On leaves or vermiculite?

Container of fallacis on leaves

Anatis Bioprotection, in partnership with Canadian company Applied Bio-nomics, offers two ways to introduce N. fallacis : on bean leaves or on vermiculite.

Neoseiulus fallacison bean leaves contains the predatory mite in all stages of development (eggs, juveniles and adults) with a small quantity of two-spotted spider mites as a source of food (does not cause secondary infestation). This product is Anatis’ specialty and has the advantage of being twice as effective.

The second format only contains adult predatory mites in a vermiculite substrate. This format is preferred for ornamental crops since, due to the humidity in certain plant lots, the bean leaves can stain your foliage.

How to use Neoseiulus fallacis (video in French)




See the Neoseiulus (Amblyseius) fallacis sheet