Phytoseiid predatory mites can disperse entomopathogenic fungi to prey patches

Author:

Lin GongyuORCID,Guertin Claude,Di Paolo Sean-Anthony,Todorova Silvia,Brodeur Jacques

Abstract

AbstractRecent studies have shown that predatory mites used as biocontrol agents can be loaded with entomopathogenic fungal conidia to increase infection rates in pest populations. Under laboratory conditions, we determined the capacity of two phytoseiid mites, Amblyseius swirskii and Neoseiulus cucumeris to deliver the entomopathogenic fungus Beauveria bassiana to their prey, Frankliniella occidentalis. Predatory mites were loaded with conidia and released on plants that had been previously infested with first instar prey clustered on a bean leaf. We examined each plant section to characterize the spatial distribution of each interacting organism. Our results showed that A. swirskii delivered high numbers of conidia to thrips infested leaves, thereby increasing the proportion of thrips that came into contact with the fungus. The effect was larger when thrips infestation occurred on young leaves than on old leaves. Neoseiulus cucumeris delivered less conidia to the thrips infested leaves. These patterns result from differences in foraging activity between predatory mite species. Amblyseius swirskii stayed longer on plants, especially within thrips colonies, and had a stronger suppressing effect on thrips than N. cucumeris. Our study suggests that loading certain predatory mite species with fungal conidia can increase their capacity to suppress thrips populations by combining predation and dispersing pathogens.

Funder

Gouvernement du Canada | Natural Sciences and Engineering Research Council of Canada

Fonds de Recherche du Québec - Nature et Technologies

Anatis Bioprotection Inc. is a biological control company located in Saint-Jacques-de-Mineur, Québec, Canada.

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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