The effect of pyrethroid lambdacyhalothrin applications on the spatial distribution of phytophagous and predatory mites in apple orchards

The spatial distribution of three phytophagous mites, Panonychus ulmi (Koch), Tetranychus urticae Koch and Aculus schlechtendali (Nalepa), and two predacious mites, Zetzellia mali (Ewing) and Amblyseius fallacis (German), and the effect of pyrethroid lambdacyhalothrin applications on mite spatial di...

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Bibliographic Details
Published in:Experimental & applied acarology 1992-10, Vol.15 (4), p.259-269
Main Authors: Li, S.Y. (Queen's Univ., Kingston, Ont. (Canada). Dept. of Biology), Harmsen, R, Thistlewood, H.M.A
Format: Article
Language:English
Subjects:
Acari
ACULUS SCHLECHTENDALI
AMBLYSEIUS FALLACIS
Biological and medical sciences
Chemical control
Control
DEPREDACION
Fundamental and applied biological sciences. Psychology
HUERTO FRUTAL
Invertebrates
MALUS
ONTARIO
ORCHARDS
PANONYCHUS ULMI
Phytopathology. Animal pests. Plant and forest protection
PIRETRINAS SINTETICAS
PREDATION
Protozoa. Invertebrates
PYRETHRINE DE SYNTHESE
SYNTHETIC PYRETHRINS
TETRANYCHUS URTICAE
VERGER
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Summary:The spatial distribution of three phytophagous mites, Panonychus ulmi (Koch), Tetranychus urticae Koch and Aculus schlechtendali (Nalepa), and two predacious mites, Zetzellia mali (Ewing) and Amblyseius fallacis (German), and the effect of pyrethroid lambdacyhalothrin applications on mite spatial dispersion were investigated over a 3-year period in an apple orchard in Ontario. Panonychus ulmi showed that between-tree spatial variation decreased with an increase of population densities, whereas between-leaf variation increased with population densities. With all other four species it appeared that between-tree variation is much greater than between-leaf variation at all field population density levels. The values of b by Taylor's power law suggested that all five species of mites are aggregated, but that in general P. ulmi and T. urticae (b = 1.427-1.872) are more aggregated than their predators (b = 1.254-1.393). Taylor's regression technique suggests that pyrethroid applications caused P. ulmi, T. urticae, Z. mali and A. fallacis to be less aggregated while A. schlechtendali was more aggregated.
ISSN:0168-8162
1572-9702
DOI:10.1007/bf01246567