2,301 research outputs found
Melatonin treatment and light therapy for chronic sleep onset insomnia in children:Effects on sleep, cognition, health, and psychosocial functioning
Pest species diversity enhances control of spider mites and whiteflies by a generalist phytoseiid predator
To test the hypothesis that pest species diversity enhances biological pest control with generalist predators, we studied the dynamics of three major pest species on greenhouse cucumber: Western flower thrips, Frankliniella occidentalis (Pergande), greenhouse whitefly, Trialeurodes vaporariorum (Westwood), and two-spotted spider mites, Tetranychus urticae Koch in combination with the predator species Amblyseius swirskii Athias-Henriot. When spider mites infested plants prior to predator release, predatory mites were not capable of controlling spider mite populations in the absence of other pest species. A laboratory experiment showed that predators were hindered by the webbing of spider mites. In a greenhouse experiment, spider mite leaf damage was lower in the presence of thrips and predators than in the presence of whiteflies and predators, but damage was lowest in the presence of thrips, whiteflies and predators. Whitefly control was also improved in the presence of thrips. The lower levels of spider mite leaf damage probably resulted from (1) a strong numerical response of the predator (up to 50 times higher densities) when a second and third pest species were present in addition to spider mites, and (2) from A. swirskii attacking mobile spider mite stages outside or near the edges of the spider mite webbing. Interactions of spider mites with thrips and whiteflies might also result in suppression of spider mites. However, when predators were released prior to spider mite infestations in the absence of other pest species, but with pollen as food for the predators, we found increased suppression of spider mites with increased numbers of predators released, confirming the role of predators in spider mite control. Thus, our study provides evidence that diversity of pest species can enhance biological control through increased predator densitie
A temporal escape of one of two pest species from control by Amblyseius swirskii, when a second prey is present
Wanneer twee soorten plaaginsecten aanwezig zijn in de kas, kan één van beide soorten ontsnappen aan de predator die als biologische bestrijding is uitgezet. Dit is aangetoond in een proef met Amblyseius swirskii. Na enkele weken werd het effect tenietgedaan door de toename van het aantal predatoren
Biological control of thrips and whiteflies by a shared predator: Two pests are better than one
Systematic Parameter Reviews in Cognitive Modeling: Towards a Robust and Cumulative Characterization of Psychological Processes in the Diffusion Decision Model
Systematic Parameter Reviews in Cognitive Modeling: Towards a Robust and Cumulative Characterization of Psychological Processes in the Diffusion Decision Model
Pest species diversity enhances control of spider mites and whiteflies by a generalist phytoseiid predator
Effects of melatonin and bright light treatment in childhood chronic sleep onset insomnia with late melatonin onset: A randomised controlled study
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