Natural enemies of mass-reared predatory mites (family Phytoseiidae) used for biological pest control.

Experimental & Applied Acarology
S Bjørnson

Abstract

Predatory mites of the family Phytoseiidae are valued natural enemies that provide effective pest control in greenhouses and on agricultural crops. Mass-reared phytoseiids are occasionally associated with microorganisms and although their effects are not always apparent, some are pathogenic and reduce host fitness. Invertebrate pathogens are encountered more frequently in mass production systems than in nature because rearing environments often cause overcrowding and other stresses that favour pathogen transmission and increase an individual's susceptibility to disease. Although unidentified microorganisms have been reported in phytoseiids, bacteria and microsporidia have been detected with considerable frequency. The bacterium Acaricomes phytoseiuli is associated with an accumulation of birefringent crystals in the legs of Phytoseiulus persimilis and infection reduces the fitness of this spider mite predator. Wolbachia, detected in Metaseiulus occidentalis and other phytoseiids, may cause cytoplasmic incompatibilities that affect fecundity. However, the effects of Rickettsiella phytoseiuli on P. persimilis are unknown. Microsporidia are spore-forming pathogens that infect Neoseiulus cucumeris, N. barkeri, M. occidentalis and P...Continue Reading

References

Jan 28, 1998·Annual Review of Entomology·G Poinar, R Poinar
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Citations

Jul 12, 2017·Bulletin of Entomological Research·L DingC Ran
May 20, 2017·Zeitschrift Für Naturforschung. C, a Journal of Biosciences·Thorben GrauGerrit Joop
Jul 9, 2020·Experimental & Applied Acarology·Jason C Sumner-KalkunM Alejandra Perotti
Aug 23, 2019·Anais Da Academia Brasileira De Ciências·João P P PaesRegiane C O F Bueno
Aug 28, 2020·Veterinary Pathology·Sushan HanYanyun Huang

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