title: Prey-stage preferences and functional and numerical responses of Amblyseius largoensis (Acari: Phytoseiidae) to Raoiella indica (Acari: Tenuipalpidae).
abstract: Raoiella indica Hirst (Acari: Tenuipalpidae) is a phytophagous mite that recently invaded the Western Hemisphere. This mite is a multivoltine and gregarious species that can reach very high population densities and cause significant damage to various palm species (Arecaceae). The predatory mite Amblyseius largoensis (Muma) (Acari: Phytoseiidae) has been found associated with R. indica in Florida. This study evaluated A. largoensis for potential to control R. indica by (1) determining predator preferences among developmental stages of R. indica, and (2) estimating predator functional and numerical responses to varying densities of its most preferred prey-stage. Under no-choice conditions A. largoensis consumed significantly more eggs than other stages of R. indica. In choice tests A. largoensis showed a significant preference for R. indica eggs over all other prey stages. Amblyseius largoensis displayed a type II functional response showing an increase in number of prey killed with an increase in prey population density. Consumption of prey stabilized at approximately 45 eggs/day, the level at which oviposition by the predator was maximized (2.36 ± 0.11 eggs/day; mean ± SEM). Results of this study suggest that A. largoensis can play a role in controlling R. indica populations, particularly when prey densities are low.
authors.affiliation: Department of Entomology and Nematology, Tropical Research and Education Center, University of Florida, Homestead, FL 33031, USA. dancar@ufl.edu
authors.forename: Daniel
authors.initials: D
authors.lastname: Carrillo
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Peña
mesh_terms: D000818:Animals; D005260:Female; D005518:Food Preferences; D007814:Larva; D008925:Mites; D009758:Nymph; D010063:Ovum; D010572:Pest Control, Biological; D011156:Population Density; D011235:Predatory Behavior