caa a22 4500 469061235 CHVBK 20180323132858.0 cr unu---uuuuu 170328e19921001xx s 000 0 eng 10.1007/BF01246567 doi (NATIONALLICENCE)springer-10.1007/BF01246567 The effect of pyrethroid lambdacyhalothrin applications on the spatial distribution of phytophagous and predatory mites in apple orchards [Elektronische Daten] [S. Li, R. Harmsen, H. Thistlewood] The spatial distribution of three phytophagous mites,Panonychus ulmi (Koch),Tetranychus urticae Koch andAculus schlechtendali (Nalepa), and two predacious mites,Zetzellia mali (Ewing) andAmblyseius fallacis (Garman), and the effect of pyrethroid lambdacyhalothrin applications on mite spatial dispersion were investigated over a 3-year period in an apple orchard in Ontario. The index of dispersion and the slope of Taylor's power law were used to evaluate dispersion patterns of mites. 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 ofb by Taylor's power law suggested that all five species of mites are aggregated, but that in generalP. ulmi andT. 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 causedP. ulmi, T. urticae, Z. mali andA. fallacis to be less aggregated whileA. schlechtendali was more aggregated. The impact of changes in mite spatial distribution following pyrethroid applications on sampling plans is discussed. Elsevier Science Publishers B. V, 1992 Li S. Biology Dept., Queen's University, Kingston, Ont., Canada aut Harmsen R. Biology Dept., Queen's University, Kingston, Ont., Canada aut Thistlewood H. Agriculture Canada, Vineland Research Station, Ont., Canada aut Experimental & Applied Acarology Kluwer Academic Publishers 15/4(1992-10-01), 259-269 0168-8162 15:4<259 1992 15 10493 https://doi.org/10.1007/BF01246567 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01246567 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li S. Biology Dept., Queen's University, Kingston, Ont., Canada aut NATIONALLICENCE 700 1- Harmsen R. Biology Dept., Queen's University, Kingston, Ont., Canada aut NATIONALLICENCE 700 1- Thistlewood H. Agriculture Canada, Vineland Research Station, Ont., Canada aut NATIONALLICENCE 773 0- Experimental & Applied Acarology Kluwer Academic Publishers 15/4(1992-10-01), 259-269 0168-8162 15:4<259 1992 15 10493 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer